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Old 04-20-2008, 07:25 PM
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Air Conditioner

I have a 2001 F250 7.3. I have noticed that when I'm cruising down the highway or idling for several minutes my air conditioner stops cooling. When I accelerate it cools properly. I checked the charge and it shows the system is fully charged.
Any ideas?
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Old 04-20-2008, 07:39 PM
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When your idling it will stop cooling, since the compressor isn't spinning fast enough to keep everything moving at "cooling speed"
But when your crusing down the highway it should.
Maybe you have excessive moisture built up and need to have a reclaim/recharge done.
I know you said it showed "system charged" but it's just reading volume, not the type of volume, or what it is.
Sounds like a quick service where they reclaim all the r134 (and all the compressor oils/condensation/moisture) and recharge it with brand new stuff is what you need.
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Old 06-21-2008, 04:10 PM
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A/C is funny. NOT funny Ha Ha..

Mine is doing same thing, did evac. and recharge.. Checked pressure switches. What source does power come from through the switches to compressor???
By switches I mean low pressure and high pressure.........
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Old 06-22-2008, 09:04 AM
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I've noticed that its more random when it stops working, not just at low RPM's. I left it running and ran into a friends house and it stayed cool after 10 minutes at idle. Then I kicked at it the off ramp going onto the highway and in never would cool. Is there some type of temp. sensor than could be on the fritz?
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Old 06-23-2008, 04:52 AM
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Same problem

Woodall your description of problem sounds exactly identical to mine. I will do some checking on why we are losing power out to compressor, I am sure it is not a pressure problem nor the high or low pressure switches as I have bypassed them both only to have same symptoms.. If you find anything please lemme know. Thanks
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Old 06-23-2008, 08:36 AM
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check the air gap for the compressor's clutch, it may be to big and you need to remove a shim.. or the magnets could be week and not pulling the clutch to engage
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Old 06-23-2008, 06:18 PM
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No power at all.

Thanks CJ, but I am losing all voltage to the compressor as I have installed a voltmeter to clutch wires while I drive. I am going to have to trace the wiring that comes out to power up the compressor back into the vehicle. I was hoping someone had run into this before. I think there is either a thermister (thermostat) in the evap. unit or the power is applied from the ECU.. Whatever parameters satisfy the ECU to tell the a/c to kick on are maybe not being met?? I have checked the TPS and ran codes and none are set. I need to invest in a good wiring diagram for this truck.

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Old 06-24-2008, 08:45 AM
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My truck is in the body shop so I won't have it for a week or so. I'll do some checking locally and see what I can come up with. Its HOT in NC and my guys and trash talking the 250 because the A/C is acting up. I almost feel sorry for them, almost...
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Old 06-24-2008, 08:47 AM
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Quote:
Originally Posted by Cj Ford View Post
check the air gap for the compressor's clutch, it may be to big and you need to remove a shim.. or the magnets could be week and not pulling the clutch to engage
i agre , that is what i find to be 90 % the problem with a/c not cooling on these trucks , take the shim out, get the gap closer ,should fix it
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Old 06-24-2008, 09:06 AM
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My 99 has a similar problem. There is a connector that is (if your looking from the passenger side fender) is left of the dip stick. When you turn the air on it sometimes will cool, sometimes it wont. Then if you push the connector from side to side you can here a click and it will go back to working. Any ideas. It was hot on the way back from the lake the other day so I jumped out and ducked taped the he!! out of it until it stayed on. I want it fixed though
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