Question about 2000 Chevrolet Tahoe

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Heater doesn't work unless accelerating. What could be wrong?

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Waterpump is not circulating the rad fluid to the heat exchanger in the HVAC. When you accel the pump turns faster.

Posted on Apr 23, 2010

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Posted on Jan 02, 2017

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1 Answer

Only blows heat when accelerating


the ac core only blows cold air but You must be talking about the heater core.. In which case I would suggest that you bleed the air out of the coolant system as there is an air lock in the heater core.

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Heater works only when accelerating


weak engine, heat, engine coolant must be 180F or more at all times
hot. if not the heater will be weak.
unless you failed to notice the heater fan speeding up. that would
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Heater doesn't blow hot air


Hi Tamara,

Please review the following article to get an idea of what could be wrong with your heater.

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Nov 29, 2011 | 2001 Lincoln LS

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The wrong antifreeze was put in my car. It had gotten gummy and I had to get a power flush so it would stop over heating. Since then my heater has stopped working which i figure the heater core will need...


If I may ask, what color was the antifreeze that you took out of your car? If the coolant is not actually overheating, the coolant temperature sensor could be bad. Check the routing of the serpentine belt. It is possible to get the belt on wrong and turn the water pump in the wrong direction, which would cause overheating because the coolant would not be circulating as it should. That would also prevent the heater from working since the coolant would not be flowing through the heater core.

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I have a 2005 Nissan sentra and the heater wont stay warm unless i am accelerating. The AC is doing the same but in this case it does not stay cold unless i am accerating. I was thinking of changing out...


It sounds like your fans are not operating properly. When u accelerate cool air is forced through the radiator & condenser which can cause that problem , u can change the thermo. for maintenance anyway. Use fresh 50/50 coolant mixture. Ck those fans

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Heater core on a 2003 jeep liberty limited


sound like th efan is not working, not the heater, acceleration cause the air to move through the vent, so if the fan is not working, there is nothing to move the air, even the heater is working.

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