After hundreds of heat cycles, the o-ring cooks itself and. My system added almost a quart to the total oil capacity, which can only be helpful. This will cause the coolant and oil to mix and should be immediately repaired. As you might expect, the biggest problem that oil cooler lines face is leaking. First, there is an. The average cost for a Honda Civic trans oil cooler line replacement is between $102 and $123. All three GM trucks I've owned have had, or have, leaks in oil cooler or trans cooler lines. It starts as a drip, and can drip on the driveway. The cooler lines are VERY common but at the rubber portion at the compression. First I thought it's the connection of the left plastic tank to the core but it is the upper engine oil cooler hose connection. Seen above is the oil cooler line leaking, located just ahead of the oil filter housing. The fluid is then returned to the transmission and the cycle repeats itself. Either clogs or leaks will make the oil cooler less effective at cooling the transmission fluid. Hand Tools (439) Repair Supplies Metal Radiator Tanks and Parts (121) Oil Coolers (60. Filter new, - Answered by a verified Chevy Mechanic. The only oil lines there lead to the transmission and cooler. At the first sign of a transmission leak, remember Bar's Leaks - we've been in the automotive leak business for over 70 years, including OEM and military applications. It is, in fact, a common issue with many of the BlueTEC diesel Mercedes’ but if you’re Read More >. Do you have oil lines that go into your radiator? I do not on my truck. This video shows how to fix minor oil leaks in a 2007 Chevrolet HHR LT 2. i dont see any leaks. Has anyone done transmission cooler lines on a 2007 chevy silverado 1500 classic? I purchased new lines they go to radiatorfrom transmission. There haven't been any reports of a leaking oil cooler, so I think you have the right idea - replace the filter and clean up the leaked oil, then watch to see if you still have a leak. As with water-cooling systems, there is a danger of the oil being over-cooled if it is allowed to flow through the radiator all the time. oil level is fine. Is this normal? Also, what is the best way to rerout the lines. Flowchart for Checking Coolant System for Pressure Leaks. The cooler lines are easily damaged or bent, which will restrict the flow of fluid. Do you have oil lines that go into your radiator? I do not on my truck. The next few articles will cover the different types of “Quick Connects” used by original equipment manufacturers to attach transmission and engine oil cooler lines to the heat exchangers in the power train cooling system. Started noticing a drip of oil a few weeks ago, 1 drip at a time under the truckoil leaks drive me crazyso I go under for a look. Edit: Based on quick research, it seems that 30 - 50 psi should be the maximum pressure typically seen in the transmission oil cooler lines. 00 for the part. 10) Detach the oil cooler lines by detaching the ¾” fittings from the old radiator, and using a 20mm wrench and a 15/16 wrench, detach the other end of the lines from the oil cooler adapter. Oil leak showing at cooler line block at filter and on filter. It is item #11 below. My oil cooler lines have been leaking for quite a while now. Easy to use parts catalog. Seems that something is leaking oil into my radiator water. Unplug the wire going to the Green Switch. It ended up being the coolant hoses at either end of the radiator to start with. Leaking Oil. I've seen in other forums to remove the front dr. If it is a seam thats leaking it will continue to crack. Seen above is the oil cooler line leaking, located just ahead of the oil filter housing. I have read a lot of 14 and new 3. What are possible sources of oil leak?. Leaking engine or auxiliary oil cooler. Maki, Editor. STEP 10: Install the new lower radiator hose onto the upper housing and release the hose clamp. How does one go about getting a pro. Find FORD Automatic Transmission Cooler Lines and get Free Shipping on Orders Over $99 at Summit Racing!. If the leak is confirmed as the o-ring, make sure the 27mm nut holding the cooler in place is tight. Question = Oil cooler lines leaking at fittings. Remove air cleaner assembly. They are made as cheaply as possible. An internal engine coolant leak may happen because of a cracked water jacket, cracked cylinder block or head, blown head gasket, a damaged transmission oil cooler line on automatic transmissions, or a leaking intake manifold gasket on V-type engines. I called Tasca and my local dealership and they are giving me opposite information. Mine were sweating oil. Losing coolant in my 2002 Pete 387 Cat C-15 6NZ with 975k miles on it. You are now done. The B&M cooler can only lower the oil temperature by 20 degrees +/-. Don't use your old oil cooler fittings on this radiator. Thermostats. dose anyone know how to reapair or cost to repair this for a 05 impala. They are not an air cooled radiator type, but a heat exchanger using engine coolant to cool the oil. all reassembled the turbo is still leaking , although nowhere NEAR as badly. The leak seems to be coming from the larger octagon shaped flange that goes around it. Best Answer: If both line fittings are leaking where they go into trans. need to alos make sure it did not crack at the trans cooler, or coolant can mix with trans fluid and ruin trans too. ( I think??). Leaking air intake after cooler (intake air heater in some cases). 