I've been trying to diagnose my AC problem. When I turn on the AC
switch, I get fan but no AC. The compressor clutch does not engage. I
disconected the compressor power source, applied power to it and could
hear the clutch click/engage so I think the compressor works but is not
getting any power. I checked and changed the fuses. I assum power
goes straight from battery to dash switch then to complressor but can't
figure out where the problem may be...any thoghts would be greatly
appreciated. I have a 1999 Ram 1500. Thanks
Do you have gauges to check the pressures? If not, pull the low pressure
switch connector off the accumulator (round cylindrical-looking thing close
to the firewall on the passenger side, with A/C lines running from it), and
jumper the two pins on the connector. With the engine running, and the A/C
selected, if the clutch engages, you're low/out of refrigerant (or have a
bad low pressure switch - but most likely the refrigerant leaked out).
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.