Date: Fri, 1 Jul 2005 19:24:57 -0700
Reply-To: Tom Bauer <Tom.Bauer@SUN.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Tom Bauer <Tom.Bauer@SUN.COM>
Subject: Re: R134 conversion
In-Reply-To: <vanagon%2005070115581816@GERRY.VANAGON.COM>
Content-Type: text/plain; format=flowed; charset=ISO-8859-1
One more hint as to this problem is the guy that did the repair said
that the "manifold pressure" used in R134 is a lot higher than with R12.
This sort of sounds like he is using the same compressor for either R134
or R12 and R134 is tougher on compressors. Does this sound reasonable?
Thanks,
-Tom
Roger Sisler wrote:
>Hello, the difference between a new compressor and a rebuilt compressor is
>as follows: The new compressor has everything new. A date of manufacture
>is stamped into the front mounting ears, but this is not really the date of
>compressor manufacture. Only the date that that part was made.This date
>will have as the second didget, the last mumber of that decade.If made in
>1984, this didget will be a 4.The first didget will be a 1 through 9 for
>the month, if made between jan and sept. It will be a X,Y,or Z if oct, nov,
>or dec.Cant tell much by this date. The rebuilt compressor has a new
>clutch/pulley, a new rear valve plate, a new shaft seal, a new paint job,
>new oil. The internals are not touched. These include the pistons,
>cylinders, thrust bearings, and more.I guess this is ok , unless you get a
>remanufactured compressor that came out of a pre 86 vanagon. These vanagons
>have no low pressure cut off switch in the a/c system. The oil will leave
>the compressor as the refrigerant level goes down. No switch to protect the
>compresor on these vanagons. All other vehicles have this switch.VW covered
>their a@@ on these vehicles by putting a sentence in the owners manuel to
>have the a/c system checked out before each cooling season.Hopefully a low
>freon situation would be caught ,and the compressor protected.I think about
>90 percent of pre 86 vanagon found themselves in a no freon situation real
>quick,and not recharged.. I dont think the compressor in my 85 was working
>for about 15 years.I removed and dissembeled my compressor to try to find
>out why it was thumping so badly.When the clutch face plate was turned by
>hand, there was a "ruff" spot for about 30 degrees of each rotation. Turned
>out to be a thrust bearing. I emptyed the oil and measured 1/2 ounce, where
>there once was 8 ounces.This is what happens without a low pressure cut off
>switch.Being out of freon for 15 years also roached the shaft seal for
>sure.I think you can get a compressor anywhere for less than the price you
>got. they go for about $300 w/ shipping at Bus Depot. A bit more at other
>vendors.
>
>
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