2 EGR Cooler Leak Test. 14 Answers. JEGS carries the industry's largest selection of oil coolers. Look at where the lines connect to the radiator and see if there is signs of the leak. This kit includes lines that are made of Teflon and Stainless Steel braid for a long lasting system. For anyone who reads this thread and has the same coolant leak filling the valley of the engine and also running down the front of the engine beside the coolant pump don't look at the EGR cooler as the issue!! It is the vacuum controlled coolant valve leaking that is mounted under the EGR valve behind the oil cooler under the HP pump. You can pay a mechanic 4 hours labor ($350 - $400) or do it yourself. I have a 1998 C70 Coupe, with the 2. The centrifugal-type water pump circulates the engine coolant through the cylinder block, cylinder head, radiator and the oil cooler. How to repair a leaking oil cooler So, I’m changing my oil the other day and I see coolant dripping from the oil cooler. Just like a combustion leak into the cooling system, a blown head gasket, cracked head or block, or faulty oil cooler lines can cause coolant to leak into the engine oil. I want to know what I did. Technically the transmission cooler in the radiator could crack and leak trans fluid into the radiator coolent. TDI= oil cooled only. 00 on average. I checked for tightness and all was good so I looked at the non leaking side. I have a leak in the engine oil cooling line. I have a leak, of what looks like oil that is coming from the passenger side high pressure hose that goes to the radiator. Mine were sweating oil. High performance applications like towing and high torque engines can build heat in the transmission and break down fluids. Iv'e been having a small leak from the tranny oil cooler at the front of the truck ('06 V6 xlt). It'd also be a good time to clean up the oil mess while you have the access in there. Apparently, the fan shroud vibrated enough to rub a hole through the lower aluminum oil line where it is threaded into the radiator. Order Chevrolet Silverado 2500 HD Auto Trans Oil Cooler Line Fitting online today. For the 10 minutes it took to test the oil cooler circuit it was worth the peace of mind. This will cause the coolant and oil to mix and should be immediately repaired. I just had the same problem. It looks like you caught it early. the lines attach to the radiator with fittings make sure the new lines have the o rings on them no need to use Teflon tape as the threads do not seal only the o ring does. Do I need to replace oil lines or is there another fix. Estimate does not include taxes and fees. Upon a final inspection before removing the cooler lines, I encountered two issues. As for a 2F, do the side cover gasket first. Well after looking on GM parts direct website that is in fact a power steering oil cooler. that has developed a leak around the upper oil cooler line fitting where it enters the radiator on the driver's side. Mine were sweating oil. I left the coolant hoses attached until after detaching the cooler from the engine block. Pulled truck in garage and it sat for two days. There is no seal that can be replace to cure this due to the fact that the cooler is a sealed unit and no way for coolant and oil to mix unless damaged. I was watching your video Oil in Coolant and I have just the oppisite, Coolant in my oil and no sign’s of any oil in coolant. I clamped them off to prevent leaking when removed from the cooler barbs. The fittings on my custom aluminum radiator started leaking so I said to hell with it and cut the steel lines and re routed and bypassed the radiator. I have a 1994 K2500 truck which has a coolant leak where one engine oil cooler line connects to the radiator. 2000 B5 ATW, the lower hose on the oil cooler- the one towards the oil filter, is leaking coolant slowly, like a coffee cup every thousand-some miles, just where the hose attaches to the oil cooler flange. Were leaks found? Yes, leaks are found. Engine coolant leaking from oil cooler. Cadillac 03 Cts Valve Cover Gasket And Intake Manifold Removal Oil. Estimate does not include taxes and fees. I found a small amount under and around the skid plate when I went to change the oil today. Finding Oil Leaks. They want $800 to replace them. Oil Leak Repair at Firestone Complete Auto Care Our expert service professionals will perform a visual inspection in an effort to diagnose where (and why) your car is leaking oil. The oil is cooled, then cycled back to the transmission through an outlet hose. It is, in fact, a common issue with many of the BlueTEC diesel Mercedes’ but if you’re Read More >. How to go about sealing coolant leak from cooling lines on radiator? Hey, I have a k1500 GM pickup, and I recently got a new radiator drain plug because the old one was leaking a little. Filled it up with coolant and ran it for a while to see