[V8] Climate Control blower out of control

[Gene]

I was just cruising down the road, when the CC blower started running at 
max speed.  No buttons had been pushed to initiate this.  Other climate 
control functions, like temperature and which ducts, seem to work OK.  
But I am unable to control the blower other than by pulling the fuse.

I tried swapping in a known good CC control head, with no change in 
behavior.

I'm wondering if there is a stuck relay somewhere?  I looked at two 
relay/fuse panels in the passenger footwell, but did not see any relay 
related to the blower motor.  I don't know if there are any other relay 
clusters and I can't find my manual right now. 

Gene Caldwell 
90 V8
91 200q20v
94 90S
01 540i