Date:         Fri, 2 Jul 2004 10:13:59 -0700
Reply-To:     Michael Diehr <md03@XOCHI.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Michael Diehr <md03@XOCHI.COM>
Subject:      cold-engine stall with A/C on
In-Reply-To:  <20040702163901.3E36C5B911@gollum.dreamhost.com>
Content-Type: text/plain; charset="us-ascii" ; format="flowed"

>Date:    Fri, 2 Jul 2004 08:32:23 -0400
>From:    Michael Rule <mikerule@UFL.EDU>
>Subject: cold-engine stall with A/C on
>
>Hi All,
>
>I've an 84 Westy 1.9L H20-box... idles/runs fine without A/C.
>
>When the vehicle is first started (engine cold) and A/C turned on,
>the rpm's will drop, but not enough to stall.  However, as soon as
>I started driving, the vehicle will stall in-between shifts or
>when coming to stop-- until the engine warms up (10-15min)... any
>thoughts on where to start trouble-shooting and how to adjust?
>
>Thanks,
>Mike

Mike,

I posted my first attempt at an idle-problem diagnosis flowchart for
the 1.9L a week or so ago.   Search the archives for "Cold Idle
Diagnosis (1.9L)" posted 6/22/04.

The 1.9 has three valves that let more air in.  The "Auxiliary Air
Valve" is hard to see (mounted on the block under the intake), the
other two (Power Steering and Air Conditioner) are against the
firewall (right side).   White colored, with obvious vacuum hoses
entering and leaving.

If it idles well except for when the AC is on, I would guess that the
AC aux air valve is bad.  However,  you mentioned that it gets better
upon engine warm up, which suggests that both the AC valve and the
Aux Air valve might be bad (or both of them might be marginal).

As far as I know, the Aux Air valve is adjustable, but the AC valve is not.
I'd recommend visual inspection of all vacuum hoses and test the
electrical connection to the AC valve.

YMMV : i have an 85 w/ automatic tranny, so my engine may be somewhat
different.