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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I have a 1999 merc sable that will not blow hot air. A/C works fine. Replaced the Radio, Heater, A/C control panel with no help. i think it is the heater control valve but have no idea where it is. The...

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

Nov 27, 2010 | 1999 Mercury Sable

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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.

Nov 26, 2010 | Chevrolet Beretta Cars & Trucks

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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.

Nov 22, 2010 | 2001 GMC Jimmy

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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.

Dec 13, 2009 | 2003 Chevrolet Silverado 1500

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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...

your blend doors work off of vacum, check vacum line under hood close to firer wall ( there should be 1 vacum line that goes into the firer wall ) check it for vacum.

Nov 20, 2009 | 2006 Chevrolet Astro

1 Answer

A/c and heater only blows thru defrost and side vents

your a/c and heater blow thru the defrost ( top of dash? ) and the vents. Or defrost/or the vents.? and not on the floor? Well all of these should work. can you hear the motor inside the dash turning to they're perspective spots on the dial the motor pulls a cable and closes or opens appropriate doors as the selector switch is moved. if not the switch may be faulty. and you can get it from a parts store or dealership. CK the parts store's first they will be cheaper and will be able to give you a look at what needs to be done to replace it. But it can be done on most "fine " cars in 20- 30 min with minimal hand tools.

Mar 26, 2009 | 1998 Mercedes-Benz C-Class

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Defrost blows cold air

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.

Jan 18, 2009 | 1998 Ford F150 Regular Cab

2 Answers

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.

Aug 12, 2008 | 1998 Dodge Dakota

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