if i could find the leak. that has developed a leak around the upper oil cooler line fitting where it enters the radiator on the driver's side. The next thing that you may notice when it is time to replace your oil cooler line is oil leaking around the fittings of the hose. Last week I took my bitdi in as it was using or leaking water too often. Oil cooler hose leak repair. After about 10 minutes, it started dumping coolant from what I can see from the rear drivers side of the engine. This won’t include any repairs, just a diagnosis; however, if you were to use mechanic or dealer for the repair, the diagnosis fee will be applied to the final invoice. I removed them pretty much by touch once I could turn the oil cooler around to get access. If you are leaking engine coolant there, & that is not a threaded pipe fitting, or a machined threaded bung with an. Cody's Transmission Cooling line leak at the Radiator Connection S10 Radiator Change - Duration: 1998 Chevy Tahoe Suburban Common Oil Leak FIX. Did GM change the thread size or type? The fittings are the same physical size but won't thread. Hello everyone Hope all is well. That is where the Mustang transmission cooler lines come into play! Ford Mustang transmission cooler lines are those sturdy, metal lines that connect your muscle car's transmission to the radiator. This weekend was supposed to be the big job, tomorrow actually. Because the coolant leak is on top it appears to be a phantom leak. Your leakage may be at the quick connect seal between the line and the connector on the radiator (rather than between the connector and the radiator). I think it's coming from where the fluid line goes into the fitting, and not from where the fitting goes into the cooler. I bought a set of replacement lines from Year One, I had to cut both lines in two near the oil pan. The pump is mounted on the front of the engine gear case cover on units built prior to 6R037024 and is driven by the water pump drive gear. I repaired my oil cooler lines. You should not be finding any engine oil leaks anywhere around the radiator. We will need to secure the cooler lines a bit lower to pass around the side of the radiator - I moved the lines to just below the black plastic factory clip, and zip tied them snugly (but not too tight) to the subframe rail. Oil Leaks: I have come across a few oil leaks coming from the front cover area because of the loosening of the vacuum pump bolts. At the first sign of a transmission leak, remember Bar's Leaks - we've been in the automotive leak business for over 70 years, including OEM and military applications. High performance applications like towing and high torque engines can build heat in the transmission and break down fluids. All these items must be removed before the oil cooler can be removed. North American Clubhouses - Central Region CA. The next few articles will cover the different types of "Quick Connects" used by original equipment manufacturers to attach transmission and engine oil cooler lines to the heat exchangers in the power train cooling system. Locate the transmission cooler hard lines that run into the radiator and inspect them for leaks. The next few articles will cover the different types of “Quick Connects” used by original equipment manufacturers to attach transmission and engine oil cooler lines to the heat exchangers in the power train cooling system. The cooled oil flows back into the hot object to cool it continuously. Leave it a little loose so you can connect the oil and coolant lines more easily. You can visually check the oil cooler lines for cracks and leaks. Through a lot of research I've read some people that just delete these lines especially for those that don't tow very much or work their truck very hard which is pretty much me. The leak at oil cooler in my LS2 was fixed in April in accordance with this TSB. Whether the coolant leak is large or small, you will eventually overheat the engine if it isn't repaired quickly. This hose runs from the individual parts to the radiator in the front of the engine compartment. See all problems of the 2004 Chevrolet Trailblazer. Unless the TSB has changed since then,there is no formed type gasket involved. It's tricky to get the trans cooler lines seated just right. 2L/379 Dorman Oil Cooler Lines and get Free Shipping on Orders Over $99 at Summit Racing!. I went for a oil change, an i was told i had a transmission cooler line leak. The vehicle repaired in this video is a 1998 Chevy 1500 Silverado with a 5. It is probably the second most important thing after the engine because if the transmission isn't working right, then the vehicle can not be driven. Look at where the lines connect to the radiator and see if there is signs of the leak. As you might expect, the biggest problem that oil cooler lines face is leaking. Start: Some GMC Jimmys and Chevy Blazers have an engine oil cooler. Some cooling systems use a radiator cap that seals the opening in the top tank or overflow tank and. View attachment 97714 [o Ok I have done some more looking and I am maybe even more confused. When it was time for the oil change and I was underneath for that; I plainly