Well . . . I took my SSB SRT6 roadster up to J S Benz in Miami so they could track down the gremlins and root them out.

Seems that the wires connecting the OAT (outside ambient temperature) sensor to the instrument cluster had a break somewhere. Also I did find out that if the OAT system is not working (reading -36 F) it WILL disable the air conditioning as well as affecting other systems in the car. That OAT system is not just to let the driver know the outside temperature. It communicates with the ECM computer and affects fuel mixture and other things!

Also the wiring harness connecting fuse #15 to the heater control valves had a break somewhere.

They ran new (nicely and carefully hidden) wires to both systems and everything is now working as it should and looks factory fresh. NICE WORK!

Only problem is that my wallet much lighter!