Hi there,

This is not just a vanagon question but the problem is the same in both
vehicles, noticed mostly in my quantum syncro.  When I use the AC I get
mixed results.  If I turn it on and it works right away it will then
freeze up the evaporator in about 25 minutes and then will slowly
decline in quality until I just give up and shut it off.  The other
occurrence is that I get in the car and turn on the AC and nothing
happens, I keep driving, nothing happens.  Sometimes it will take up to
15 or 20 minutes and then suddenly it will start blowing cold air only
to then act as it does in first situation (freezing).

So, what should I do first?  My first instinct is the evaporator
thermostat (the switch with the capillary tube), could it be something
else?  I really need some help, some of these parts are very expensive
so I don't want to just try replacing things, which is basically the
suggestion I got from a local shop.

Thanks for your help
John