Question about 2002 Pontiac Grand Am

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2002 Pontiac Grnad AM. Engine temp at 200. Air

2002 Pontiac Grand AM. Engine temp at 200. Air blows cold. When rev engine air get hot. Cools back down at idle.

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  • Anonymous Mar 30, 2014

    revs 4rpm fast like it going to blow

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Most likely a bad water pump and/or low coolant level

Posted on Feb 24, 2010

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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

1 Answer

Heat goes in and out and the temp gauge goes up and down


Your temp sensor has nothing to do with your heater. The temp sensor needs coolant in order to work properly. So first check the coolant level because if it is low your heater will act the way you describe. Once the coolant gets low enough the heater will blow cold. Another possibility is the radiator cap. After the engine has warmed up it expands when it cools down it contracts. As it is contracting if the cap is weak air can be drawn into the system and cause air pockets to form and will cause the same problem

Feb 09, 2013 | 2000 Pontiac Grand Prix

1 Answer

My 2000 grand prix blows out cold air when its on heat


Could be air in the cooling system , try an bleed the system . On top of the thermostat housing is a bleeder valve , with the engine up to temp. open valve till coolant comes out . Is the coolant full ? What color is the coolant ? Have see where coolant turns like a muddy color an clogges the heater core an engine coolant passages . Check the heater hoses going into the fire wall ,are they hot ? Does your grand prix have manual or automatic climate control ? Duel zone ! Do you hear a clicking sound behind the instrument panel ? Bad temp blend auctuator .

Feb 20, 2018 | 2000 Pontiac Grand Prix

1 Answer

2004 grand am 3.4l , flushed radiator and now have air bubble. have tried to when cold take off tank overfill cap and loosen vent plug but cant get rid of air pocket. when engine is cold the 2 radiator...


Did you try running your heat to make the water move through the engine? Make sure it's set to blow on your feet (that's really heat) and set the temp on high heat. Hope that works.

Apr 30, 2011 | 2004 Pontiac Grand Am

2 Answers

My heater on my 2002 pontiac grand prix blows hot then cold air my wife hit a huge pothole on sunday then after that this started doing this please help


check you climate control vacuum hose. it may have come loose or crimped. its located beneath and under battery mount box. also check to see if your coolant resvouir is full as well as your resivour cap is tight.

Jan 26, 2010 | 2002 Pontiac Grand Prix

1 Answer

Coolant system


think it needs more coolant added when engine is cold

Jan 18, 2010 | 2002 Pontiac Grand Prix

2 Answers

2002 grand prix, will not blow hot air, engine heats up fine and cooling system checks ok.


With the engine warmed up feel the heater lines going into the firewall. You will probably find that one is very hot and the other only look warm or even cold. If this is the case the heater core needs to be flushed. With the engine cold remove the hoses at a convenient location and back flush the heater core. Reconnect the lines and warm the engine back up with the heat on.

Jan 11, 2010 | 2002 Pontiac Grand Prix

2 Answers

Grand prix 3800 blowing only hot air please help


check the temp control switch in the dash

Jun 19, 2009 | 2002 Pontiac Grand Prix

1 Answer

2004 xterra temp rises when stopped, goes back down when moving


sounds to me like the thermostat may be stuck. i would check the coolant, fan, and belts.

Dec 13, 2008 | 2005 Nissan Xterra

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