Question about 2002 Pontiac Grand Am

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Heater fan blows out cool air then car over heats then blows hot and cools the car back off. It does this over and over. Changed thermastat and waterpump already.

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Heatcore is probably bad.

Posted on Nov 13, 2009

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Is your vehicle automat climate control ?
suspect the tempreture sensor in the vehicle is defective and is not giving a true reading of the relationship between the set tempreture and the true air tempreture.

Posted on Nov 13, 2009

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Posted on Jan 02, 2017

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1 Answer

Corvette troubleshooting


if no air in the system from internal heater or other places
new thermostat and radiator cap
good firm coolant hoses

old school air bleed
you fill coolant system with motor running
heater on in the car and thermostat open

burp the hoses until bubbles are no more

if still no better
what about these possibles
faulty coolant temp sender
head gasket failed
clogged radiator
cooling fans not spinning fast enough
or not coming on soon enough

Mar 20, 2017 | Cars & Trucks

1 Answer

2008 V6 3.9 pontiac montana still over heating


Hi, Yes you have an air lock in your system, you may get this sorted by 1/. Removing one of the cooling hoses & try to blow with air.
2/. Drain all the system then put your heater on inside the vehicle & have the engine running & refill the system Start to do this from a cold engine. Please leave me feed back: Malcolm Campbell, Thanks.

Oct 27, 2017 | Pontiac Montana Cars & Trucks

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Audi a4 2.8l no heat


take the top off the filler cap run engine to boil. keep it full off water to the top. you will see air bubbles coming out as the engine gets hotter. squeeze the pipes on the rads to help the air come out. when fan kicks in turn engine off and leave to cool down.while you are doing this make sure the fan for heater is off but is on full heat. can have fan on number one on speed that is fine.

Mar 01, 2013 | 2000 Audi A4

1 Answer

My cooling fans dont work, and the heater blows cold air.


head gasket is blown....big job and expensive

Dec 19, 2012 | 1995 Ford Windstar

1 Answer

Getting hot changed thermastat stil over heating


The lincoln requires using a vacume tool to put the coolant back into the system this removes air from the cooling system which causes air locks and overheating. This is the first place to start. Then testing the electronics will be required to test the cooling fans and related electronics.

May 30, 2010 | 2001 Lincoln LS

1 Answer

2000 Jeep Grand Cherokee, heater wont blow heat!


Check the thermastat or your cooling fan to make sure all is working good. If your engine cant warm up, you will not produce any heat inside the car

Feb 04, 2010 | 2000 Jeep Grand Cherokee

1 Answer

I dont have any heat. i put in a new thermastat.antifreeze is good. it just blows cool air


One or more of:

1. Your coolant level is low
2. Your thermostat doesn't close and needs to be changed
3. The valve from the cooling system to the heater core is stuck
4. Your heater core is clogged

Jan 06, 2010 | 2001 Mercury Cougar

2 Answers

Replaced radiater ,thermastat still no heat and


Did you run engine from cold, WITH HEATER ON, and fill cap off when re-filling system? If not, try that and see what happens. Let the engine get up to operating temperature and rad fan come on to cool 2 or 3 times before putting cap back on.

Nov 17, 2009 | 1995 Subaru Legacy

1 Answer

Fan works ok blows cool air thermastat is ok


This could be that the actuator that opens the door in the heater is dead.. or the actual heater-core is bad. Which is costly and expensive.

Oct 19, 2009 | 2003 Mitsubishi Galant

1 Answer

The heater is blowing warm (not hot) air


This could be your thermostat. If the thermastat is stuck open the coolant will not build up enough heat. When the coolant reaches your heater core it has not been superheated by the engine because your radiator and fan are contiuously cooling it. I would change the thermostat. That would be a good place to start. I hope this has been helpful.

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