My sister informed me that the A/C in her car was only working intermittently for the past two months until it finally stopped working all together one week ago. She had the local garage look at it and he said she needed a new compressor connector with attached harness. She went to the dealership and was able to order this item. This to me was a big suprize as having been a tech for many years with Mitsu we were only able to get complete harnesses. Anyhow, the part is on order for $24 and her local mechanic said he would only charge $25 for replacement.
After she explaind to me this story I told her I wanted to look at the suspect connector/harness. Doing so I could find nothing physically wrong with it. Testing it with the vehicle running and A/C on showed a constant 12v on the Lw wire and alternating ground on the R depending on the switches ON/OFF position. This to me seems proper for a negative switched circuit. I also manually grounded the R wire while the compressor was being supplied 12v and noticed no compressor clutch engagement. To me this shouts out clutch failure. As I'm not familiar with Ford I'm hoping to solicit some backup here from those that have hands on experience with Ford electronics.
Any insight would be greatly appreciated. ;-)
Cheers, Tj