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The voltage is on the wire coming from the harness. Most likely it dodges into the compressor and through the superheat switch after that point, but before getting to the clutch.
Tomorrow, I am going to get under the car, unbolt the compressor and have a really good look to see if there is a superheat switch on this car or not. If there is, I am going to install a long jumper wire that I can cut later to restore the superheat switch if the problem proves to be in the fan controller.
The other day, it was 105 deg F, and the A/C cut out. The fan was running when I stopped the car, but it MAY have been running due to coolant temperature. After the car sat for 20 minutes, the fan and A/C worked. They both worked for about 10 miles (usually in hot weather, the A/C is only good for about 3 miles) and were working when I shut off the car to go into a store for 5 minutes. When I came out, neither the fan not the A/C worked. I drove home, and jumpered the fan to run on high. After 6 minutes, (99 degrees out) no A/C. I got the garden hose and watered the condensor for 2 minutes, then waited 3 minutes. Still no A/C. Then I turned the hose on the compressor for 2 minutes. After 2 more minutes, the A/C came on, but no fan.
So, I am sure that the superheat switch is disengaging the compressor, but still not sure whether it is due to a defective switch or intermittent fan operation.
That's why I am going to install a removeable jumper wire. I will disconnect the battery for 30 minutes to clear the computer fault codes that may have been caused by my troubleshooting and then get it onto a VADIS machine to see if there is a problem with the fan.
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