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

1999 cavalier 2.2L, I flushed the system thinking the antifreeze was old, but it got milky again in under 2 weeks. It has been leaking but the level doesn't go down, temp gauge has never shown hot but does move and register temp. Oil needs to be changed but it is not milky. took apart intake manifold and throttle body there is no cross over point... what could be the issue?

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  • 109 Answers

Cylinder head gasket needs to be replaced

Posted on Mar 10, 2017

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Posted on Jan 02, 2017

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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

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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

  • 31 Answers

SOURCE: coolant leak on 96 olds ciera 3.1

Head gasket. The reason for the cold then hot readings is the cooling system is getting gas bound by exhaust gases. A simple intake leak would just make you loose fluid, but wouldn't cause the other symptoms until the coolant was very low. Which leads me to, is the coolant full? The head gasket most of the time will not leak coolant into the oil, but instead coolant will go into the combustion chamber, and exhaust gasses will go into the coolant. You don't see any white smoke until the leak gets extreme. Then shortly after that the engine hydro locks from too much coolant in the combustion chamber. There is a tester that will test your coolant for CO gas. That is the proof of a head gasket leak.

Posted on Feb 09, 2009

  • 1 Answer

SOURCE: overheating

It could be your head gasket.

Posted on Feb 12, 2009

  • 50 Answers

SOURCE: 2004 cheverolet impala 3.4L engine

Sounds like you have an air;lock in your cooling system.Try placing a bleeder on the return hose to the heater core ........looks like a small tap

Posted on Aug 18, 2010

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


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

Nov 21, 2013 | Dodge Cars & Trucks

1 Answer

Overheating


Doesn't sound like it ran hot enough or long enough to crack or warp the head. If there is a crack, the engine will continue to overheat. If a warped head, car would probably run rough, the affected cylinders would likely have little or no compression, there would be a noticeable miss, and overheating would continue.
Why the low coolant? It's a sealed system, so should never have to add coolant, other than a small loss from evaporation in the overflow tank. Monitor the level closely for the next few days. Note the level in the overflow tank to see if it drops over time. Leaks can be external anywhere in the coolant system-engine, radiator, hoses, heater core- or internal in the engine-head gasket failures can cause coolant in the cylinders (white smoke out the exhaust), or coolant in the oil (oil will have a milky brown look to it), or oil in the coolant (will see traces of oil in the radiator).
A couple of tests may be called for. A pressure test of the coolant system will check if the system holds pressure as it should-about 15 psi. If pressure does not hold, there is a leak somewhere. Water pumps usually leak through the weep hole when they fail. A radiator leak would show up when pressure is applied. If pressure does hold, check if you have a good radiator cap-the cap is what seals the system so pressure will maintain. Coolant under pressure raises it's boiling point by about 10 degrees, so is critical to keep the system under pressure.
If you suspect further problems-losing coolant or continued overheating-then have the chemical test done to check for exhaust gasses in the coolant. Basically a check if the head gasket is good, a simple test done at the radiator cap opening with a special fluid that changes color if hydrocarbons are present in the cooling system.
Or you could have a compression test of the cylinders to check the internal mechanical condition-not only tells you if head gasket is good, also tells you a lot about engine condition-even,. balanced, good compression in all cylinders translates into good power output-rings are good, valves are sealing good, all systems go.
The cooling system: water pump, thermostat, radiator, hoses, heater core and hoses, radiator cap, overflow tank, and the cooling fans and associated wiring. Make sure everything is working right and you'll be good to go.

Sep 17, 2013 | 1994 Toyota Camry

1 Answer

Light brown junk in radiator


I suspect you have a leaking cylinder head gasket, this would account for the gunk in the system. To confirm this is the problem have a shop that owns an exhaust gas analyzer put the probe in the coolant recovery or surge tank of the system and see if any combustion gases show up in the system with the car running, do the test both hot and cold engine states. You will be looking for hydrocarbons. No matter what the outcome you must have the system professionally flushes and clean uncontaminated coolant installed Ina proportion of 50/50 coolant to water mix.

Jul 12, 2012 | 2009 Honda Pilot EX-L

1 Answer

Is a compression test a conclusive way to check for a leaking head gasket? My 99 honda civic (D16Y7) Is losing coolant and ruining radiator caps from the coolant obviously getting too hot. I did a...


Check for milky oil
It may help to have the radiator cleaned and flushed, and a new thermostat installed, the coolant may be going out the overflow
Not certain how it ruins radiator caps, they hold about 5psi in the radiatior and let excess pressure into the overflow, then when the engine cools, allow coolant to s uck back form the overflow tank

May 27, 2011 | 1999 Honda Civic

1 Answer

Does the trans cooler exist inside the radiator on this V6 engine/auto trans combo? I found a brown foam in my 2001 Saturn V6's coolant overflow tank. It was so thick, i could not read the coolant level. ...


hmmm..........there is a OiL COOLER tube for the transmission cooler in ur radiator, that to keep ur tranny fluid to cool down!

As u said, u checked the engine oil, and it has no decrease on oil level!

Ur right about that... better bring that to ur mechanic and evaluate the radiator, the tube inside might have been damage or corroded!

Hope the seals up ur probs!

Dec 04, 2010 | 2004 Saturn L-Series

1 Answer

I have a 4liter '96 4door explorer 2 wheel drive. Temp gauge is showing pegged all the way after a couple of minutes driving then after 1 to 2 minutes it goes down to mid and stays there. when it overheats...


The thermostat is slow to open because the coolant is too thick from the oil. The coolant is thick because oil is getting into the coolant. It sounds like you have a leaking head gasket or a cracked head.

Nov 06, 2010 | 1996 Ford Explorer

1 Answer

Over heats when a/c is running in town.i flushed the system and new thermostat.99 dakota v-8. If it is the head gasket would you see coolant being burned. Thanks


IF HEADGASKET IS BAD check your oil it will be gray and milky also your coolant level will be low in the radiator.

Jul 01, 2010 | 1999 Dodge Dakota

1 Answer

I have rusty water in my overflow wich keeps bubbling over,possible leak in hose? tepmature seems ok on gauge but on short drive i will lose half if not all water in overflow


The level in the overflow will go up and down. The rusty water means that you will need to have you cooling system flushed out and new coolant added. This is something that should be done at least every other year but is seldom done.

Jun 28, 2010 | 1998 Mercury Sable

2 Answers

99 cavalier temperature gauge won't work


Sounds like your cluster died, try getting one from a salvage yard.

Mar 02, 2009 | 1999 Chevrolet Cavalier

1 Answer

Car experiencing a sputtering when excellerating. Noticed it was getting hotter when I would excellerate and the needle would drop back down when my foot was off the excellerater. Also the oil light...


This really sounds like you have a leaky head gasket or worse, a cracked water jacket. You may be getting coolant into your crankcase, which would "water down", so to speak, your oil and cause you to lose oil pressure. I do not know what you mean by your "oil registering fine". I presume you mean the level on the dipstick. Do you keep losing coolant? Is there any brown/white milky sludge under your oil cap or on your dipstick? If so, you most likey would have a head gasket leak.

Jul 17, 2008 | Ford Windstar Cars & Trucks

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