Question about 2004 Pontiac Grand Prix

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Heater stop blowing

The heater stop blowing, the faster I drive the more heat i get.

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Notorious for the blower motor resistor failing from moisture build up.Located above passengers foot well on bottom, forward side of HVAC box. NOT real fun to R&R! Good Luck.

Posted on Feb 08, 2009

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Posted on Jan 02, 2017

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Jan 27, 2016 | 2000 Chrysler 300M

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The heater on my pt cruiser says it's off but when I'm driving it's on and the faster I drive the more heat it blows out , what can I do to stop it?


Sounds as if the flapper door (blend air door) is stuck or the seal has failed. These operate by a vacuum line to an actuator which may have failed. Can be hard to access so you may need a shop manual to give help on how to fix.

Feb 24, 2015 | Cars & Trucks

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Heater blowes hot when engian is revved up


The best and faster way to heat a car up is to drive. I know that it is a cold ride but that is the fastest way.----------------------------------------------------------------------------------
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Jan 07, 2013 | 2004 Ford F250

1 Answer

03 civic heat doesn't work unless driving


no that is a water pump or a stuck thermostat. see when you are driving the coolant is going through the system which means the faster you go the faster the water pump goes and more pressure on the thermostat. you have a stuck thermostat

Dec 14, 2012 | 2003 Honda Civic

1 Answer

When the heater is on and I am driving there is heat, however, when I stop at a light for a few minutes it blows cold air. What's up?


Your coolant level is probably low. When you are driving, the water pump turns faster and pumps the coolant into your heater core. When you slow down or stop, the pump doesn't turn as fast and can't get the coolant pumped into the heater core. Eventually if you don't fill it, you won't get heat at all, and soon after your engine will overheat.

You need to check your coolant level when the engine is COLD, or you take the risk of burning yourself. Hot coolant is under pressure, and will cause severe burns if you open the radiator cap when the engine is hot.

More than likely there is a leak that needs to be addressed. Take the vehicle to a certified repair shop and they can perform a pressure test (at little to no cost) to help you determine where you're losing coolant.

Hope this helps!!

Oct 21, 2010 | 2000 Mercury Sable

1 Answer

Car heater only blows on low speed


could be something as simple as the switch or the blower motor check to make sure the switch is changing to the designated speed

Feb 20, 2009 | 1990 Ford Probe

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The heater works only when the car is moving


Check the antifreeze. You may be low.

Dec 22, 2008 | 2002 Chrysler Sebring

2 Answers

After car heats up (slow to heat) it stil blows cold until moving


You have a circulation problem, heater core may have restriction that why heat only comes when you drive ,also you may have a thermostat that stuck in the open position. Good Luck

Dec 22, 2008 | 2000 Dodge Caravan

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