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99 cavalier, thick milky coolant in overflow, oil is fine, losing "coolant" but level is not going down

I did a flush and fill 2 months ago thinking the coolant was just old and replaced the upper radiator hose as it was swollen and weeping. three weeks later I noticed the coolant was starting to get milky again, a peach color (dexcool) and my brand new hose is now swollen and weepy again. the oil needs to be changed but it does not show any antifreeze in it. I took apart the throttle body and intake manifold, no signs of antifreeze and no cross over point in this style although the seal was bad and there was oil in it. coolant is now the consistency of pudding, the level never goes down but it has been leaking a little bit, engine has never over heated... not sure if it is the head gasket or maybe oil cooler?? any ideas??

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Automatic transmission ? If yes, I'd suspect transmission oil mixing with coolant in radiator.

Posted on Nov 21, 2013

  • Debby
    Debby Dec 04, 2013

    I crawled under the car and checked the oil and transmission fluids (this is the most ridiculious design for checking your ATF!) Oil was dark, like i said, needs to be changed, ATF has a little cloudiness to it. I am suspecting the tranny cooler which is built into the radiator. I have pulled the radiator (if you loosen the fan and remove all the hoses you can actually pull it out from in front of the cross over bar and the condensor, it is a tight fit, but do-able) as soon as I can get the parts and put everything back together I will let you know... still crossing my fingers that it is not the head gasket


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  • Contributor
  • 42 Answers

Your head gasket is bad. the reason your oil doesn't look bad is because your oil pressure is higher than your coolant pressure. which would also contribute to you radiator hose damage.

Posted on Nov 21, 2013


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Posted on Jan 02, 2017

66 chrgr
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SOURCE: seem to be losing oil in coolant of 2003 impala 3.4

hello your intake gasket is most likely leaking internally into your engine.pretty common problem.the plastic and silicon gaskets get weak over time.

Posted on Jan 26, 2009

  • 2920 Answers

SOURCE: coolant leaking on manifold, steaming.No hose or radiator leak.

i think its going to be the head gasket duto the way its leaking coolant. one of the water jackets maybe i would have it checked to be sure but it sounds like head gasket

Posted on Feb 03, 2009

  • 1 Answer

SOURCE: overheating

It could be your head gasket.

Posted on Feb 12, 2009

  • 316 Answers

SOURCE: Coolant overflowing out of expansion tank no boil no steam

As you've stated driving around town it's fine, and everything is working well. For the symptoms, there are 2 possible causes:
1. Your cooling fans are not working.
2. Your radiator needs to be replaced.
I'm sure you can determine which it is, and I wish you luck on your repair.

Posted on Jun 02, 2009

  • 1 Answer

SOURCE: My 1995 Riviera is overheating and this has become

I think you might want to have your cam sensor checked

Posted on Jul 21, 2010

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