Mechanics

CHEVY

2002 Chevrolet Cavalier

Engine Cooling problem
2002 Chevy Cavalier 4 cyl

the water in the reservoir is slowly steaming out of the overflow tube when it reaches about 197 on the gauge. I've flushed the system and replaced the thermostat and the fan. It never goes above 197 until most of the water steams out, what could be causing this?
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Paulhand
July 21, 2010.




Have the cap tested to be sure it can hold pressure. If it is ok, you may need to have the cooling system chemical tested for exhaust gasses (bad head gasket). Do you have the proper coolant/water mix or is it just water in the cooling system? I just water it will boil at this temp causing the excessive pressure to be let out at the cap

Tiny
Jack42
Jul 21, 2010.
Are you using coolant or only water? Also, I need you to check some things. First, is there any coolant mixing with the oil? Any oil mixing with the coolant? Also, check the front corners of the cylender head for evidence of coolant leaks. Finally, with the engine cold, remove the radiator cap and start the engine. Does any of the coolant come shooting out?

Sorry for all the questions, but based on what you replaced, I really am thinking you have a bad head gasket and that is causing the problem. If coolant is forced from the radiator when it is cold and you just start the engine, that tells me compression is making its way into the system.

Let me know what you find. Also, check closely for evidence of leaks around the head. Most common spot is the driver's side front of the engine for leaks.

Joe
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Im using just water at the moment I was going to wait to put coolant after it quit steaming so I didn't waste it. I checked the dipstick for signs of water and didn't see any and there isn't any oil in the water. It doesn't have a radiator cap just a reservoir and it doesn't shoot out of it when engine is cold and just started. Do you think the coolant will keep it from steaming out at that temperature?

Tiny
Paulhand
Jul 21, 2010.
I would think so. Since water boils at 212 and coolant will go to 275, that may be part of the problem. Are you sure there are no leaks around the head?

Nope I can't see any leaks anywhere.

Tiny
Paulhand
Jul 22, 2010.
I would recommend trying one more thing before installing the coolant. Pressure test the cooling system so you can check for leaks. You will need a pump to do it. Most parts stores will lend or rent them to you. It is nothing more than a hand pump that screws on to where the rad cap is. Pressureize the system and check for leaks. If there are none, the I recommend installing a 50% coolant and 50% water solution into the engine to see if that takes care of the problem.

Let me know what you find.

Joe


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