You need approximately 30 psi. Pushing the valve is not much of a test. If
you can't identify the high/low pressure switches and you don't know how to
use gauges you may want to get some training. R134-A is a refrigerant that
does not take well to being topped off. Some of the chemical leak at faster
rates than others and topping off gives a mix that does not work
efficiently. In general if you need 10% or more the system needs to be
evacuated (and the bad stuff recovered) and filled with new.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Keith Ovregaard
Sent: Wednesday, January 27, 2010 9:59 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: AC relay question

Good question, BenT

There seems to be enough pressure in the system. I gave the test port
valve on the low side a tap and it gave me a short hiss. Didn't bother
to put a gauge on it because it didn't seem like a pressure sensor
issue at that point. The system was topped off in Sept., I think.
Maybe I should look into testing the pressure switches just the same.
Anyone know how to do a bypass test?

Keith O

On Jan 27, 2010, at 6:45 PM, BenT Syncro wrote:
>
>
> Do you have enough refrigerant in there? IIRC, compressor will not
> engage if you are running low.
>
>
> BenT
>>