On my 84 there is a solenoid operated valve over on the right front side of
the engine compartment that raises the idle by letting more air in when the
ac is on. I would guess there is vacume leak in a hose in that area. If you
have power steering there's a second valve that operates when you crank the
steering wheel hard.

Joe

----- Original Message -----
From: "Daniel Johnston" <johnstond@mailserver.volvo.com>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Sunday, May 06, 2001 10:23 PM
Subject: quick idle with ac on

> My 87 runs great, yet when i put on the a/c it instantly goes up to
> 2,000 rpm. Switching off the a/c brings it back down to 1,000. Any
> suggestions for trouble shooting is problem would be greatly welcomed.
> dan
> 87 westie
>