Question about 2007 Volkswagen Jetta 2.5 Sedan

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Leaking engine oil cooler / heat exchanger - 2007 Volkswagen Jetta 2.5 Sedan

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  • Volkswagen Master
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Replace it.

Posted on Jan 26, 2015

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Posted on Jan 02, 2017

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Selvol
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SOURCE: oil in water resovour vw 2002 passat

Could be just the OIL COOLER. VW IS CORRECT.
If the oil cooloer fails internely you will have a mix of coolant and oil. In the engine and in the Radiator,

But not to say the other guys were wrong...

Posted on Jun 18, 2009

jharvey572
  • 447 Answers

SOURCE: My 2000 Jetta 2.0 is

let car cool down clean oil cooler make sure no oil visible. start engine keep looking see were oil is leaking from use torch or lamp if nessesary

Posted on Aug 02, 2011

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Thick oil floating in the radiator overflow tank


red or pink oil is transmission oil cooler in tank failed
if it is black oil check for the sump oil cooler is not leaking at the heat exchanger

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1999 F-250 5.4 SUPER DUTY COOLANT GOING STRAIGHT INTO OIL PAN NO SMOKE NO SLUDGE ON OIL CAP COULD IT BE OIL COOLER ADAPTER


If the heat exchanger for oil heat is at the oil filter it not likely. The coolant will be an external leak. Sounds like a head gasket failure. Due to age(1999) Thermal Shear probably occurred or electrolysis condition in cylinder sleeves

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water in the oil ,can be from head gasket failure ,cracked head but most probably from corrosion behind the water pump impellor. If the engine has an engine oil cooler then the cooler unit is suspect. Check any unit attached to the engine that uses coolant for cooling

If the water is in the transmission oil then it will be the heat exchanger in the radiator tank and will require a new radiator

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Cadillac CTS 3.6L V6 - The water in the water reservoir is mixed with what appears to be either engine or transmission oil.


If it is transmission fluid it is likely the heat exchanger (or cooler) has sprung a leak. The cooler is often integrated into the main radiator bottom tank. If fluid is entering the cooling system it is possible coolant could be entering the transmission.

Tranny fluid will appear clean and floating on the surface of the coolant and is likely to be pink or red while if it is engine oil it will be an altogether dirtier colour and more viscous. Try capturing a sample with some clean white tissue when the engine is cold.

Engine oil in the coolant could be a sign of a failing cylinder head gasket.
A failing head gasket is likely to produce unusual cooling system symptoms including ejecting coolant from the reservoir while a leaky tranny oil cooler is unlikely to have much effect on cooling system behaviour except for the obvious...

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Hi, i have automatic passat 1999 model and recently water happens to get into the gear box and it control board, i experiences a boom sound anytime the gear is changed, the oil has been changed by the...


If no external leak and the transmission fluid colour looks white, the problem belongs to the automatic gearbox oil cooler. The oil cooler has broke mixing the gearbox oil and coolant causing this milkshake. It's a small radiator core type oil / water heat exchanger. It is cracked inside and transmission oil is mixed with engine coolant. Because the transmission oil pressure is greater than engine coolant pressure, the transmission fluid level drops. See also the coolant colour inside recovery coolant reservoir inder bonnet! It could be like this:

tdisline_495.jpg
The automatic gearbox oil cooler type oil / water heat exchanger (oil cooler):

tdisline_496.jpg
In the picture above the transmission oil pan was removed for oil filter replacement.

May 05, 2011 | 1999 Volkswagen Passat

1 Answer

Transmission fluid level need regular top up and there is no external leak.Fluid color looks white.


If no external leak and the transmission fluid colour looks white, the problem belongs to the automatic gearbox oil cooler. The oil cooler has broke mixing the gearbox oil and coolant causing this milkshake. It's a small radiator core type oil / water heat exchanger. It is cracked inside and transmission oil is mixed with engine coolant. Because the transmission oil pressure is greater than engine coolant pressure, the transmission fluid level drops. See also the coolant colour inside recovery coolant reservoir inder bonnet! It could be like this:

9d86426.jpg

The automatic gearbox oil cooler type oil / water heat exchanger (oil cooler):

138b4e6.jpg
(In the picture above the transmission oil pan was removed for oil filter replacement).

Oct 29, 2010 | 2005 Audi A4

1 Answer

Coolant was brown sludge wahat is that and why


Sounds like you have a leaking oil cooler, it is under the intake manifold, it is actually a heat exchanger. It uses engine coolant to cool the oil.

Oct 04, 2010 | 2003 Saturn VUE

1 Answer

My car is a volkswagen passat diesel .there is oil in the coolant i was first told the head gasket had blowen. i have also been told it could be the oil cooler. the car is not over heating in fact the...


There is a very easy way to check the oil cooler for leaks.

Do this with the engine cool and be prepared to catch some coolant in a pan.

Remove the 2 coolant hoses from the oil cooler and attach them together using a 5/8 inch straight heater hose connector. You are bypassing the oil cooler temporarily. Wipe the oil cooler clean so you can clearly see any leaks develop.

Now run the engine and watch the oil cooler pipes (the ones you just removed the hoses from) carefully. If you begin to see oil seeping from the cooler pipes you've found your problem.

This might take a while to see so be patient and let the car run for at least 15 mins or more.

Don't worry about the cooler being disconnected while the car is running, but I do recommend reconnecting the cooler if you have to drive it even if you find it to be leaking.

If it is found to be leaking, you will need to replace the part and have your coolant flushed out properly to remove as much of the oil as possible from the system. Also change the engine oil at the same time, it is possible that coolant has gotten into the oil although it may not be obvious.

Good luck.

Jan 31, 2010 | 2001 Volkswagen Passat

3 Answers

Oil in water resovour vw 2002 passat


Could be just the OIL COOLER. VW IS CORRECT.
If the oil cooloer fails internely you will have a mix of coolant and oil. In the engine and in the Radiator,

But not to say the other guys were wrong...

May 27, 2009 | 2003 Volkswagen Passat

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