A/C Question - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 2 (permalink) Old 08-19-2010, 01:25 AM Thread Starter
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A/C Question

I have a '90 D250 and I'm working on getting the AC going. The truck was converted to R134 before I got it, I don't expect this to perform miracles, just work. The system holds pressure, and is full. The problem I have is that the clutch isn't engaging. But if I jumper the compressor to 12v with the AC on, I get cold air. The fuses all seem good. Anyone know how to fix this?
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post #2 of 2 (permalink) Old 08-24-2010, 04:13 PM
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There is a relay on the driver's fenderwell that controls the A/C cycling switch/compressor. I think it is the middle one if I am not mistaken. Anyway, there are three on the inner fender, one for the starter, one for the charging system, and one for the A/C if I am not mistaken, but I don't really know because your truck is non-ic. If not that, there is a cycling switch on the firewall behind the passenger hood hinge that may be either bad, or just disconnected.

1992 W250-P-pump and some extra air, gone, but not forgotten.

2003 SVT Cobra

1984 Chevy K10

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