1995 Chevy Chevelle Please Help my car i dont know what is

1995 CHEVROLET CHEVELLE
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BRIIBABIIYY
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We replaced the relay switch, we replaced the fan motoer, thermostat, and by passed the fan switch, and it still over heats with cap on, is good with cap off. If you know what the problem is please answer this.

Thank You.
It is a Chevy Cavallier 1994 3.1V6
Jan 21, 2010 at 6:36 PM
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MIRROCK
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Did you check the waterpump? With the cap off can you tell if the water is circulating. Also may want to look into a block check. There is a small kit you buy from your local autoparts for this. It will help you check to see if exhaust gasses are getting into you cooling system.
Jan 22, 2010 at 7:51 AM