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Date:         Thu, 16 Apr 1998 16:47:11 EDT
Reply-To:     GMBulley <GMBulley@AOL.COM>
Sender:       Vanagon Mailing List <Vanagon@vanagon.com>
From:         GMBulley <GMBulley@AOL.COM>
Subject:      Re: a/c  cutout switch
Comments: To: dboehler@TAOS.MIDWEST.NET, Vanagon@VANAGON.COM
Content-type: text/plain; charset=US-ASCII

In a message dated 98-04-16 16:00:17 EDT, dboehler@TAOS.MIDWEST.NET writes:

<< Please help.... >>

We'll do our best.

<< There is no system blockage.>>

How can you be sure? Have you tested all of the componants? A blocked filter/drier causes this. Happened twice to me.

<<Does this unit have a high side cutout switch???>>

Yes. I don't have an '86 or a manual for one, but every other VW with a/c I've owned essentially had Two. One was a SINGLE USE, emergency high pressure release valve. Some cars have it near or on the receiver/filter unit. My current Jetta has it on the inlet line to the condensor. It is a small plug with an alloy insert. The alloy melts at a very specific temperature: a temp attainable only at very high pressure.

The other, the one you are probably looking for, is part of the circuit (typically) to the clutch switch on the compressor. If the temp exceeds 120 degrees Celcius, acheivable only at excessesive pressure, the switch denies ground to the compressor clutch.

<<If so where should it be located??? My unit has none. >>

Check again. For the releif valve, look up front, by the condensor. Follow the HIGH pressure hose out of the compressor, and all the way up to the front to the condensor. For the switch, look up front also, near the top of the condensor. (These are guesses, and hopefully a 1986 owner will set you straight)

The bentley book shows a pipe with a high pressure and a low pressure cutout switches. I think I may have discovered why I had some hoses weeping. >>

Depending on which hoses you are talking about, and when they are "weeping", this would be completely normal. Condensation in the summer collects on the cool tubing leading to the evaporator. This is probably unrelated, and not indicative of any pressure problem in your system.

gmbulley cary, nc


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