Question about 2002 Pontiac Grand Prix

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Heater does not blow hot air, only cold. Temperature is higher than normal.

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Must be the thermostat mate get it changed

Posted on Jan 09, 2009

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Posted on Jan 02, 2017

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1 Answer

96 s-10. Temperature gage shows normal temp. Heater blows only COLD air. Can you help?


Check the heater hoses at the engine firewall are they hot? If so then the air temperature control blend door is either jammed or the motor that operates it is defective or both.

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2002 Nissan Altima Cold air blows at idle but is warm at higher engine RPM


Heater core may be clogged. Try flushing it to see if water flows through freely. Also check the heater water control valve for restrictions.

Dec 15, 2017 | 2002 Nissan Altima

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My heater will only blow out hot ait after i have driven the truck for a while if the truck is just sitting it will only blow out cold air only what is wrong


Check both heater core hoses at the firewall to feel if they are getting hot to the touch when the vehicle has idled at normal operating temperature. If both tubes are not hot, then there is a circulation of coolant problem in the heater core. The heater core is plugged

It will have to be flushed out or replaced to rectify the situation.

Also, check the blend door. If the vacuum actuator for the blend door doesn't function then it won't allow hot air to enter the cabin.

Good luck on this repair.

Jan 25, 2011 | 2004 Cadillac Escalade

1 Answer

Heat is blowing but its blowing cold air ...


Check if the engine temperature gauge indicates a normal reading. If it's normal, your heater core may be blocked, or the temperature control mechanism controlling the flap allowing the hot air is not working. If you can open up the hood and find the two hoses leading to the passenger compartment, see if they're both hot to the touch. If they are, then the doors are not moving properly diverting the air through the heater core. If it's cold then the core is probably blocked and may need replacement.

Dec 31, 2010 | 2005 Pontiac Grand Am

1 Answer

Heater will not blow hot


Top up Fluid level in over flow tank and radiator ( when cold ). Run engine to normall operating temperature and check for heater blowing hot air.Good starting point.

Dec 05, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

No heat air is blowing cold


First you have to identify what causes the problem.
To do this you have to:
1) When engine is cold check the level of coolant. If it is low fill it up.
2) Start engine and check if engine reaches regular temperature. If your engine is not heated enough it means your thermostat does not work properly and should be replaced.
3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is worm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
4) If pipe/pipes are hot/warm, turn off the fan, switch controller to the hot position, wait for 3-4 minutes and turn on the fan. Note if the cold air blows first or warm air blows first but it cools down in 5-10 seconds. If the air blows cold than it is most probably the problem with blend door or blend door actuator.
5) If air blows warm first and then cools down, then while running engine and remaining the transmission in PARKING position, press on the gas pedal until your engine reaches 3,000 RPM. Check if your heater blows warm/hot air. If it does, then your water pump does not work properly and should be replaced. If the air still cold, I would suggest to flush the heater core.

Oct 22, 2009 | 1998 Ford Taurus

1 Answer

MY 1998 FOR TARUS HEATER WILL NOT WORK.WAS DRIVING


It is most probably the problem with blend door or blend door actuator. But just in case I would suggest to follow the entire procedure:

First you have to identify what causes the problem.
To do this you have to:
1) When engine is cold check the level of coolant. If it is low fill it up.
2) Start engine and check if engine reaches regular temperature. If your engine is not heated enough it means your thermostat does not work properly and should be replaced
3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is warm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
4) If pipe/pipes are hot/warm, turn off the fan, switch controller to the hot position, wait for 3-4 minutes and turn on the fan. Note if the cold air blows first or warm air blows first but it cools down in 5-10 seconds. If the air blows cold than it is most probably the problem with blend door or blend door actuator.
5) If air blows warm first and then cools down, then while running engine and remaining the transmission in PARKING position, press on the gas pedal until your engine reaches 3,000 RPM. Check if your heater blows warm/hot air. If it does, then your water pump does not work properly and should be replaced. If the air still cold, I would suggest flushing the heater core.

Oct 17, 2009 | 1998 Ford Taurus

1 Answer

Heater not working


First you have to identify what causes the problem.
To do this you have to:
1) When engine is cold check the level of coolant. If it is low fill it up.
2) Start engine and check if engine reaches regular temperature. If your engine is not heated enough it means your thermostat does not work properly and should be replaced.
3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is warm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
4) If pipe/pipes are hot/warm, turn off the fan, switch controller to the hot position, wait for 3-4 minutes and turn on the fan. Note if the cold air blows first or warm air blows first but it cools down in 5-10 seconds. If the air blows cold than it is most probably the problem with blend door or blend door actuator.
5) If air blows warm first and then cools down, then while running engine and remaining the transmission in PARKING position, press on the gas pedal until your engine reaches 3,000 RPM. Check if your heater blows warm/hot air. If it does, then your water pump does not work properly and should be replaced. If the air still cold, I would suggest flushing the heater core.

Oct 17, 2009 | 1998 Ford Taurus

1 Answer

Heater problem 2005 grand caravan


check the coolant level, I had the same problem low coolant level.....no hot water to the the heater coil.

Oct 20, 2008 | 2005 Dodge Grand Caravan

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