Newsgroups: rec.autos
Path: cantaloupe.srv.cs.cmu.edu!crabapple.srv.cs.cmu.edu!bb3.andrew.cmu.edu!news.sei.cmu.edu!cis.ohio-state.edu!zaphod.mps.ohio-state.edu!uwm.edu!caen!batcomputer!cornell!rochester!rit!isc-newsserver!ritvax.isc.rit.edu!AJG1678
From: ajg1678@ritvax.isc.rit.edu
Subject: Re: Buick heater controls
Message-ID: <1993Apr20.003313.16695@ultb.isc.rit.edu>
Sender: news@ultb.isc.rit.edu (USENET News System)
Nntp-Posting-Host: vaxa.isc.rit.edu
Reply-To: ajg1678@ritvax.isc.rit.edu
Organization: Rochester Institute of Technology
References: <9849@dirac.physics.purdue.edu>
Distribution: usa
Date: Tue, 20 Apr 1993 00:33:13 GMT
Lines: 1

I had the exactly same problem with my '70 Lesabre. It was also from Cal.     What I did was go to the local junkyard and pick up a diaphragm from a '68      Lesabre with the same heater set up.  It worked for me, but a little bit slow   to change from vents to defogger.  Better than nothing!
