[Chevy 84]

I went out to my garage yesterday and started up my '84 Camaro to let it run since I dont drive it often. After about 10 minutes the water in the coolant reservior started to bubble over. I went out this morning to see would it do it again and it did. I dont think that the car is overheating and the electric fan is kicking on. What can be causing this?

[Jmark]

I would suspect that the thermostat is stuck closed.

Remove it and replace it and ck it again.

Mark

[PatM]

Or perhaps you just filled the overflow container to the top while the motor was cold. Expanding fluid/steam in the top of the radiator will push fluid out into the overflow. And the overflow will overflow. . . .
Pat

[Chevy 84]

No, it was'nt that. The overflow was actually not even half full, which is why I could'nt understand how coolant would actually back fill and overflow out of the overflow. I'm going to replace the thermostat and see what happens. Thanks for the advice.

[va4cqd]

blown head gasket?

[Chevy 84]

I removed the thermostat and let the engine idle for about 10 minutes and water still begin to bubble in the overflow reservior. I was told that possibly the water pump is'nt circulating water through the engine which is causing this. So now I'm guessing between the water pump and a blown head gasket. When I start the car up I do see a little water coming out of the tail pipe but I'm not sure whether it's the normal condensation or water from a blown gasket. Are there any tricks out there to narrow this problem down to exactly what's wong. I'm leaning more toward the water pump because I dont feel any pressure on the hoses.