Trying to troubleshoot AC in my '90 Westy.  I understand that the AC
cuts our when the system heats to the point that the radiator fan would
normally come on.  How do I check to see if that part of the circuit has
'turned back on', that is, how do I check to make sure the AC control
system doesn't think that the fan is running?  What relay?

I realize that a couple of hours with Bentley could probably answer
this, and another hour finding the possibly offending rely, but if
someone can steer me directly to the point or points to check it would
be appreciated.