Question about 2000 Pontiac Grand Am GT

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Heat only when driving

I have a 2002 Pontiac Grand AM, I currently replaced the thermostat. When idling there is no heat coming out of the vents, however when driving there is warm to hot air coming out of the vents depending on the acceleration of the car. I have checked the coolant level and it is fine, do you have any other options?

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I would disconnect my heater hoses at firewall & flush some CLR through the core, even if you have to gravity feed it through. A small pump of any kind flushing it through one way, then the other. If you have the time, let the CLR sit in there overnight, then flush it again, and hook hoses back up & fill system, and make sure you bleed out air with heater on, before you put cap back on. I usually let rad cooling fan come on about 3 times before I put cap back on & fill return bottle to level. If not possible, take it to a rad shop & ask them to flush & reverse flush system for you. Your getting resistance from core being partially plugged, that is causing flow to decrease when idling, and the extra push you get when engine revving, gets it flowing better.

Posted on Dec 19, 2008

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Hello you can try flushing the cooling system for restrictions or you could have a belt slipping on waterpump pulley or could be weak waterpump. Hope this gets you warm .

Posted on Dec 19, 2008

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2 Answers

Why does the heater blow hot air when I drive after its been idling for 15min and not during the idle when it reaches the 100 Temp?...(it blows cold air in idle)


Firstly, a thermostat that opens quicker will not give you better heat. Your heater core may be partially plugged causing a low flow issue. Another area to check would be the water pump impeller for corrosion or slipping on the shaft. Does the vehicle's cooling system operate well otherwise?

Jan 27, 2015 | 2002 Pontiac Grand Am

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Little heat coming out of vents.


IF YOU CAN'T FEEL THE AIR FLOW OUT BUT YOU HEAR THE BLOWER MOTOR WORKING, BEHIND THE GLOVE BOX IS A CABIN FILTER.REPLACE FILTER
IF YOU HAVE GOOD AIR FLOW BUT NO HEAT:
1;VACUUM LEAKING TO HEATER CONTROL
2;WATER PUMP GOING BAD / NOT CIRCULATING COOLANT,HIGH RPM/MORE COOLANT TO THE HEATER CORE
3;OPEN THERMOSTAT/ENGINE TEMPERATURE TO LOW
1;CHANGE THE DIRECTION FROM VENTS TO FLOUR TO WINDSHIELD. IF NOTHING HAPPEN IS THE VACUUM
2;RUN THE ENGINE INSIDE ON WARM PLACE ON IDLE.NOTE THE GAUGE IF PAS 1/2 TO 3/4. IF PAS 3/4 MARK REPLACE WATER PUMP
3;IF GAUGE STAY BELOW 1/2 REPLACE THERMOSTAT
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I have a 2005 grand prix gt temp guage reads normal and heat is on and warm when start driving heat gets colder or if i change to defrost its cold air doeasnt stay hot car doesnt over heat though changed...


The heating coil is probably getting plugged up. You may have heat at idle or slow speeds, but once you get going, there is not enough coolant going through it to stay warm. Get the system flushed or replace the heating coil.

Jan 23, 2014 | 2005 Pontiac Grand Am

1 Answer

Hot heat at idle cool when driving


is there a chance that one of your heater hoses are clogged? or where they connect to the engine are clogged still? sounds like a clogged system. Cracked heater housing? Outside air bypassing the heater coil while driving?

Dec 13, 2013 | 2004 Pontiac Grand Prix

1 Answer

Still no heat.....changed thermostat flushed radiator


Possible heater core problem.

Did you check to make sure when you set the heat on that the car climate control move the heat door to allow the heat to come in the vents??

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2002 grand prix heater whines when turning on the heat. Now no noise, but the blower is not pushing heat out the vents. What could this be?


I would say your motor went out and the door under the dash is not opening. Follow cable and or vacuum lines . If you have a hand vacuum pump try pumping on the vacuum actuators to see if doors move or if cable is opening doors after you replace motor

Dec 21, 2011 | 2002 Pontiac Grand Prix

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HELLO I HAVE 1995 GRAND PRIX WITH THE 3.1 MOTOR. MY PROBLEM IS IM NOT GETTING NO HEAT. THE TEMP GAGE GOES TO NORMAL WHEN ITS IDELING WHEN DRIVING GET HOT THEN WHEN I PUSH ON BRAKE OR COME TO A STOP THE...


check the fan and water pump one of these is possibly ur problem when ur at idle there is no heat load and the radiator can dissipate that when ur driving causes more heat if fan isnt working the car wont cool same if problem is water pump at idle pump may be able to move some of the hot anti-freeze but when driving may not be pumping it thru radiator to cool

Dec 22, 2009 | 2004 Pontiac Grand Prix

1 Answer

My car is a 2002 Pontiac Grand am and started to over heat every time i drive it what could it be i replaced the thermostat still over heats can any one help?


if it overheats at freeway speed, its a dirty radiator(flushing it usually don't help but you can try) If it overheats it traffic, then it is the automatic radiator fan(usually driven by electric motor). On some ocation an overheating is caused by retarded timing, but very unlikely on your vehicle since it is computerized.

Aug 04, 2009 | 2002 Pontiac Grand Am

1 Answer

2002 pontiac grand prix over heating


Are your electric fans engaging or turning on?

Dec 26, 2008 | 2002 Pontiac Grand Prix

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