In a message dated 98-04-16 16:51:21 EDT, GMBulley@AOL.COM writes:

> Yes. I don't have an '86 or a manual for one, but every other VW with a/c
I've
>  owned essentially had Two. One was a SINGLE USE, emergency high pressure
>  release valve. Some cars have it near or on the receiver/filter unit. My
>  current Jetta has it on the inlet line to the condensor. It is a small plug
>  with an alloy insert. The alloy melts at a very specific temperature: a
temp
>  attainable only at very high pressure.

There are both high and low pressure switches located under the driver's side
A/C cover by the rear hatch.

Jim Davis