LS1GMCTruck

iTrader: (2)

Sanden compressor system cycles on & off constantly(every two seconds) one day...another day, the compressor NEVER shuts off? Looking at the compressor in the driveway with the hood up, waiting for it to just blow up! Either way its running, the A/C is cold. Thermometer in dash A/C duct says 60degrees(its 90+ outside). Small port/hose coming out of compressor going forward to condenser(w/oriface tube) VERY HOT. ALL other hoses/fitting are freezing cold, including dryer on firewall. Has new trinary F-Body three prong pressure switch in system. New dryer. New vacuum & freon charge. Any ideas? Thanks

ls1nova71

iTrader: (4)

Do you have a fan on it? Is it running? Sounds like your building up too much head pressure if its cycling on and off like that.

01WS6/tamu

iTrader: (37)

It's cycling on high head more than likely. You need to throw a set of gauges on it and see whats happening. Then go from there.

LS1GMCTruck

iTrader: (2)

I'm thinking it needs a new oriface valve, which is at the condenser, on this truck. Dang, I have to pay a shop again, to evac, trouble-shoot, recharge the system, just cause I neglected to put in a new oriface...crap! Another C-note! I could just spend that money on a set of gauges & hoses & freon like suggested...hmmm. Fans are working. Thanks for the ideas guys.