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I went ahead and replaced the fan clutch yesterday. It is a real simple task, and pretty cheap. It has not been hot yet so I don't know if that made any difference at all.
The system is still R-12 and is the typical GM CCOT style system. The low pressure switch is attached to the accumulator and I will have to check the specs but as I remember it cuts off the compressor in the 30 to 35 PSI.
I did get the second relay installed yesterday. Now the fan will ONLY come on when the compressor is running and the brakes are on. I still need to find a relay with a 10 second delay. Swapping the relay should be a piece of cake. With the delay relay it will keep the fan from running every time I hit the brakes to slow for a corner or traffic.
No doubt the best option will be to graft in a pressure-temperature switch in the liquid line from the condenser. Obviously that requires opening the system. My dual relay jury rig should achieve my goal of running the fan while at a light, but not while motoring down the road. I am sure my alternator will appreciate the lightened load.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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