Yes, all of the factory AC vans from at least 84 on have a relay that
disables the AC compressor clutch whenever the radiator temps are too
high and the radiator triggers the highest speed fan. The 86+ uses a
much more powerful fan motor and has 3 speeds to accommodate the heat
load of the AC.

You might consider upgrading to the larger fan motor. I did this a few
years ago for someone. It requires the fan/motor assembly and fan shroud
as a unit. Then there is some wiring to be done since the less powerful
version needs less current.  The models that have the big fan also have
a larger relay for high speed and this relay has it's own power lead
right from the battery. Yep, it blows a ton of air and may startle you
whenever high speed kicks in and you start looking for the helicopter
than must be landing nearby. The best thing is to get all the needed
stuff from a junkyard donor 86+.

Mark

Keith Ovregaard wrote:

> Keith
> Looks like the Keith's are in agreement here. Although I am not
> certain of a high pressure AC switch on my 84. No doubt the relays are
> set to give priority to the high speed fan at the expense of the AC
> compressor. Meant to be that way, it seems. I don't think anything
> abnormal is happening with the radiator: no discolored fluid, no
> leaks, apparently good circulation, resent/frequent coolant change (VW
> approved) and normal operation for 10 years. Just looks to me like the
> old 84 has trouble running the AC at temps in the triple digits. Or am
> I still missing something?