I was having trouble with the AC compressor clutch not engaging on a 1995 XJS 2+2 V12, after troubleshooting the electrical circuity the component at fault was the AC coolant temperature switch. This switch is located on the passenger side coolant rail just ahead of the dash gauge coolant sensor. Looking through the Moss parts catalog i was not able to find the switch or a part number for the device. I attached the AC circuity from the electrical guide for reference. Does any one know a part # for this switch?.

 

The factory parts manual shows part # DBC12183, thermal switch. You'll also need sealing washer C22963.
The switch is normally closed, and is only there to shut off the A/C if the engine starts to overheat at 250F, 122C. If you regularly keep an eye on the temperature, you can just jump the two connections at the switch either temporarily or permanently.

Jon

 

Thank You Jon for the information, much appreciated

Anthony