I'm having a frustrating time trying to figure out what's causing my climate control fuse to blow (25 amp). I recently converted my AC system to R134a and charged the system. Everything was working fine. The AC was nice and cold, the compressor was cycling properly, and the pressure was rihgt where it should be. Then for no apparent reason the fuse blew. We traced the problem to the low pressure cycling switch on the filter/dryer. When the plug was removed the fuse didn't blow. We replaced the switch and the system worked again. Then out of the blue it started blowing it again. We tried unplugging the high pressure switch and plugging in the LP switch, and the fuse still blows. We are getting a ground reading from the blue wire going into the LP switch, obviously this is our problem. According to the wiring diagram the blue wire then goes to the HP switch. Has anyone had a problem similar to this? Does the blue wire go anywhere before the HP switch? I'm stumped.

 

Problem found! The connector on the engine side of the heater box was melted, which caused an intermitten ground at the cylcing switch and the HP switch. I cut out the bad connector and added a new GM Weatherpack connector. Everything works 100% again. No bi deal now, but this summer I'm going to love having my AC working!