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Join Date: Apr 2016
Location: Norf TexASS
Posts: 6,850
Hey Jeff,

Griff's system probably means you have a high-side, high/low pressure switch, so if the refrigerant pressure is too low (if there is a leak somewhere that allowed refrigerant out), the switch will block current to the compressor clutch.

Find the switch and then jumper it (probably close to the high-side port on the compressor) - if clutch comes on, then you know that it is either a bad switch or low charge level . . . can't really tell which without putting gauges on the system.

If clutch doesn't engage, unhook the lead to it and test for current there (whatever your running voltage is), with switch still jumpered and then with switch hooked up as normal. If there is current there, then you know that there is a problem with the clutch (not likely, however).

Don't drive around with switch bypassed, as low charge running will damage the compressor, but not a problem for brief testing purposes.


When you say "red relay", are you referring to the one in the smuggler's box (probably not, as those aren't red). If that relay eff's up, the clutch won't engage (no power to it), butt usually the evaporator blower won't run,either. Butt regardless, find that relay, and tap on the case with a screwdriver handle, etc. - if the points inside are stuck, then tapping might free them up. If it does, then you can open the relay and clean the points, or buy a new one.

Last edited by Rawknees'Turbo; 07-20-2017 at 01:51 PM..
Old 07-20-2017, 01:49 PM
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