saw that the transmission fluid leak was thankfully just the fitting. It is always best to place the auxiliary cooler inline with, and after the existing radiator cooler. They said that the transmission line wasn't tight on radiator which caused the leak. Use the one that come with the radiator. I ended up getting a great deal on a radiator that didnt have hookups for the cooler lines. STEP 10: Install the new lower radiator hose onto the upper housing and release the hose clamp. Route hoses to cooler being very careful not to run them near anything they could rub against over time and eventually cause a leak. one for oils and another for antifreeze. Remove the upper transmission oil cooler NOTE: THIS TSB DOES NOT APPLY TO fitting. Leaking engine cylinder head gasket: Coolant passes into the cylinders or the crankcase. The next thing that you may notice when it is time to replace your oil cooler line is oil leaking around the fittings of the hose. Often, you can tell coolant has leaked into the lubricating system by the appearance of a milky white substance on the dipstick or under the valve covers. It is always best to place the auxiliary cooler inline with, and after the existing radiator cooler. Oil leak showing at cooler line block at filter and on filter. Application - 1983-1995 Mustang. I'll have to call the radiator shop on monday, but possibly they could take the oil cooler fittings from original radiator or that entire heat exchanger and put that in new radiator. ive done a couple of searches and most of them were from a bad brands of oil filter. my radiator started leaking. Do not use fuel line. Free Same Day Store Pickup. Vehicles without a dedicated oil cooler might have oil cooling tubes integrated into the radiator. Getting the fans out is the hardest part of this job, note there is a hidden 8mm bolt on the bottom of the fans supporting the transmission lines: New lines installed. I can't get the oil cooler lines to thread into the new radiator. A Oil Cooler Lines Replacement costs between $0. The transmission oil/power steering cooler assemblly is equipped with quick connect fitting for the transmission oil and power steering lines. Another thought, the car had a new radiator and water pump installed before I got it, is it possible that the oil cooler lines were already loose, and by changing oil filter and moving those dangling lines back forth made them looser and caused the leak? It wasn't leaking before the oil change, and that bothers me. Audi a4 coolant leak behind engine. mercedessource Tech help - Failure of these hoses can lead to total destruction of your engine Along with radiator neck failure, the rupture of one of the large oil cooler lines on your diesel engine can easily ruin your engine. The Dorman 624-896 Transmission Oil Cooler Line for your 2003-2005 GM 6. There is a plastic bushing that is pressed in AFTER the factory puts the o ring in it. The leak seems to be coming from the larger octagon shaped flange that goes around it. My 2010 Highlander started leaking oil while driving. External oil coolers are available to reduce operating temperatures when the above conditions are encountered. Remove the intercooler and pressure test it underwater. At the time I was leaking fluid I was unsure really to what exactly was leaking. Drove off the lot, did a 30 mile trip and it was fine. To do this remove the turbo air tubes etc, the top radiator hose and the rad over flow line. You can pay a mechanic 4 hours labor ($350 - $400) or do it yourself. My 2010 Highlander started leaking oil while driving. All these items must be removed before the oil cooler can be removed. Means you have a leak between the oil system and the cooling system. If your car is leaking coolant, it will run normally until the coolant level gets too low. So you'll re-route this line into the cooler, and route a new line from the cooler back to this hard line. As I stated earlier, the radiator oil cooler doesn't hold much fluid. Oil Coolers. They sometime blow the gasket or sometimes when so get trans work done if a longer bolt is installed around this it will hit it and make it leak. heater hose and a reducer because the two lines going to the cooler are two different sizes, so I just ran a new hose from the bottom of the wp to the bottom of the radiator. (I was a Amsoil dealer for a few years) Amsoil 'reccomends' it but its not approved. In most cases, this leak is small enough that you can add coolant until a replacement radiator can be obtained. My guess was the coolant caused the belt to slip. As ponymare stated, your radiator has a built-in oil cooler section, with two small steel lines attached at the base of the radiator coming/going to the engine. need to alos make sure it did not crack at the trans cooler, or coolant can mix with trans fluid and ruin trans too. Get transmission cooler line and make sure it is the right size. 1983-1995 Mustang Cooler Line Connector Repair your Mustang’s leaking transmission cooler lines with the following connectors and repair kits. It is leaking where the cooling line goes into the top of the radiator. 