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Date:         Tue, 5 Sep 2000 09:08:18 EDT
Reply-To:     RallyXer@AOL.COM
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Heath Vogt <RallyXer@AOL.COM>
Subject:      Re: 89 syncro westy ac fixed (correctly this time)
Content-Type: text/plain; charset=ISO-8859-1

Wow, I knew the Volkswagen Engineers were great, but they actually modified the laws of physics so that a VW A/C unit works differently than all other cars. Impressive.

Don't be fooled by a temp reading of 42. First I wouldn't trust a bulb thermometer or even a cheap digital to more than 10 degrees and the volume of air at 42 degrees is also very important. Sorry if I'm sounding skeptical, but I just went through this with my Toyota dealer on a waranty job. They took my truck into their air condidtioned service bay, ran the a/c on recuirculate, and got a temp reading of 45, they claimed nothing was wrong with it. After pissing and moaning, explaining to them the principles of heat transfer (boy, the crappy explainations they'll try to pawn off on a person are rediculous, not to mention against the laws of physics), and telling them I wanted to measure a new truck side by side with my own, they found a bad blower motor and a leaking compressor fitting.

Hope your problem stays fixed.

Heath

In a message dated Mon, 4 Sep 2000 8:45:31 PM Eastern Daylight Time, Mick Kalber <hotlava@INTERPAC.NET> writes:

<< Anyway, it finally got fixed right. Seems, according to my tech, that vw ac units are charged a bit differently than other cars. My guy said usually the refrigerant is added to the high side and then run awhile and the high and low sides adjust to the right levels... but in vw's something else has to happen to the low side after the refrigerant is added to the high. I don't know what he was talking about, but perhaps John or David here can elucidate us further. Maybe this is just a shop out in the middle of the Pacific Ocean that didn't know about the difference between VW ac and other cars, but it might be nice if the list members know what needs to happen so they can see if the shop they use knows what the h*ll they're doing.

Anyway, the ac is REALLY cold now... they measured it at 42 degrees which sounded awfully low to me, but who's to complain? Gets plenty hot here... we can use it.

BTW, thanks to everybody who helped me out on this problem. List is great!

Mick Kalber 89 Syncro Westy "Daddy-O" Tropical Visions Video, Inc. 62 Halaulani Place Hilo, Hawaii 96720 ph. 808-935-5557 fax 808-935-0066 hotlava@interpac.net www.volcanoscapes.com

-----Original Message----- From: John [mailto:johnpatt@warwick.net] Sent: Tuesday, August 15, 2000 9:22 PM To: Mick Kalber Cc: vanagon@GERRY.VANAGON.COM Subject: R12 Overharging is NOT a solution!

Hi Mick,

Something just occurred to me about your situation. If the evaporator was restricted (not blocked or perforated)like a crimp in the evaporator "tailpipe" or outlet, the following might occur:

1) The high side would NEVER be high because the compressor could not get the necessary R12 vapor quantity due to the blockage.

2) The low side would NEVER be low because the vacuum of the compressor could never act fully on the refrigerant vapor due to the blockage.

3) "Massive" amounts of refrigerant may be needed to counter the evaporator blockage and get any cool down performance.

Think about this Mick and talk with your technician (if you haven't choked him yet). I may have just thought myself out of a trip to Hawaii....................

Regards, John >>


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