heat issues
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Junior User
Joined: Oct 2010
Posts: 75
Likes: 3
heat issues
everything works, all vents and controls work but only blow cold air. truck gets up to normal temp no problem. had the issue last year and fixed by changing the control unit. Its been fine since up until the other day. The control **** for "hot/cold" seems like it spins very easy, like theres no resistance when you turn it. I think it was that way last time I changed it to but I dont remember.
I tried searching but couldnt find anything similar.
does this sound right?
I tried searching but couldnt find anything similar.
does this sound right?
Hotshot
Joined: Jul 2005
Posts: 11,931
Likes: 180
all the vents and air flow are controlled by vacuum cylinders. The "heat" is controlled by the **** that sends a variable electrical signal to a motor that moves the mixing door in the duct to mix hot and cold air. You can have a bad electrical controller, bad motor, bad gearbox on the motor, or bad duct door .
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Junior User
Joined: Oct 2010
Posts: 75
Likes: 3
I replaced the heater/a.c. control unit and nothing has changed. I ran to full temp and thermostat opens, water pump works, no leaks.
does this all mean its a bad duct door? from any posts I read that seems like its a pita to fix. how much would I expect to pay to have it done? I really don't have the time to get into it right now myself.
does this all mean its a bad duct door? from any posts I read that seems like its a pita to fix. how much would I expect to pay to have it done? I really don't have the time to get into it right now myself.
Thread Starter
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Junior User
Joined: Oct 2010
Posts: 75
Likes: 3
bad duct door... quoted $700+ to fix. I know I could do it myself but I don't have the time so my loss is their gain on this one. 
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Postmaster
Joined: Nov 2006
Posts: 4,517
Likes: 3
From: SE Wyoming
I assume they have to remove the dash for that price, if so I'd have the heater core done at the same time.
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