AC question
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Laughing Gas
Joined: Feb 2004
Posts: 1,139
Likes: 4
From: Maine
AC question
I was running my AC yesterday and it kept switching back and forth from AC to defrost on it's own. It was about 80 degrees but was extremely humid and I was towing a trailer which made the truck work a little harder but it wasn't under much of a load. Any ideas?
Post Fiend
Joined: Jan 2002
Posts: 5,859
Likes: 7
From: USA
I would say a vacu, leak or bad divertor door actuator.(going to defrost is the default when loss of vacuum occurs)
Look behind the glove box for door actuator.
chk the vacuum lines that go to the solenoid that operates the front 4x4 hubs.
Rich
Look behind the glove box for door actuator.
chk the vacuum lines that go to the solenoid that operates the front 4x4 hubs.
Rich
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Laughing Gas
Joined: Feb 2004
Posts: 1,139
Likes: 4
From: Maine
The next question is why did the AC work fine last night (about 9 hours later). I failed to mention that before. It was much cooler then and much less humid but it seemed to work fine then. After the initial problem yesterday morning, it worked fine. Beats me!
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Laughing Gas
Joined: Feb 2004
Posts: 1,139
Likes: 4
From: Maine
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Sit. Stay.
Joined: Oct 2001
Posts: 18,308
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From: Washington State
FortyFords is on the money then.
Don't know why it would intermittent unless the hose was bad and only affected by the heat/humidity.
Don't know why it would intermittent unless the hose was bad and only affected by the heat/humidity.
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According to my Ford dealer, that condition is designed into the Ex and other super duty trucks. Had same issue pulling a larger boat on a hilly stretch of interstate. Was hot, humid and AC intermittence became frustrating. Seems the Ex under heavy load will suspend AC operation for power and resume AC when on flat, downhill, or cooler. Seldom ever pull heavy so this condition is rarely a problem. Still question the wisdom of that bit of Ford engineering.
New User
Joined: Nov 2005
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From: South Carolina
HVAC Controls Going Haywire
This morning, when I started my '05 X, the HVAC controls began going haywire. I have the automatic HVAC and it was switching back and forth between low fan, high fan, AC, defrost, etc. The OFF button does not function and turning the fan down turns it up high and puts the defrost on. I see by earlier posts that it could be a vacuum leak. My X was parked so there was no load. Where should I look? MY X is still under warranty but I'd rather not take it in if it's just a loose vacuum hose...Thanks