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Old 09-01-2013, 03:48 PM
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Another a/c problem thread

99 f-250 sd cc. Ok, so I can get the compressor to power up off the battery. Can not find any blown fuses and the relay works. The hvac fan comes on in all modes at all speeds. I haven't checked out the coolant level but I did check, I believe the low side switch/bypass. When I pilled the wiring to the switch, I didn't get 12v. I am assuming the switch is the one right near the compressor. BTW, the compressor spins freely and, again, I can turn it on. So what should I do next. FWIW, I've been checking around for ideas and they got me this far. Oh, and I'm bs with electrics. I do have a battery charger, jumpers, digital volt meter w/ohms, etc.
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Old 09-02-2013, 08:05 AM
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FWIW, the heat and blower functions work fine. Also, I have checked the air gap as I didn't think that this would stop it from working all the time. And, again, I think I'm not getting power to the low side switch. Just now 100% positive what I checked was the low side switch.
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Old 09-02-2013, 10:34 AM
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Sounds like you could be low on freon
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Old 09-02-2013, 11:12 AM
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R134a kits are available at auto parts store nationwide. Get the proper oil with the home recharge kit also. Quick fix and no hazmat license required.
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Old 09-02-2013, 03:31 PM
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Check your pressure first before you just start throwing refrigerant in. If you are low you need to find the source of the leak then repair it. Then evacuate & recharge if you had to remove refrigerant (legally you have to recover it)or if it was flat.
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Old 09-02-2013, 04:15 PM
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Also you have a low pressure switch,refrigerant containment switch, then from the PCM is the head pressure switch & clutch relay. So there's quite a few other electrical devices keeping it out.
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