4L engine in my 1999 Tahoe w/ a 5. In cold weather the in tank radiator TOC acts as an oil warmer so it very important that the flow direction has the fluid going through the radiator first before traveling to the external cooler. If this is the case, the shop which worked on your vehicle should. Similar to a loss of oil, an external oil cooler failure may force all of the engine coolant out of the engine. Broadcast Message 0287. If you have both an engine oil and trans cooler built into the radiator, an internal leak in the radiator between coolant and oil will mix the two, but it's the less likely cause. The only oil lines there lead to the transmission and cooler. I got pressure drop about 1 psi every 4ish minutes so their has gotta be a leak somewhere but the reservoir level stayed the same. The oil cooler fitting had a crack and would never seal. The rubber hoses are antifreeze lines. So I have a 2014 Dodge charger se 3. since the trans cooler is a. Were leaks found? Yes, leaks are found. The oil leak is probably due to a poor seal on the filter. Leaking oil is never a good sign. It has nothing to do with yhe oil and coolant from mixing. vehicle for this. need to alos make sure it did not crack at the trans cooler, or coolant can mix with trans fluid and ruin trans too. Oil Coolers. mercedessource Tech help - Failure of these hoses can lead to total destruction of your engine Along with radiator neck failure, the rupture of one of the large oil cooler lines on your diesel engine can easily ruin your engine. The transmission cooler is a heat exchanger that allows heat in the transmission flud to be trans- ferred to the air passing over the cooler fins. While the radiator is draining, remove all hoses from the radiator by loosening their clamps. 9) Detach the transmission fluid lines near the upper radiator hose leaving the proper connectors in place to reattach your external transmission cooler. If the Engine Oil Leak is bad enough it can make the belts screech. As you might expect, the biggest problem that oil cooler lines face is leaking. transmission oil flows. If coolant is present, the EGR coolers need to be removed and bench tested. It is probably the second most important thing after the engine because if the transmission isn’t working right, then the vehicle can not be driven. I was under my truck this weekend to fix a power steering line leak and noticed the transmission cooler line was wet, its not dripping fluid or anything its just wet and its definitely coming from that line. since the trans cooler is a. Our Audi experts can diagnose the fault and repair it using factory genuine Audi parts. There are two seals at this radiator connection. A week ago my transmission cooler lines broke and I did not notice this till I was about 20 miles from the house and luckily the Toyota dealership was within a walking distance. If this is so it will mean a replacement radiator/oil cooler assembly. Remove the two coolant hoses from the hard lines. the lines attach to the radiator with fittings make sure the new lines have the o rings on them no need to use Teflon tape as the threads do not seal only the o ring does. You should not be finding any engine oil leaks anywhere around the radiator. Seen above is the oil cooler line leaking, located just ahead of the oil filter housing. Body Quick Connector w/Bevel Washer At Cooler Fitting 9/16 In. Starting with the lower oil cooler line, pry-off the retaining clip from the hard-line fitting using a small flat-head screwdriver. If the oil flows from the radiator, this is the outlet. They sometime blow the gasket or sometimes when so get trans work done if a longer bolt is installed around this it will hit it and make it leak. radiator failure. The leak seems to be coming from the larger octagon shaped flange that goes around it. Oil cooler leaked into antifreeze, should I have the transmission flushed also? I recently found out that my oil cooler is leaking into my coolant. The B&M cooler can only lower the oil temperature by 20 degrees +/-. dose anyone know how to reapair or cost to repair this for a 05 impala. all the oil lines and coolant lines and coolers look ok. So I have a 2014 Dodge charger se 3. It is common for these lines to leak where the flexible hose part of the line joins the metal tubing. If your car is leaking coolant, it will run normally until the coolant level gets too low. Technically the transmission cooler in the radiator could crack and leak trans fluid into the radiator coolent. I have found coolant and oil leaks in the front of the engine stemming from the oil cooler and oil filter-housing seals. One is at the head gasket where oil can leak across the top of the head to the water passages (or into the cylinder or out the edge of the gasket) if the head isn't properly torqued of perhaps if there is corrosion in the cooling system. Overwhelming odds are the gasket was bad. Replacing the factory oil cooler with the company’s air-to-oil cooler ensures oil is kept cool and coolant keeps flowing. Mount the oil cooler core to the radiator using supplied hardware. If the o ring comes out when you pull the lines out (which this one did) you have to replace the fittings as