It's Fixed ! (sort of)

I signed up for the online manual and investigated the diagnostic modes of the control unit. Blower control voltages were fine and varied with the fan speed setting.

I drove and watched the system vars and everything seemed OK.

I dug out a meter and started checking the fuse voltages with the key in pos 2 - engine not started.

About 2 seconds after the last good measurement of the 4 A/C circuits, the blower started and has not stopped yet. I do not think that it was a loose fuse as I've had them out twice and the fit and connection is good.

I think that it just knew that I was not going to give up and that I was ready to rip the motor and power control module out.

As a relentless troubleshooter, I've seen this happen with other systems too.

I now have an education on the A/C and control systems.

Thanks for the hep !

Barry