Automotive Air Conditioning Information Forum (Archives)

dickielee76 on Sat August 17, 2013 11:19 AM

Year: 2000
Make: Chevy
Model: 2500
Engine Size: 6.0
Refrigerant Type: 134A
Ambient Temp: 80
Pressure Low: 100
Pressure High: 100
Country of Origin: United States

I have a 2000 Chevy 2500 that the AC was working, then it kicked off, now it won't work at all. I've checked the low pressure switch, high pressure switch, the relay, the switch in the dash, and the cycle switch. To no avail. Still can't get the pressure to kick in.

Any ideas????

mk378 on Sat August 17, 2013 11:56 AM

Have you checked if voltage is reaching the clutch coil? It could be a bad coil, bad coil ground, or the gap is too wide.

dickielee76 on Sun August 18, 2013 9:24 AM

I have checked it where it plugs into the compressor and it is good to there. Where abouts is the ground for the coil? Whats the gap supposta be on the clutch? How do you set the gap?

mk378 on Sun August 18, 2013 10:20 AM

Test with one probe on each of the wires at the coil. One is power and one is ground and if you have 12 volts between them, both sides of the circuit (power and ground) are good.

Then unplug the coil and measure its resistance (one probe on each coil pin), which should be about 3 ohms. Open circuit means the coil is bad.

Gap should be small, like .020 inch or less. If the gap is too large but everything else OK, you should be able to make the compressor engage (once) by hitting the clutch plate while the engine is running with the A/C button on.