(Home) Aircon clutch

Having trouble with air con clutch has fried a couple because of slipping when re starting (after high pressure switch turns it off I suspect) checking the system it appears the rear temp sensor behind the radiator cap clicks the valve at the rear of the compressor (what is this valve a pressure relief ?)
The condensor fans switch to high speed when the pressure switch in front of the radiator turns on master ace 4x4 manual.
Just returned from trip to Adelaide for (Bay to Birdwood run some 1400 pre 1950 vehicles) live in Brisbane some 5,000 klms hot and dry hrd motorcycle in back no overheat problems have thermostat removed completely, temp gauge mod original fan.

- (#5937) Ron Hewitt, 25 Oct 02