My 1991 pontiac grand Prix le 3.1l overheats when driving longer distances.at first the cooling fans didn't come on. we replaced the sensor and the thermostat and the fans are working now but it still overheats. we want to replace the water pump in hope this will solve the problem. or is there anything else that could cause the overheating?
I had an older vehicle that overheated. I flushed out the radiator twice, but it was so clogged up, I had to replace it, so check the radiator. If you inspect the radiator from the filler neck, you can see if there is crud build-up on the tubes. The problem could be the water pump. Typically when water pumps fail, they start to leak from the weep hole(s) on top and /or bottom. Is there any leak from the pump? If there is, that is indication that the pump need to be replaced. Hope this helps !
so far we haven't detected any kind of leak. but it looked like someone put powdered stop leak into the radiator but the radiator doesn't have a leak. so our thought is to flush the radiator and replace the water pump anyways since the car might still have the original one in it. thank you.
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SOURCE: 1996 Grand Prix SE, cooling fans inop
try the fuse,if not that the wiring is bad from the fan to the switch.
SOURCE: 2004 Pontiac Grand Prix OVERHEATING!!!
Have you shop perform a "leakdown test." You probably have a bad head gasket )or a leak in the gasket).
SOURCE: replaced headgaskets on 95 grand prix 3.4 now overheating
make sure there is no air in the coolant system. As a air lock could accure preventing coolant from circulating and over heating resulting.
look for a plug at the highest point in coolant system. if no plug is found remove thermostat and housing. pour 50/50 water/antifreeze mixture slowly into cold engine block till full. install plug or thermostat. remove radiator cap making sure coolant is full right up to radiator filler neck. also make sure coolant is up to the lower mark on radiator reservoir leaving radiator cap off run engine to operating temp. coolant is flowing threw system when upper rad. hose is hot. shut off engine let cool check and top up coolant levels while squeezing upper rad hose to expel any air that might still be in system. eplace rad cap. take for test drive making sure temp. stays in normal operating range recheck coolant.. as stated at the beging very important that all air is out of coolant system as a air lock could acure preventing coolant from circulating resulting in a over heating situation... hope this helped
SOURCE: 2003 Pontiac Gran Prix GT 3.8L Thermostat replacement
Yes. Remove the housing (not the hose) and you'll find the thermostat.
SOURCE: 2004 GTP Grand Prix overheating in slow traffic
Are the cooling fans coming on during normal operation? If your ac works turn it on and see if it overheats with ac on.If it does not overheat the fans are not operating properly under normal operating conditions.The ac will force the fans on. What you can do to start is just let the car idle in park and see if fans will come on normally. The coolant temp should reach 200-210 before the fans will come on. Make sure the air is off at this time. If we can verify the fans are working or not working properly we can go to the next step. Let me know what you find out.
For car running hot and overheating issues, I suggest to you go
through this help links. Click this link below and go through the
troubleshooting procedure to take care of the problems: ----Car runs hot? http://howtobyme.blogspot.com/2011/11/car-runs-hot-in-traffic.html
-----------All types of car overheating problems and
troubleshooting?
http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html
Car freeze overnight and started overheating while driving?http://technoanswers.blogspot.com/2012/01/car-freeze-overnight-and-started.html-----------Engine Overheats and heater blowing cold?
http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html
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Car overheats and Air blows hot at idle?
http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
--------overheating? http://schematicsdiagram.blogspot.com/2011/12/buick-century-overheating.html
----------Car engine Overheats and transmission starts slipping?http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html
----------This details will help.Thanks.
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