Question about 1995 Pontiac Grand Prix

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1995 Pontiac Grand Prix GTP 3.4 L

Bought this car with 150,000 miles on and actually in great shape , runs great except it overheats, replaced radiator (with new one), new thermostat, new water pump, and when I fill it and try to bleed it out Takes @ 15 mins and I hardly get any fluid out of top housing where the radiator hose connects,...Any suggestions??only takes @ 10 mins to overheat, engine doesnt miss, etc.
RC

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There could be several reasons that may cause an engine to overheat. It sounds like you have covered the most important ones. Thermostat,radiator and water pump. Hopefully you do not have internal damage, cracked head, head gasket, or a cracked block. I would try flushing the heater core and pay close attention to what comes out. You know, is it clogged with stop leak or rust. Then while I was flushing that I would drain the entire system and put in some Prestone super radiator flush. You just add plain water with it and run your vehicle for about 10 minutes. You then empty your cooliant system and refill with antifreeze. The flush works pretty well and if there is an obstruction from a previous owner putting stop leak in the system it generally will clean it out.
BTW, are you sure the thermostat is in properly? Not upside down? I think I would start there before I went through all of the work of flushing the system. It actually sounds like from everything you've done already, that's possible. Hey it does happen once in awhile. Was this car overheating when you bought it? If so, maybe the previous owner put it in upside down, and when you changed it put it in the same way by accident.
Hope this helps.

Posted on Mar 10, 2009

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