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Heater blows only cold air even after being on or idleled for a long time

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You most likely have one of the following going on, a sticking or frozen air temperature control blend door or the motor that moves it is defective or in most cases both parts are the problem. Next you need to check and see if the heater core has flow, heat up the engine and touch the two small hoses going to the heater core at the firewall under the hood from the engine, one should be really hot and the other not so much, if this is the case the heater core is fine.

Posted on Dec 08, 2016

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Posted on Jan 02, 2017

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SOURCE: Heater blows cold air

change the heater core

Posted on Dec 21, 2008

  • 11 Answers

SOURCE: Heater blows cold air unless accelerating

1.maybe your thermostat is no opening or closing.
2. not enough Ant-Freeze
3. Low on water

With more details on the engine i may be able to help you more. for example what is the temp reading after it idles awhile or does it blow warmewr when driving ?

Posted on Dec 30, 2008

alicantecoli
  • 22219 Answers

SOURCE: Ford Expedition 2002 Front Heater blows cold air below 45 MPH

impeller is made of plastic on teh water pump and its slipping and spinning on the shaft renew before weather warms up as engine will overheat

Posted on Jan 01, 2009

  • 1 Answer

SOURCE: Heater blowing cold on 2005 Nissan Xterra

I live in Alaska and have had the same problem i just added more coolent to the radiator and it warmed up i installed a block heater and i leaked a bit and the coolent level got low and i would have no heat. I tryed to fill just the coolent resivoir and that dident work so i filled the radiator pumb full and that worked!! Hope this helps.

Posted on Jan 18, 2009

  • 1 Answer

SOURCE: heater not working it is blowing cold air at all times is there a

Heater blowing cold air until I get on the interstate, then it works; however, when I stop at lights it starts blowing cold air again. The temperature gauge will be in the middle but the car will still be cold until the car starts moving.

Posted on Jan 04, 2010

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Blows cold air turn heat on


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    ... Cadillac, Chevrolet, Chrysler, Dodge, FIAT, Ford, Geo, GMC, Honda, Hummer,Hyundai, Infiniti, Isuzu, Jaguar ... I'll turn up the temp on the dual control to get heat,

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1 Answer

Car heater blowing hot air all time


THE HEATER CONTROL CABLE, VALVE, OR SOLENOID IS STUCK OPEN......LETTING COOLANT INTO HEATER CORE AT ALL TIMES
FIND BAD COMPONENT-REPAIR

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My heater is blowing hot air even on cold setting or with ac on


you have a leak in the vaccum line,or the heater control switch is suck.

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It sounds like you either have bad controls or stuck dampers in your vents. The stuck dampers are usually caused by plant debris getting in to the air system.

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Heater blowing cold air until I get on the interstate, then it works; however, when I stop at lights it starts blowing cold air again. The temperature gauge will be in the middle but the car will still be cold until the car starts moving.

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Ford ka heater blows hot air all the time


Taurus does not use a heater control valve. It runs coolant thru the heater core constantly. You may have a temp blend door actuator problem or a plugged up heater core is also very common. Feel the heater hoses, they should both be very hot, it one is much cooler; you can try to back flush the core.

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1 Answer

Intermittant 1991 Corolla heater failure


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