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Old 08-29-2007, 07:50 PM
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Help- AC control always on defrost

First off, great site and thanks for the help Iíve gotten off this site by just lurking and searching topics.

My AC on my 05 only blows cool air through the defroster. Iíve searched and read topics about vacuum leaks behind the glove box. I pulled the foot panel off and could not find a leak or kinked line. The fuses are also good.

Iím thinking that there is no vacuum present like my vacuum pump is inop. Shouoldn't I be able to feel vacuum if I pull a line off. I can't.

I think the pump is the module just behind the rt battery but Iím not 100% sure how to test it. Is there a way to test the pump to see if it is good? Is there anything else to look for?

Thanks in advance
Tim
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Old 08-29-2007, 08:01 PM
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Warranty it.
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Old 08-29-2007, 08:02 PM
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Check all the connections on the passenger side under the hood. Mine was unplugged once and did the same thing.
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Old 08-29-2007, 08:16 PM
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Originally Posted by 2005F250 View Post
Warranty it.
Thanks but I've already got 43K on it.........
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Old 08-29-2007, 08:50 PM
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There's a tsb on it. It's like a recall. I had it twice.
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Old 08-30-2007, 02:34 PM
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a tsb is not like a recall. the pump is behind the right battery, right in front of the blower motor. use a test light to check and see if you have power at the connector on the vacuum pump.
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Old 08-30-2007, 02:46 PM
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I compared my truck to similar truck at work this AM and found my vacuum pump not to be running when the comparison truck did. I do however have 12VDC at the connector so It appears the pump is bad. At $160 I wanted to be sure.

I will be picking up a new pump tonight and installing it. I'll post back results.

Tim
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Old 08-30-2007, 04:06 PM
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Originally Posted by bowtiehatr View Post
a tsb is not like a recall. the pump is behind the right battery, right in front of the blower motor. use a test light to check and see if you have power at the connector on the vacuum pump.
Yea I figured that out today. I guess it's a help line for techs. When I got my A/C fixed the first time it was I think a $120 fix but the problem was a vacuum line leak and they fixed it and said it appeared to be caused by rodent damage and I believed it because I was having a rodent problem and almost lost a wiring harness on another truck because of those bastards. But I was searching the internet and there was a TBS to fix A/C line leak under warranty because the line was routed wrong. Well I mentioned this to the service center next time I went and they credited me an oil change.
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Old 08-31-2007, 07:49 AM
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A new pump and all is good again.

Thanks again for this site and everyone who posted.

Tim
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Old 09-29-2007, 08:49 AM
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We had that problem in are 05 but we have climate control, do you
Anyway we had a fan sensor replaced an that fixed it
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