well. I just went through new leaking trucktec oil cooler lines on my 85SD. This is the quick connect they used for tranny and engine oil cooler lines at the radiator for years and years (what I call a 'spud'):. As it turns out, the upper oil cooler inlet has a small leak. I have a 2000 Chev S10 Blazer which has started leaking fluid from the oil cooler in the front under the radiator. Managed to get the old one out (man those fittings on the cooler lines were a pain to get off), got the used one from the local yard in, no more coolant leak. We offer a wide range of Chevy Oil Cooler Adapters of all the best brands in the industry at an affordable rate that fits the Price Range you are looking for. Dealer said that they should be replaced and the process has a high labor rate. vehicle for this. You can use your old fittings from transmission line. C4 in a 66 Mustang. Pressure test the Oil Cooler. I have replaced a leaking trans cooler/condensor before and if your leaking from behind the grill I would lean towards this, unless the lines are damaged they are typically going to either dump (leaving you on the side of the road) or they are not going to leak. Audi a4 coolant leak behind engine. Start: Some GMC Jimmys and Chevy Blazers have an engine oil cooler. Application - 1983-1995 Mustang. First I thought it's the connection of the left plastic tank to the core but it is the upper engine oil cooler hose connection. I thought my oil cooler was leaking pretty badly, and decided to do the side cover gasket since I had the distributor out. ) So if there is a metal line going into the top of the plastic radiator tank, just below the upper hose inlet (passenger side), then you have the oil cooler. Flowchart for Checking Coolant System for Pressure Leaks. TSB #00-T-66 covers coolant leaks for oil cooler,water pump,thermostat housing and a few other things. This is the aluminum oil to coolant heat exchanger that interfaces with the lower radiator hose and the cooler lines. It doesn't really matter how smoothly it runs if you have coolant and engine oil mixing. So I have a 2014 Dodge charger se 3. Maki, Editor. AB- Tarsand Toyota Club CA. 00 on average. Service Tools Exhaust Manifold, Dry Exhaust Restriction EGR Cooler EGR Valve EGR Cooler Connection Exhaust Gas Pressure Sensor Tube EGR Cooler Coolant Lines Heat Shield. The transmission cooler "lives" inside one of the tanks of your radiator. Engine coolant leaking from oil cooler. 9) Detach the transmission fluid lines near the upper radiator hose leaving the proper connectors in place to reattach your external transmission cooler. Body Quick Connector w/Bevel Washer At Cooler Fitting 9/16 In. The average cost for a Honda Civic trans oil cooler line replacement is between $102 and $123. I have replaced a leaking trans cooler/condensor before and if your leaking from behind the grill I would lean towards this, unless the lines are damaged they are typically going to either dump (leaving you on the side of the road) or they are not going to leak. So a total of 6 hoses/lines connect to its radiator ( 2 each Coolant, Trans, Oil) (7 if you count the overflow tank !). Remove the cylinder liner where the leak was found. The steel fittings are dealer only, with non serviceable o rings. Starting with the lower oil cooler line, pry-off the retaining clip from the hard-line fitting using a small flat-head screwdriver. The 1/4" metal line looks good as do the threads for that connection. Started noticing a drip of oil a few weeks ago, 1 drip at a time under the truckoil leaks drive me crazyso I go under for a look. I was under my truck this weekend to fix a power steering line leak and noticed the transmission cooler line was wet, its not dripping fluid or anything its just wet and its definitely coming from that line. Picture 2 - Close-up on the cooler. 00 for the part. The only oil lines there lead to the transmission and cooler. An oil cooler hose supplies the transmission and engine oil with a way to circulate and cool down. Guaranteed lowest price! Coolant & Coolant Additives. Iv'e been having a small leak from the tranny oil cooler at the front of the truck ('06 V6 xlt). Researching this on cadillac sites i see that it is a common problem for these cars to have a failing oil cooler causing this type of leak in between the block. After further inspection I noticed it was leaking from the actual transmission cooler, which is embedded into to the A/C Condenser. Cadillac 03 Cts Valve Cover Gasket And Intake Manifold Removal Oil. After noticing a puddle of transmission fluid on the garage floor, I suspected a leaky cooler line. Similar to a loss of oil, an external oil cooler failure may force all of the engine coolant out of the engine. When the oil filter is screwed on, it should also help hold the cooler in place. It is common for these lines to leak where the flexible hose part of the line joins the metal tubing. You can pay a mechanic 4 hours labor ($350 - $400) or do it yourself. 5 product ratings - Set of 2 Auto Trans Oil Cooler Line Connector at Radiator for. Parts needed: Both oil cooler lines. I replaced my 95 Tahoe's radiator about 3 weeks ago.