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2001 Ford Windstar XL w/3800 Engine heat/ac selector switch
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Sam625
New User
Jul 11, 2010, 8:42 PM
Post #1 of 2
(5180 views)
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2001 Ford Windstar XL w/3800 Engine heat/ac selector switch
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I have a 2001 Ford Windstar Van with a 3800 Engine. My problem with it is with the heater/ac multi-function switch that allows you to select from the various settings, such as; Max A/C, defrost, vent,floor,etc. MY system is set on defrost and I can't seem to change to any of the other settings. I replaced that switch which didn't change anything. I also changed the whole switch assembly without success. The blend door is working and I'm able to change the temp of the blower air from hot to cold. I just can't get the air to come out anywhere else other than the defrosters. The blower works on all speeds. If I understand the system correctly, vacuum is used to change to the function desired, ( heater, A/C, defrost.etc. When I turn the function switch from off to anyone of the desired setting, the blower comes on, but again, the air only comes out from the defrosters. If you have any ideas on how I should proceed from this point, I would be very interested. I don't think my problem is electrical, but rather a vacuum problem, and if that's the case, where's the vacuum source. I would appreciate your opinion as to where my problem lies. Thanks.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 12, 2010, 2:55 AM
Post #2 of 2
(5169 views)
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Re: 2001 Ford Windstar XL w/3800 Engine heat/ac selector switch
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The mode selection is done through a series of air doors that are operated by vacuum. When there is either a partial or total loss of vacuum, the system will default to either defrost or on some vehicles, heat. Acceleration can also have an effect on the doors for the same reason.
Look under the hood for a small black plastic hose coming through the firewall. Follow it to the vacuum source looking for any breaks, cracks or leaks. Also follow any other lines that branch off because they may go to a vacuum reservoir (storage tank) and a leak there will cause the same problem. Using a vacuum gauge to determine if you have full vacuum at any given point is the best way to find it. You can cut into the line anywhere and splice it back together with a piece of vacuum hose. Find the broken line, you found your problem.
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