Question about 2002 Mazda 626

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Heater will not heat up except on acceleration

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You have a fan belt slipping past waterpump and/or a bad waterpump

Posted on Jan 02, 2011

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1 Answer

Every thing on my heater works except no heat


check that the control module is actually turning on the heater control to allow coolant to flow through the heater core. Check that you do not have an air lock into the heater.

Feb 14, 2014 | Dodge Stratus Cars & Trucks

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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.

Jan 07, 2014 | 2009 Ford Focus

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No heat in car


During accelerations the engine needs all the vacuum that it can develop. If you have a vacuum powered heater/ Ac unit you also have a vacuum reservoir that maintains vacuum to your heater unit during accelerations. This bottle has a leak. This should cause your unit to go to defrost though.

Nov 14, 2013 | Mercedes-Benz 420-Series Cars & Trucks

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My 2005 Suburban only blows hot air when accelerating.


does it ever overheat? (waterpump or thermostat)

Possible clog in heater core or pinched heater hose under hood.

If coolant/water is at proper level, and you don't over heat, the later will most likely be the issue.

Heater core is small radiator deep inside under the front passenger dash and is rather hard to access.

If you smell something like coolant inside, this is for sure the issue.

Hope this helps.

Dec 10, 2012 | 2006 Chevrolet Suburban

1 Answer

2003 Z4 Heater stuck on full heat.


take the heater apart and then you might be able to fix it that way if that doesnt work then take it to the shop

Jan 09, 2012 | 2003 BMW Z4

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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

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2006 dodge grand caravan heater only blows warm air when i am accelerating


With the engine cold check the coolant level. Add as necessary. If the coolant gets low enough the first thing to stop working is the heat. Accelerating will push coolant into the void and provide heat until you slow down and then the coolant drains back into the motor.

If you have lost enough coolant to loose heat there is a leak. Some common areas are the rear heater lines under the passenger side of the van, the water pump, and the radiator.

Dec 14, 2010 | Dodge Grand Caravan Cars & Trucks

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Why my 2006 impala heater blows cold air in park or stop light, but blow fine when accelerating.


have you checked coolant? if it is low will do this. if full then probably heater core restricted need to back flush core

Feb 18, 2010 | 2008 Chevrolet Impala

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