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Date:         Thu, 20 Jul 2006 13:54:06 -0400
Reply-To:     dhaynes@OPTONLINE.NET
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Dennis Haynes <dhaynes@OPTONLINE.NET>
Subject:      Re: Newly operational AC just died...
Comments: To: John Bange <jbange@GMAIL.COM>
In-Reply-To:  <6da579340607200955v5745ac64pe1b2697daa62d202@mail.gmail.com>
Content-type: text/plain; charset=us-ascii

That latter switch is often known as a "Trinary" switch. It combines low and high pressure safety and high speed fan operation.

Dennis

----- Original Message ----- From: John Bange <jbange@GMAIL.COM> Date: Thursday, July 20, 2006 12:55 pm Subject: Re: Newly operational AC just died...

> > There is probably a low pressure cut off switch that saves the > > compressor from burning up when the 134a gets low. In post 86 > vanagons,> this is up above the engine area. It has wires attached > to it. There is > > also a high pressure cut out switch. Dont know 2.1 vanagons(even > with a > > subie) too well. You can remove the electrical connector from > the low > > pressure cut off switch9see Bentley) > > > One little "gotcha" in the Bentley is that it shows separate high > and low > pressure switches, but on later models (at least on my '90) it's a > singlecombination switch with four wires coming out and going to a > flat four pin > connector. Whichever it is, to test if it's a low pressure sense > issue you > can disconnect the pressure switch(es) and jumper the Red-with- > White-stripe > and Red-with-Black-stripe wires with the AC turned on. If the > compressorclutch clicks in, it's a low pressure switch issue of > some sort. This could > mean actual low pressure or a bad switch, though. > > -- > John Bange > '90 Vanagon - "Geldsauger" >


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