My EF Fairmont climate control works perfectly most of the time.

Sometimes it seems to lose control of the temperature and run the fan flat out all of the time.

I've run through the diagnostic a few times and it always come up with no codes, but I don't detect the air being redirected during the process.

I can't get it into the monitor mode.

I can't find the heater tap.

I don't know where to look for the blend door motor.

Any suggestions?

Duck