Ac problem

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Aug 21, 2014 | 10:01 PM

bigredtruckmi

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From: Huntington Indiana

Ac problem

We have a 04 F250 crew cab xlt short bed 4X4 with 6.0 engine. When engine is off for a period of time and the ac switch was left on. The air comes out of defrosters for about a minute then switches to ac ducts. Another problem that happens when we stop for stop sign, the ac starts blowing warm air until we get back up to speed. I suspect a vacuum problem on first item, but where to start? Second item - low freon ?

Aug 21, 2014 | 10:11 PM

9228.bobcat

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From: missouri

Pretty normal on these trucks. Might check the pressure. To low could cause it but to high will as well. Orfice might be getting plugged.

Aug 22, 2014 | 12:52 PM

69cj

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From: Middle Tn.

I would have the ac pressures checked first and if good start looking for a minor vacum leak. If it wasn't a minor leak it would default to defrost at all times.

Aug 22, 2014 | 01:18 PM

Money-Pit

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From: SW Florida

Quote:

Originally Posted by 69cj

I would have the ac pressures checked first and if good start looking for a minor vacum leak. If it wasn't a minor leak it would default to defrost at all times.

Ditto...check rubber vacuum connectors for small leak.

If A/C high and low pressures check good...check engine fan speed at idle.

Although not recommended....I have had vehicles with the same "warming" issues at a stop before, and adding a can of refrigerant fixed it.

Aug 22, 2014 | 02:34 PM

69cj

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From: Middle Tn.

Quote:

Originally Posted by Money-Pit

Do not just add a can to this system without gauges. It is very finicky.

Aug 22, 2014 | 07:08 PM

cheezit

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From: N. Fort Worth, tx

Look for lines freezing up and developing ice.
Check heater control valve

Aug 22, 2014 | 08:34 PM

bigredtruckmi

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Joined: Jan 2005

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From: Huntington Indiana

Quote:

Originally Posted by cheezit

Look for lines freezing up and developing ice.
Check heater control valve

Thanks will check on Monday. We have a wedding tomorrow to be at by 2 pm

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Aug 23, 2014 | 06:28 PM

Bullitt390

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Joined: Aug 2001

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If it's taking while to go from the default of defrost to the other vents you either have a small vacuum leak or the vacuum pump is getting weak.

Josh