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Heater how to shut off heat/defrost manually

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You probably have a stuck blend door under the dash. Depending on the year and model it could be controlled by vac or a small electric motor.

Posted on Jul 21, 2013

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Posted on Jan 02, 2017

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Heatdoesn't work, A/C blows out warm air and defrosts blow out cold air


Right think the problem is the heater core is blocked with corrosion ,now remove the bottom hose from the rad and the heater hoses then flush every which way you can including through the heater core reversing direction then ,refit all the hoses fill with water only and see if heater works if so the remove the bottom hose again and drain ,then add a minium of 3 litres of antifreeze ,its a anti corrosion agent as well as antifreeze and without it the internal of the engine will corrode and the slurry will block the heater first then the radiator ,

Jan 04, 2014 | 2001 Dodge Stratus

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Jeep liberty heater/defrost


check the actuator motor or motors on the heater. It is inside on the base of the heater and directs the air where you want.

May 09, 2017 | Cars & Trucks

1 Answer

2012 jeep liberty heater


If you find that the heater control is a problem then until you get an answer, try running the ac unit as well. It will dehumidify the cab air ( no fogging windscreen ) keep the cab at a reasonable temperature . In most cars it is referred to as climate control . Control is by the heater knob as to how hot you allow the heater to get

Nov 30, 2013 | Jeep Cars & Trucks

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

1 Answer

2002 Ford Taurus has no heat. Water pump,thermostat,blower motor, the blend door and actuator are all OK. Both heater core hoses are hot. Clamped bypass hose shut. no heat, car did not over heat.Ac does...


Well the default setting for the a/c is defrost, and I might be mistaken on this but I think that bypasses the heater core from the blower motor to the defrost vents. Could there be another door in the heater case, I guess is what I'm trying to ask. Something in there left over from the old a/c days?

You hear the blower motor on fast and furious? Any chance the fan blade assembly came loose on the motor shaft?
If the doors are vacuum operated, a hand vacuum pump might help you. Also check if the switching controls for the vacuum signals are not linked to the unplugged a/c wires.

Oct 31, 2013 | 2002 Ford Taurus

1 Answer

When I turn the heat or defroster on I get a sound like a belt is being started it will run and then shut off then run and shut off. If I am not using the a/c, heater or defroster there is no sound


the a/c compressor will run anytime the heater is in the a/c or defrost position or if there is a switch for the a/c anytime the switch is one.

The a/c compressor should turn on and off periodically. If it is switching on and off every couple of seconds than there may be an issue with the a/c system.

Feb 08, 2012 | 2005 Ford Taurus

1 Answer

2000 chevy astro cargo van. the heat registers on the gage but little comes out and only out defrost. thermostat????


If it is blowing hot air out of the defroster and not out of the heater vents then the door that directs the heat from the defroster isn't working properly it is blocking the heat from going to the heater vents. Also check the cold air door. It sounds like it isn't closing all the way to shut off the cold air and not letting the hot air pass.

Oct 06, 2009 | 2000 Chevrolet Astro

2 Answers

Heater/AC fan won't operate


your blower motor has gone bad and it over heats and shuts down

May 31, 2009 | 1996 Buick Riviera

1 Answer

Heater is blowing luke warm heat


Double checking, does fun shut off when switched to heat instead of defrost?

Jan 24, 2009 | 1993 Ford Ranger SuperCab

1 Answer

How can I locate the blend door for the heater/defroster


Well FOR THE FIRST PROBLEM YOU PROBABLY NEED TO REPLACE THE THERMOSTAT IT IS MORE THAN LIKELY CLOSED SHUT NOT LETTING COOLANT INTO THE BLOCK TO CIRCULATE THE HEATED COOLANT 2ND THE UNIT IN WHICH CONTROLS THE TEMPERATURE OF THE INSIDE OF THE VEHICLE IS OR MAY BE BAD I WOULD START WITH THE THERMOSTAT FIRST BEING THIS IS USUALLY A MORE COST AFFECTIVE SOLUTION GOOD LUCK!

Nov 21, 2008 | 1998 Chevrolet Blazer

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