AC pumping while heater is on
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New User
Joined: Jan 2010
Posts: 15
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The other day I was turning the temp **** from hot to warm & back over & over, & the thing was working perfect. I just don't understand. Whatever it is, it doesn't seem to be a "broken" piece. That metal bar in the pic above is not what controlls hot & cold. It directs flow between floor, dash & de-frost. That system is vacuum.
From what I've read on other threads was the "temp" blend door is drivin by a electric motor with slow / low gearing. (servo) . Figuring this out doesn't help though. If anyone has a diagram of the system it would realy help. Probably just show me that all the parts are soo lost in a jungle of dash wire & plastic, I'll take it to the dealer. BUT> at least I'll understand the system & parts . Knowlage is one way not to get smoke blown up your *** at the dealer.
From what I've read on other threads was the "temp" blend door is drivin by a electric motor with slow / low gearing. (servo) . Figuring this out doesn't help though. If anyone has a diagram of the system it would realy help. Probably just show me that all the parts are soo lost in a jungle of dash wire & plastic, I'll take it to the dealer. BUT> at least I'll understand the system & parts . Knowlage is one way not to get smoke blown up your *** at the dealer.
Cargo Master
Joined: Jan 2009
Posts: 2,800
Likes: 31
From: OKC, OK
By the way, the compressor will run in ALL positions if you have the therm in the blue. It pumps harder in AC & max AC, but it pumps in all the positions reguardless, as long as your in the blue. I guess that's why I'm thinking it's the therm dial. But I dont know if the therm dial controlls a seperate door. If so I think that's the door thats on a electric motor & very low gear driven. That's the one that when it gets "stuck" the low gear ratio tears the (rod) or whatever, off the door & your stuck where your stuck. Mine goes back & forth. If it was stuck, I'd be stuck in -1- position. I read a thread from one guy who had that problem & took it all apart & had to epoxy the leaver back on.
Senior User
Joined: Mar 2003
Posts: 274
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You need to replace the blend door motor, it's not a hard job and only a Ford part. I had to replace mine a few weeks ago. If you look at the picture to the right of the vacume pot it is the white thing with the wires running to it. It,s around $78.00.
