It's an 85 with auto transmission.  It has a new (4 year old) radiator
and I think it's fully bled, no coolant leaks.   When the AC cuts out
the water temp (as indicated by the gauge which seems accurate) is
hot, but not super hot.   The AC cutout has happened when the turbo
high-speed radiator fan is running, but also when it's merely running
at medium speed.

So there's an over-temperature cutout, but there is no over-pressure
cutout?  I have a vague memory of someone saying there was an over-
pressure cutout on the AC system...?

On May 3, 2008, at 8:19 PM, Mark Drillock wrote:
> What year and model is your Vanagon?
>
> Vanagons have an automatic shutoff for the AC compressor whenever the
> radiator gets too hot. It is meant to protect the engine from
> overheating.
>
> There is a single wire you could cut to prevent the hot radiator from
> triggering the shutoff but it is probably a bad idea. It is quite
> possible something is wrong in the cooling system to cause the high
> radiator temps. If the lower speed(s) of the radiator fan is not
> working
> for example.
>
> Mark
>
>
> Michael Diehr wrote:
>> After my R134 conversion, the AC works, but when temperatures get
>> really hot, something goes "click" and it stops cooling.   After a
>> few
>> minutes, it kicks back in and resumes cooling.
>>
>> It only happens in really hot weather, but of course that's when you
>> need the AC most.   Is this due to over pressure triggering a safety
>> cutout?
>>
>> Would conversion to Freeze-12 improve this situation?
>>
>>