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Heater only works when I accelerate - 2003 Audi A4 Cabriolet

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Water pump bad

Posted on Jan 18, 2013

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Posted on Jan 02, 2017

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2005'Towncar. 40k miles. Started making an odd sound on acceleration; hard to describe but sounds like it is coming from passenger dash side. Maybe an air noise?? No sound on very soft acceleration


Turn off heater/air conditioner and accelerate briskly. If noise does not occur problem is probably a regulator in the heater/air conditioning system located under the dash.

Feb 14, 2015 | 2005 Lincoln Town Car

1 Answer

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
be gross 12 DC power issues, dead battery or, bad charge system.

Jan 07, 2014 | Suzuki Vitara Cars & Trucks

1 Answer

Heater gets cold when i stop accelerating


The coolant is probably low. Check that first, if it is full then the water pump is probably worn and not pumping effectively any more.

Dec 26, 2013 | 2001 Saturn SL

1 Answer

I have a 1996 chevy tahoe an the heat only blow out when i accelerate why is that???


Sounds like a heater core issue. The heater core my be clogged so water will only flow in it when you are accelerating. Easy way to check is to turn the heat on while the truck is running, find the two lines running to your heater core and see is both are the same temp. If the heater core is clogged then only one line will be warm/hot.

Nov 08, 2011 | 2003 Chevrolet Tahoe

1 Answer

Heater only works while accelerating


this sounds like the coolant is low and should be checked.when you accelerate the coolant flows faster through the system.when at idle or driving slow the air will accumulate at the highest point which is usually the heater core thats why when in this state you get cool or luke warm air out the vents.

Nov 01, 2011 | 2004 Jeep Liberty

1 Answer

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.

Feb 12, 2011 | 2002 Chevrolet Malibu

1 Answer

Heater goes cold, when you accelerate, it gets warm. is it the thermostat?


It is probably low level. Check it and fill it to proper level. If low, it won't circulate through the heater core, when you accelerate, the water pump speeds up, some coolant now makes it to the heater core. Watch the level to make sure it doesn't drop again, you may have a leak somewhere.

Dec 18, 2009 | 2004 Honda Civic

1 Answer

Problem with front air switching to heat when accelerating


Check for a vacuum leak. WHERE is the magic question.

Mar 26, 2009 | 1999 Lincoln Navigator

1 Answer

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.

Jan 07, 2009 | 2003 Jeep Liberty

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