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Oil mixing in coolant - 1999 Chevrolet Malibu

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This would be a bad head gasket or cracked block. lets hope for a head gasket.

Posted on Nov 17, 2010

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Transmission cooler inside the plastic parts of the radiator may be leaking and causing the oil to mix with the coolant. GM also has a problem with their lower intake gaskets leaking, which would allow the oil and coolant to mix. Last possibility is the head gasket is leaking and mixing the oil into the coolant side but not the other way. Check your transmission fluid for mixing evidence. Another thing to do is pressure test your cooling system (Radiator, hoses ect) to see if there is a leak. Another test to try out is compression.

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I have a 2001 Ford windstar, I was told while having my oil changed that there was oil in my coolant, yet when my we removed the coolant from the reservoir and waited for it to separate it never did, which...


In my opinion, if you drained the coolant and there was NO OIL in it or any evidence ( an oily film in the reservoir), you were the poor victim of a dishonest oil change facility.

Just watch your coolant and oil level daily for the next week or so. If any milky residue appears on the inside of the cap where you add oil, or any oil film builds up on the coolant reservoir, then you might have a problem. Most likely a head gasket has failed.

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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...


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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.

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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).

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have you checked your engine oil if it looks the same?? If your engine oil is mixed/milky colored, then its your head gasket!!hopefully this helps!!

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