On my 90 Golf the speed "4" suddenly does not work. It works on all the other speeds (1-3) just not 4. Did some digging, is this mostly likely the switch in the dash, the relay or the fan motor?
Last day or so its been really hot and I went to to turn on the AC and noticed that no cold air was coming out nor could I hear the compressor running. Usually the engine dips a bit when its on.
Well I went to my Bentley manual (page 254) and started looking at the wiring diagrams. It appears that on "4" the circuit runs from the switch through the AC relay and than down to the fan. It does not go directly through the fan. The AC is not working either.
So that would mean the AC relay is bad? I checked the fuse above the relay panel and it was fine. I pulled the relay out and a coworker who is an engineer tested it and said it appears good.
So now what? Is it possibly the control head in the dash? I saw some people mentioning that if the freon is low the compressor will not run. Since my "4" does not work and the AC does not work I would think its probably something both have in common like the AC relay. If the AC pressure was low would that preclude the "4" from working?
I am not getting this. I dont think its the resistor on the blower motor because the AC is not working either.
Thanks.