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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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?

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03 civic heat doesn't work unless driving

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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.

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

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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

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