Overheating

Tiny
JAMES BRENNAN
  • MEMBER
  • PONTIAC FIREBIRD
My 1996 firebird formula 5.7 liter V-8, automatic w/air began overheating and losing fluid. I found a leaky hose and replaced it. The water pump began leaking and it was replaced. It was still losing fluid. I replaced the radiator. It still overheats and loses fluid. I had it checked for exhaust gases in the radiator and there were none. A pressure test revealed no leaks. The overheating usually starts when idling, and when the engine revolutions are increased to about 2000 it cools somewhat. I wonder if the drive mechanism for the waterpump could be slipping? How would I go about checking this. There is a shaft coming out of the front of the engine coupled to the water pump. What drives this shaft, and could it be slipping, or is it gear driven? Thanks
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Friday, August 31st, 2007 AT 5:41 AM

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Tiny
JAMES BRENNAN
  • MEMBER
150,000 miles
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Friday, August 31st, 2007 AT 8:23 AM

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