That year/model should be ok under those conditions so my guess is you
have issues with the radiator fan system or the radiator itself.
Possibly multiple factors could be involved and need repair if you want
the A/C. The power loss is expected of course.

Mark

Arlene K Sondergaard wrote:
> I had my A/C recharged on my 87 Wolfsburg automatic and found a loss of
> power resulted when using it.
> I couldnt drive the Gifford Pinchot forest roads using it because of
> overheating also.
>
> Cut the belt off.
> Power fine, no overheating, on forest service rds.
> We still use the system--the fan runs the length of the roof-good
> circulation.
> Much better than nothing.
>
> Arlene
> 1987 Wolfsburg Carat
> Washougal Wa
>
>