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Heater (blower) Issues


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gigirl
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Apr 13, 2012, 8:03 PM

Post #1 of 2 (563 views)
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post icon Heater (blower) Issues Sign In

2002 Ford Explorer
When I turn the heat on (for feet) it is blowing out through the defroster?
Is there a quick fix for this and where do I even begin to look?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Apr 13, 2012, 8:15 PM

Post #2 of 2 (558 views)
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Re: Heater (blower) Issues [In reply to] Sign In

 
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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