If your van is Digijet ('85 and older), the idle is raised during A/C
operation by an air valve that is acuated when the compressor is on.  The
valve is located on the passenger-side firewall in the engine compartment.

On Digifant ('86 & newer), the idle is raised during A/C operation by the
ISV and the Idle Control Unit.

Cheers,

Jeff

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com]On Behalf
Of Ki
Sent: Sunday, November 02, 2003 12:09 AM
To: vanagon@GERRY.VANAGON.COM
Subject: a/c causing rpms to drop when turned on.

is this normal?  in the summer usually have to turn the idle up so i can
run the a/c.  is there a fix for this problem?