Question about 1981 Ford F 150

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Heater problems i have a 81 f15 the heater works but only blows thru dash vents no defrost i have checked all vacumes all fine i dont know plz help

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The plastic hinge on the door is broken. It cannot open and close properly. I have put a couple of small cabinet hinges on mine. A lot of work getting the ductworks out.

Posted on Nov 27, 2008

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1999 durango vent control switch will not let AC blow threw vents only defrost


Usually this is a problem with the blend doors under the dash. You either have a vac leak, a dead motor, or a faulty door.
The control opens and closes the doors to direct air thru the heater core and evaporator core along with directing air thru the vents.
When a problem occurs, the default position is the defrost vents to make sure the windshield remains clear.
You can do an internet search for "repair durango blend door" for more info.

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acuator is undrer dash behind glove compartment. Be sure your coolent level is full . does it blow warm air on long trips and does the car come halfway up the gague when running if not change thermistat if that is not your problem check vacume line going to actuator (changes positions heat defrost and vent) make sure heat control is hooked up if none of the above are the problem replace blocked heater core please check box below if helpful

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My heater will only blow out of the dash vents and won't move to floor or defrosters. Many have said to change the vacuum hoses. Can anybody tell me where to find them? Do I need to take apart the dash?


Heater flap works on vacum lines. My jimmy had same problem. Found out flap broke inside heater core. Gmc had a default. If something breaks it goes to defrost as safety precaution. Or a vacum leak in a hose to heater.

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My Defrost doesn't work


Check to see if the duct hose to the defroster vents has come loose. If air is blowing out under the dash when you have the control set to defrost, then this is likely.

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My thermostat was running low on temp.(thermostat was stuck open) at the time the heater, defrost, a.c., etc. were working. i replaced my thermostat and now my defrost is the only thing that blows. the...


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Sounds like you have a plenum door that is not opening when you go into defrost mode. You will have to check all your vacuum hoses and switching valves under the dash to see which one is not working. Hope this helps.

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The air cond blows out of the floor instead of the vents


i dont know if you have checked the vacuum lines underneath the dash but my truck was doing it after i replaced the heater core and i come to find out that it was the vacuum line that comes through the fire wall that was disconnected. after i hooked it back up it started working right again.

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