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Ford 650/750 Medium Duties Technical discussion of the new Ford Super Duty 650 and 750 series trucks with Power Stroke, Cummins, or Caterpillar engines.

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Old 04-22-2010, 01:36 PM   #1 (permalink)
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F650 AC Problem

I have a 2004 F650 with a 5.9 cummins, the AC isn't working in fact I have no power at the compressor. We've checked all the fuses and relays we can find, I don't have an owners manual so I'm shooting in the dark, they all check out fine. I changed the control panel, because when it was cold I had trouble getting the temp to adjust, but that made no difference. Any suggestions would be greatly appreciated.
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Old 04-22-2010, 02:53 PM   #2 (permalink)
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Have you tried to jumper the pressure switch? If the system is undercharged enough the switch won't allow the compressor to run. I routinely have to disconnect it and use a jumper wire to get the compressor to operate and pull fresh refrigerant after a service. Your charge might have leaked out over time.
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Old 04-22-2010, 03:34 PM   #3 (permalink)
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Yes we tried jumping the pressure switch. Have you ran into a problem where the temp doesn't adjust properly? I just bought this truck a couple of months ago and when it was still cool I couldn't get the temp to go up then after hitting several bumps on our smooth highways it went up but then wouldn't go back down. Now it goes up but I still have trouble getting it to go down.
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Old 04-22-2010, 04:01 PM   #4 (permalink)
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No I haven't ran into that issue yet, but it seems like it would have to be in the controls somewhere. I saw in your original post that you changed the control panel. I would maybe start looking at vacum lines. Also maybe your "blend door" actuator or the door itself.
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Old 04-23-2010, 10:05 AM   #5 (permalink)
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Thanks for your help I'll see what I can figure out.
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Old 04-24-2010, 05:49 PM   #6 (permalink)
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I have seen many wiring problems on these trucks. Particularily at or about the low pressure cycling switch that is located on the suction line just behind the compressor. It is a round, black connector with 4 pins, but only two wires going in to it. Give it a wiggle and push on it with the engine running and the A/C on to see if the compressor clutch engages.
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Old 04-30-2010, 04:42 PM   #7 (permalink)
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Originally Posted by alexb View Post
I have seen many wiring problems on these trucks. Particularily at or about the low pressure cycling switch that is located on the suction line just behind the compressor. It is a round, black connector with 4 pins, but only two wires going in to it. Give it a wiggle and push on it with the engine running and the A/C on to see if the compressor clutch engages.
You hit it right on the nose!! Thanx alot, the pigtail had been replaced and it had bad connections. Again thanks for your advice.
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Old 04-30-2010, 06:41 PM   #8 (permalink)
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You hit it right on the nose!! Thanx alot, the pigtail had been replaced and it had bad connections. Again thanks for your advice.
No problem. Glad I could help.
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Old 09-22-2013, 07:07 PM   #9 (permalink)
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we found the same problem that the pigtail had been replaced, but when we tried to wiggle it nothing happened. we even tried to touch both ends of the connector with a paper clip to jump it, but nothing happened. any suggestions from here?
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