Hi in my case I have found that on very hot days and after 20-25 minutes of
operating on high speed, 4 on the knob, the wire in the D pillar before the
fuse that feeds juice to the fan gets hot and trips the fuse.  A while back
the original fuse got so hot that it basically melted the plastic holder so
I replaced it with a resettable fuse. The interesting thing is that the
wires after the fuse going to the fan do not get very hot.  I think my
problem has to do with fans getting older and drawing more amps than normal
in high speed.  Any suggestions??  Should I replace the wire that gets hot
with next gauge wire??  All other speeds, 3,2,1 work just fine. 

_________________
Jaime Forero
jforero@sbcglobal.net
Siempre Adelante!!!
������ �����!

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Kim Brennan
Sent: Wednesday, August 10, 2011 10:17 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: AC cutting out momentarily

Fan cutting out? That's not a freon issue. That's more indicative of a
electrical issue. 3 possibilities occur to me. Thermostat switch (that which
turns on the AC and sets the temperature. Speed control switch. That's the
one with the 1-2-3-4 numbers on it. Wiring harness issue in the D pillar.

If you have had condensation from the evaporator falling inside the cabin,
then it is possible the condensation has made it into the wiring harness in
the D pillar. This can lead to corrosion of the wiring, leading to
resistance, leading to melting of connectors, etc.

But an intermittent issue is most likely the first scenario. The thermostat
switch is a rheostat (variable ohm resistor), which over time can age, and
become loose. If it is loose enough it won't maintain the proper
connections, and that could "turn off" the AC.

On Aug 10, 2011, at 9:47 PM, Michael Hart wrote:

> AC stops for a second or two. Just one time at first, now a few times in a
row.
> Blower fan stops then comes back on.
> I rebuilt all hoses 2 years ago (kept to R12, new dryer, etc); system has
blown cold ever since.
> Is this a sign of low freon pressure or more likely a fan electrical
fault? How to Diagnose? Late rear Westy factory AC system (87).
> Thanks
> Mike
> 87 2WD Westy