Question about 1995 Pontiac Grand Prix

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Water pump how can i check to see if water pump is working correctly

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If you look on the under side of the water pump you will see a small hole. This is called a weep hole. If the seal in the water pump shaft is going out it will usually leave a trail of coolant from the hole. When you start you car in the morning the coolant is cold. As the coolant warms up the thermostat opens and releases the hotter coolant to the radiator. Start the vehicle when cold with the radiator cap removed let it warm up as normal. You can purchase a cheap automotive thermometer to place in the radiator to tell you when the coolant temp is rising. When the thermostat opens the pump will push the coolant through the radiator. You can usually actually see this if you look into the top of the radiator if you crack the throttle sharply. If your thermostat is opening and the water pump is working and you have an overheating condition I would check to see if the tubes in the radiator are restricted.

Posted on Feb 19, 2012

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My 2002 Pontiac Montana out of no where started to overheat and smoke from under the hood and the back it doesn't have a bad smell and all fans work so do my heat and my air so what can the problem...


First I'd check your water levels and top up if required. Then check for leaks. If all is good so far I'd look at your water pump to make sure water is circulating. So check the belts for the correct tension and check the pump for any leaks coming from it. Leaks can be a sign of a worn pump. Check the thermostat next to see if it opens at the correct temperature or remove it altogether. Hope this helps. Just don't drive to much on an overheating car as the can warp the cylinder head which is a much more expensive issue to put right.

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My toyota Celica is not circulating water in the engine. I have changed the thermostat and checked the radiator but still it keeps on heating up and does not allow water in the engine.


IS YOUR THERMOSTAT (OEM) OR (AFTERMARKET) GENERIC FROM AUTOPARTS, IT ALMOST SOUNDS LIKE YOU DON'T HAVE THE RIGHT THERMOSTAT ON IT...

I.'M ALSO ASSUMING THE YOUR WATER PUMP IS WORKING CORRECTLY RIGHT ? IS WORKING CORRECTLY RIGHT ?

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Who did the job? If you did it it privately, possible you did not do the whole job. You have to bleed the system for air comes out of the cooling system, also check if the timing belt is correct fitted.And last check if the cooling fan is working.

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checked water pump for circulating the coolant?
checked the radiator if the coolant circulated correctly?
thermostat renewed?
thermo switch checked whether is working?
fan switch checked whether is working?
checked whether the matrix could circulate the coolant?
ckecked whether there is any valve on the matrix hoses and is working?
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have you checked whether you have a cylinder head gasket with problem and pressurized the water?
checked whether have a cracked cylinder head and on accelaration expanded the water hoses?
have you checked whether the radiator cap is working ok?
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The car is overheating and blowing cold air out of the heater. replaced the thermostat and still haven the same problem. what else could i check for?


it sounds like either your head gasket has gone or your water pump is not working correctly. try taking off your radiator / expansion tank cap and turning over engine, if the water is pushed out of the tank your engine is pressurising, a sign of blown head gasket. to check the water pump is not as easy. check to see if the radiator is getting hot and fan cutting in.

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first thing to check is to make sure that your antifreeze to water ratio is the correct mix. also check to make sure that your thermostat is good and working properly ( opening at the right temp ).
could also be a bad water pump or a slipping water pump belt.

c...

Jan 03, 2011 | 2003 Pontiac Montana

1 Answer

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Problem is not your radiator--unfortunate for you. It's more likely the water pump. The water pump pumps the water around through your radiator to be cooled and then through the engine block to cool your motor. Before you go tearing the water pump out though, you may want to check to see if your fan belt is in good condition and working properly because the water pump works off of the fan belt turning the pulley to pump the water around. If the fan belt is off that pulley, it may need to be put back on or re-routed correctly to start pumping the water.

Then if that is not your problem, the water pump will probably need to be replaced. I believe it can be accessed from underneath the engine compartment, but first you will have to take the tension off the fan belt and remove the belt, then loosen the bolts around the front of the water pump. Put a catch pan under the car though because all your water/antifreeze will come gushing out. That water pump should be available at your local AutoZone or another auto parts store for around $100.

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