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AC Issue - No Power
I've searched and wasn't able to find a thread that matches my issue exactly.
The AC started fluctuating between cool and warm. I was assuming low on refrigerant. I put my O'Reilly special can with gauge on the low pressure valve and the gauge read in the green (~35psi). At this point I noticed that my compressor clutch was not kicking in. Assuming a bad compressor/clutch I replaced the compressor with a new FoMoCo unit. Now all I get is hot air. I checked the voltage at the pigtail for the compressor and I have zero volts. I have checked the AC Clutch relay (#30) as well as the AC Clutch Feed fuse (#47) and both of those were good. I have checked the volts at the High Pressure switch and had readings of 4.9v, .02v and .02v. Mind you, this was tested with the power on and the AC blowing, but the truck was not running due to the proximity of my hand to the belt and pulleys. Does the truck have to running to get power to the switch? If not, why wouldn't I be getting power?
It got dark and couldn't immediately locate the Low Pressure switch. Anyone care to give me some insight as to where it might be located?