Question about 1997 Ford Thunderbird LX

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Heating and defrost unit does not work but its getting power

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Air Temperature Control Blend Door Failure No Heat or no AC (dependes on where door sticks) This is well documented problem on this make and model.

In all modern cars there is a tiny DC electric motor driven gear drive that moves a plastic door that blends heated and cooled air from the AC and the heater core, this is called (interestedly enough) the air temperature control blend door actuator. The motor that moves this door fails because the door starts sticking from warping, most common complaint is no heat but it can be no AC as well. To replace these parts (blend door and blend door actuator) you must remove the entire dash from the car. Always have this problem confirmed by a dealer or qualified repair shop as it is a very expensive repair.

Other causes of no heat in the cabin are engine thermostats that are stuck open (engine runs cold) or air bubbles in the cooling system.

Posted on Nov 08, 2012

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Posted on Jan 02, 2017

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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.

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Most heater units default to defrost mode for safety reasons. If you have a vacuum activated system you have lost vacuum some place causing unit to default to defrost. Check engine compartment vacuum lines and bottle reservoir for leaks.

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1999 gmc sierra no heat in defrost but heater and A/C work


Is this a new body-style 99? The electric motors that control the doors inside your heater unit are prone to failure. Your best bet is to have a qualified technician take a look at it. A good scanner will show which motor is bad.

Jan 27, 2013 | 2003 GMC Sierra 1500

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Blower work fine but still dont get no heat or defrosters could use some help thank you


It sounds like your heater controls are not working. They are usually operated by a vacume line. check under dash passenger side behind glove box for the vacume line disconected ps check engine side first its easier. if vacume line is good chech vacum at heater box their is a meatel vacume unit that opens and closes the heat and defrost doors. if your heat is only comeing out of the defrosters The doors under the dash are not opening and closeing. ChecK the metal vacume unit . A vacume pump can be purshed at parts store some have a loner program.

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AC and Heat/Defrost only work on highest setting; and heat gets way too hot. Any ideas? Is it the blower or something?


Sounds like your blower motor relay. Look on your unit housing (under the hood), there should be a plug, disconnect it, find your power lead and use a jumper to different posts. You'll know as your fan speed will change. Hope this helps

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2 Answers

No power to heat and air panel..but heat still works as if it was stuck on defrost. blower fuse is missing will replacing this make panel work agian?


This is a good possibility. When the fuse and or the switch resisiter goes faulty the system will default to a single speed defrost only...

Dec 10, 2009 | 1993 Eagle Vision

1 Answer

Is the correct name for the part that controls the air flow from a/c to defrost called the A/C Heating Servo Unit, the defrost does not completely defrost the front windshield but the a/c works just f


Well it would be the "mode door GM pt#88986538" or the "mode control cam actuator GM pt#89023358" on the side of the heater case. The door would control where the air comes out and the actuator tells the door where the setting is at on the control head.

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1 Answer

Heat or air only comes out from window defrost.


try changing your whole heater switch unit that should work

Dec 09, 2008 | 1997 Chevrolet Blazer

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