defroster not working
#1
defroster not working
ok first off the truck is not a 1987 its an 86 302 it does have ac , got a slight problem the heater will not switch off of the vents wont switch to defrost or floor, i live in iowa and the defroster is a pretty critical piece if you all could give me any pointer it would be greatly appreciated
#2
Senior Member
Hi . the doors that control the direction of the air flow ( vent, floor,defrost ) are control by vacum lines . make sure they r connect it, and working wright. the lines on my 93 one its black and the other its withe.
#3
There is vacuum present I can see te vacuum motors move but no change in the direction of air, another thing is air blows harder out the 2 vents on the passnger side than on the drivers side any ideas as to how to fix it would be greatly appreciated!!
#5
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Join Date: Dec 2007
Location: Central Jersey
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behind and to the left of the glove compartment door is a wire with a looped end that fits over a plastic pin that move the vanes in the control box. See if the connector or pin is broken or sheared off
EDIT now that i think of it. the control i described is for the temperature, not the defroster,
EDIT now that i think of it. the control i described is for the temperature, not the defroster,
Last edited by A W Smith; 01-02-2010 at 01:00 PM.
#6
I know there is vacuum there I can physically watch the little motor diaphram move when u switch the control from vent to floor to whatever but the direction of the air does not change
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#8
#9
Senior Member
The wire behind the glove box tha A W Smith is talking about i think its to control the door for hot or cold. thats how my 93 f150 its. going back to bacum line if u can see the diaphram move , can u heard the doors for the air flow move.They maybe broken or lose inside or diaphrame could have a leak. disconnect the vacum lines and move them by hand and check i u can heard something moving inside