Ok, I've searched the archives but there's nothing definitive on my question, so I'm asking:

my fan speed control switch only works on full/defrost. Does this mean the relay (XXI) is bad? Will swapping the defrost relay (XXII) work as a test? I want to drive the car until the snow flies, and for that I'll need heat that isn't full blast all the time...

Emanuel

 

Sounds like it may be the resistor block. I haven't done one on the 928 yet, but I think the procedure is at Nichols site.