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My heater is stuck on defrost - 2004 Chevrolet Silverado

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You have a vacuum leak good luck finding it you are better off taking it to a dealer

Posted on Oct 08, 2009

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Selector for air mode stuck on defrost


This is caused by a low engine vacuum, the engine vacuum is low when you accelerate, the HVAC system loses vacuum to the mode control vacuum switch and defaults to the defrost ducts for safety. You likely have a leaking mode control vacuum switch in the control panel of the heater AC system (HVAC).

Jun 16, 2016 | 2001 Ford Windstar

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1986 Chevy Nova - the defroster/heater vents stopped working. Any ideas? Before they found the found the fuel filter, they messed with the air filter. Could that be the problem?


If the air vent mode doors are vacuum operated, (though some are cable operated), they could have disconnected a vacuum line from engine. A vacuum diagram sticker should be located under the hood. The a/c hose will be listed as (HVAC hose).

Jan 15, 2014 | 1986 Chevrolet Nova

1 Answer

Heater is just warm, when you turn on the defroster on high takes a long time to defrost. I have had the car since 2007 and this is not normal. p.s. already changed the thermastat


You could possibly have a bad heater control valve if the car has one. Another item maybe a stuck or faulty blend air door. This would be the actuator most likely. It may not be shutting off all the way to allow complete heat through. The other possibility is a partially clogged heater core.

Nov 13, 2013 | Saturn SL Cars & Trucks

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Air conditioner switch is stuck in defrost position what to do


Problem is usually a stuck or faulty blend door motor under the dash.
The blend doors direct air thru the heater and ac evaporator as well as the vents.

Sep 22, 2012 | 2001 Chevrolet Silverado 1500

1 Answer

No heat no defrosters


Your thermostat is stuck, or your antifreeze is low, or your inline heater core valve is stuck closed. Has to be one of those three. Check the antifreeze first. If full, check the heater core valve. then the thermostat.

Mar 30, 2012 | Cars & Trucks

1 Answer

MY 1995 FORD MUSTANG 3.8, THE HEATER STOPPED WORKING ON ALL SETTINGS, FROM FLOOR TO DEFROST ETC. THE HEATER WORKS ONLY ON DEFROST, ITS LIKE IT DEFAULTED TO DEFROST, BECAUSE IT DOSENT HAVE TO BE ON...


Your blend door is stuck. The bled door is vacum operated. Make sure there are no broken vacum hoses under the hood. If that is okay then your hrad unit may be bad, or your blend door may need replacement.

Dec 01, 2010 | 1995 Ford Mustang

1 Answer

My heater is stuck on defrost. I switched the


look under the hood on the passenger side for a broken vacuum line. this is usually a white plastic or black plastic tube. you can splice it together with a small rubber vacuum hose.

Feb 10, 2010 | 1995 Ford Econoline

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When i have the heater/defroster on the heater below blows cold air while the defrost blows hot. when i switch to just defrost the bottom heater stays on and blows cold air. when i have front dash and...


It sounds like you have a blend air door stuck. This is in the housing of the heater a/c blower unit under the passenger side of the dash. There is a motor on the top of the housing that could possibly be stuck or on working.

May 10, 2009 | 2003 Dodge Durango

1 Answer

HEATER STUCK ON DEFROST


Check for vacuum leak at recirculation door under the hood. It is white in color. Find some vacuum hose at a parts store that wil replace the broken hose.

Jan 31, 2009 | 1992 Ford F250

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