i have a 1995 pontiac gran prix gtp 3.4 motor well ive replaced the water pump the thermostat and ive unscrewed the bleeder nut on the hose coming from rad to motor and i still cant get the coolant to circulate help me somebody please im going crazy
Is the t-stat facing the right way, and is it the proper temperature t-stat? There are lots of things that can stop the coolant from circulating but the main culprit is the t-stat. Make sure you don't have any collapsed hoses. You might want to try running the engine with the t-stat removed. If there's still no circulation, you've got some sort of major blockage in the water jacket or passageways. I'm guessing the car was overheating, which led you to replace those parts? You can try a power flush and see what comes out, but if you've got a serious blockage it might require pullling the freeze plugs to see what''s going on.
Good advice from Norm although I think a major blockage in the block is unlikely. More likely thermostat, water pump or a bunch of air in the system that won't move. For some reason modern engines are tough to fill and bleed the air out of. A lot of mechanics have a vacuum tool they use when filling modern cooling systems. You might need to get it professionally done by someone so equipped.
I'm a qualified ASE Master auto tech at a local shop and I'd have to say that both these gentlemen are correct. The first and primary culprit would be the thermostat. Did you replace the thermostat when you installed the engine into your car? Also, it's VERY rare but , altho it's possible that if you don't find the problem in the thermostat the pulley on the water pump may have come loose from the vanes and isn't moving your coolant. Also when the engine is running are any of your coolant hoses collapsing when the car is warmed up? What do you know of the history of your replacement engine I've experienced that a water pump with the vanes going the wrong direction will cause an overheating issue. Finally backflush your cooling system. It should be done every 100,00 miles. Then check your cooling system stem to stern. There's really not that much to it.
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