heater defrosted controller help
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Freshman User
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heater defrosted controller help
Need a little help have a 97 f150 and lost the control of the selector switch. Can't switch between the panel defrost and blend functions my temp controlled still works fine just can't put air on full windshield defrost any ideas.
Fleet Mechanic
Joined: Jul 2003
Posts: 1,572
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I would still check the check valve and the tubing associated with it, lot easier to get to that than go under the dash, the switch is a ported switch that moves the vacuum from one damper to another, usually what breaks is the **** or switch stem. Do you have a hand operated vacuum pump?
Hotshot
Joined: Jul 2005
Posts: 11,932
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there are 3-4 different vacuum cylinders on the system to open and send air to defrost, dash, floor, or a combination of the above. If you loose all vacuum the cylinders close and you get defrost only. I dont understand when you say you dont have full defrost ? Unless the doors broke off the cam, the system defaults to DEFROST.
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Ok in truck now controller apart everything works act side. Turn the dial to panel&floor get panel for sure don't feel alot of floor. Move switch to floor and get defrost and for the floor/defrost no sound change then to all defrost again no noise change. So the floor solenoid must be bad correct
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Fleet Mechanic
Joined: Apr 2008
Posts: 1,724
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From: Vancouver BC Canada
Pull the selector **** off and check that the post isn't stripped or the **** female side isn't cracked. both things happened on mine.
Replacing the control unit solved my problem. $10 at the pick'n'pull. Good luck.
Replacing the control unit solved my problem. $10 at the pick'n'pull. Good luck.
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Freshman User
Joined: Oct 2013
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Switch is fine pulled the controller that is by the gas pedal the yellow and blue lines go go it worked ok with hand pump took a little getting back on but works fine now maybe it just came unhooked or was little stuck and the hand pump loosened it up. But it works thanks everyone.
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Shawns Fords
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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Dec 14, 2011 04:23 PM