[CREWZIN]

Originally Posted by calflan

When the HP switch cuts out, any cold flow in the lines is locked there and freezes ?

From a search: A high pressure switch disconnects power to the compressor clutch if the pressure gets too high. This can happen if you have electric fans and they stop working or if the condenser is clogged with bugs or anything else you may have picked up while driving, such as a piece of newspaper or a plastic bag. Of course if any of these have happened you will have a high engine temperature too. You can bypass the high pressure switch just to see if it is faulty. If it is, then the clutch will engage when you turn the a/c on and you need to replace that switch. DO NOT try to fun the system without a working high pressure switch as this can lead to very expensive problems such as blown hoses and compressors.