Heater control function
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Junior User
Joined: Mar 2002
Posts: 52
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From: Bemidji, MN
Heater control function
I need some help! I have a 1986 F-250 Ext. Cab 4x4 that has A/C and I can't get it to blow heat on the floor or out the vents, only defrost, I looked under the dash and noticed that the function control has no cable. Is it run solely off of vacuum, or is there supposed to be a cable?? I have a 1984 regular cab sitting here with out A/C and it has two cables, one for heater control, and one for the heater function. I have never messed with something this new under the dash so I don't have a clue. PLease, Please HELP!?!Leonard Bode
1990 F-150 4x4 302 auto
1986 F-250 Ext. Cab 4x4 400 auto
Posting Guru
Joined: Sep 2003
Posts: 1,192
Likes: 1
From: lino lakes, mn
yes vacum is user for mode controll look under the dash there is a vacum motor (diapram)down there see if it is working when you move the heater control.But they usually use defrost as a neutral position so check the movement of the door and motor sounds like somthing is blocking it
