Herb,

I just did the same conversion to R-134a on my '91 gl and have very good
results.  I'm getting about 32-39 degree differential from outside air
on fan speed three, and full cold on the dial with a bottom out temp of
about 40F.  It's colder than my acura!

I'd check the low-side pressure.  You should be about 40-45 psi at 85-90
degrees outside.

wade

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@GERRY.VANAGON.COM] On Behalf
Of Herb Harmison
Sent: Sunday, August 11, 2002 12:14 AM
To: vanagon@GERRY.VANAGON.COM
Subject: A/C Performance in '91 GL

My '91 GL's A/C is not doing a great job since converting from R-12.
Because there is little information in Bentley, perhaps some of the
great people on the list can add a bit of data.

I have a thermometer in the ducting just in front of the driver to
monitor the output air temperature. When running with all the outside
vents closed, the A/C full cold and fan speed at 3, I can get about a
25F drop from the outside air. This means that at 85F outside I am
getting 60F air in my face. I would like to have another 10F to be
completely comfortable.

It seems the R-12 did a better job but, lacking data, I can not be
certain.

BTW, what is ES-12? Has anyone used R-406a in a GL?

Thanks,

Herb Harmison
2692 Meadow Glen Road
Ames, IA 50014
515-292-7059 Phone/Fax
herbh@iastate.edu