AC compressor not working - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 6 (permalink) Old 04-01-2010, 08:32 PM Thread Starter
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AC compressor not working

Anyone have experience with the AC compressor going out? I haven't turned the AC on in a few months and now that the weather is warming up I need it, but the compressor clutch doesn't engage when I turn the switch over to any of the AC settings. Have checked fuses, diode, and harness connections - no joy. Have not checked yet for power at the compressor and will do that tonight. Has anyone been down this road??
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post #2 of 6 (permalink) Old 04-02-2010, 02:45 AM
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yup been there. get your refgernt checked, if your low it will not work.

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post #3 of 6 (permalink) Old 04-02-2010, 06:40 AM
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You can check for voltage at the compressor, but if no voltage at clutch there are a few other switches that are not allowing compressor engagement. It could be low enough on refrigerant due to leak. or a switch/wiring problem.

A few of the more prone area for problems are Weak clutch field ( with eng running an a/c on tap front of clutch hub and see if it engages, or if you have power and ground at compressor then clutch field is bad) wiring at the low side cycle switch check for breaks in the wires ( seen a few broken wires with insulation still attached. Both switches in a/c system should have and flow power through them if a/c is charged ) Check for a/c line rubbing CAC tube. Check compressor for dampness/oil traces ( signs of leakage )

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post #4 of 6 (permalink) Old 04-02-2010, 10:40 PM Thread Starter
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I jumpered around the AC clutch pressure switch last night and the compressor comes on. So then using the gauge from a refill refrig can I check the pressure and there's nothing. So somehow I lost pressure over the winter and now I guess I'm chasing a refrigerant leak. Thanks for the info.
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post #5 of 6 (permalink) Old 04-03-2010, 04:11 PM
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The front seal on the compressor needs oil to work, the refrigerant pressure pushes it out so you have to run the compressor for a couple minutes every month to circulate the oil.

If the pressure is under 15# you might want to vacuum the system before recharging, you start with an accurate charge and no air.

It may have a leak someplace else - the pressure would normally go to 0.

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post #6 of 6 (permalink) Old 04-05-2010, 03:43 AM
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Yep, more than likely a leak. I suggested a few problem areas for leaks in post #3 that i have seen. If the leak is fairly fresh, or you charged it up, then look for a fluroescent green oil leaking out somewhere. If it an old leak you will usually see an oily substance/residue on the A/C components and lines. look close at the line connectors, or possible rubbing spots. front hub of compressor. Also check the condensor behind the grill, have seen rocks/debris hit the condensor causing leaks too.

My motto: Be nice, be polite, but have have a plan to kill everyone that you meet.

94 F250 IDI turbo, auto 2wd.. ATS housing, 3" down, 4" exh, guages. 104k miles got totalled by a damn mustang (parts now).

98 12v, 4x4 quad cab. auto with BD T/C & V/B, Banks Big head, Exh brake, AFC modded, 16.5ish*, KDP gone, 60lb springs, 4K-GSK, BHAF, pyro, trans, and boost guages. 4" straight pipe,

72 AM General M35A2, LDT465-1C "Whistler" Turbo, PTO winch.
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