The 86+ vans with factory A/C have 3 speed rad fans. Low and high are
connected to the rad temp switches. Low is also run by the A/C on
switch. Medium is run only by a high pressure switch in the A/C lines.

Medium is pretty loud, run only by A/C high pressure switch.
High is real loud, run only by the rad high temp switch.

Mark

David Bjorkman wrote:
> Hi Volks;
> All of a sudden, my radiator fan only works on high.  I was driving
> slowly in traffic, with the A/C on .  My lovely wife looks over and says
> "Gee, I've never seen the temp guage that high".  Holy smokes, I look
> down and the needle is at least a full needle width above the LED
> (Inline 4 FAS motor-cast iron -:)).  Even in Mesa, AZ this past June at
> 110+ F with the A/C on I have never seen it that high.  I wasn't even
> sure the gage itself would go that high.  Well, just at that point the
> high fan kicked in.  As I thought about it, I had only heard the fan
> kick in (I usually kinda note those things as past esperience is a harsh
> teacher) on high at all that afternoon.  I have heard that A/C has some
> sort of a high fan kickin, althouht I am not sure how to tell the thermo
> switch high fan from the A/C high fan, if there is one, so I am not sure
> if the thermo switch was working at all, but the fan sure was.  I
> took the bus onto a street where I could travel at 30-40 MPH and it
> cooled right down to just below mid LED, where it usually runs.
> Anyway, unless someone thinks otherwise and can enlighten me, I am
> assuming it is the radiator thermo switch.  Haven't looked yet, but can
> I trust a FLAPS switch (if avaliable, to save me a wait for the mail),
> or should I go right to one of our friendlu, helpful vendors?
> Dave B.
> '87 Westy w/FASTT inline 4
> '84 Westy WBX