ACDelco Low Pressure Cycling Switch, Duramax | 2003 - 2007

Is your air conditioning working as it should? Does it seem to work fine at times yet not at all other times?

Assuming your system is holding proper charge, your problem could be as simple as this little switch. It mounts right on the accumulator, thats the large cylinder looking component on the firewall near the passenger side.

First, we are going to assume that the system has the proper level of charge in it. If operation is intermittant, read on.

If your compressor will not engage, give the switch a slight tap with a screwdriver or similer item. If the compressor suddenly starts working, your switch is likely faulty. Another simple test is to bend up a paper clip in a 'U' and jump the two terminals on the c