Thanks for the info.
I have tried to test the ballast resister. When testing for continuity
with a ohm meter I got no current flow across it.  The only problem is I
don't know the proper way and what to look for when testing the
resister.

Kenneth Winter
87 Vanagon

Derato@aol.com wrote:
> 
> my 87 westy has suffered the same A/C symptoms of popping the releif valve on
> the reciever drier.  i believe the source of the problem lies in a burnt out
> circuit in the ballast resistor behind the driver side headlight.  When i
> resoldered the obvious break in the ballast resistor,,,i now had a lower fan
> speed to cool the engine.  i believe this lower fan setting goes on when the
> ac goes on...and without it.,.the system overheats and pops the relief valve
> on the receiver /dryer.  in addition...the lower fanfan speed is a first
> degree of engine cooling,,,so the second fan speed(hhowling) dosnt ever have
> to kick in.