If the back exp valve stuck I could see it causing the back unit to not
work, but I cant see it causing this problem. I think either I got
something plugging up with orifice tube in the front, or maybe something
is plugged up in the accumulator? Could a valve or something in the
compressor sticking open or closed cause this? As it said, it worked
just fine before I evacuated and recharged.
Brian Toscano wrote:
I'd think the orifice tube or expansion valve can stick open, closed, or
anywhere in between. It might pull vacuum depending on how it was stuck.
Regards,
Brian
-----Original Message-----
From: "Kaleb C. Striplin" <ka...@striplin.net>
Sender: mercedes-boun...@okiebenz.com
Date: Sun, 18 Jul 2010 10:36:27
To: mercedes Mailing List<mercedes@okiebenz.com>
Reply-To: Mercedes Discussion List <mercedes@okiebenz.com>
Subject: [MBZ] I buy a new AC machine, now have AC problems
I bought a new (to me) Robinair ac recovery recycle charging machine
yesterday. This one is a dual machine and will do both 134 and r12. It
came with about 20 lbs of r12. I am now going to sell my 2 snap on
machines.
So yesterday I am trying it out on my Suburban. The Suburban is not
cooling all the great. I pretty much completely rebuilt the ac last
year complete with new compressor, accumulator, orifice tube in the
front, expansion valve in the back. I hook the machine up and recover
the refrigerant, it recovers about 2.9 lbs. System holds 4.25. After I
recover, I pull a vacuum and it pulls fine down to 30" pretty quick. I
pull the vacuum for about 5 minutes and let it sit for about 15 or so to
see if it loses any vacuum. I then set the machine to charge in 4.25
lbs, which it does just fine. After charged I start the truck and turn
on the AC. I start hearing the belt squeel as the compressor is
turning, slowing down, then stopping till the clutch cuts out.
Strange. I watch the guages and as soon as the compressor kicks in,
high side shoots to well over 400, like 450 or more. Low side never
moves, it stays at around 60lbs which is about what it was showing after
charged before the system was started.
The strange thing is it worked just fine before I messed with it,
nothing was done that I can see would cause a problem. It acts like
something is plugged up somewhere. Do you think maybe when I pulled the
vacuum it sucked something loose and plugged up the orifice tube or
something? on the other hand, it seems that if something was plugged,
the high side would go real high, and the low side would go real low
maybe to a vacuum, but it just stays where its at.
I am fixing to head out and recover again and pull the system apart but
this is just strange, what could cause this problem?
--
Kaleb C. Striplin/Claremore, OK
95 E300, 94 S500, 92 500SEL, 92 300SD, 92 300E 4Matic,
91 350SDL, 91 300D, 89 560SEL, 87 300SDL x2, 85 380SE 5.0 Euro,
85 190D, 84 190D, 84 300D euro manny, 76 240D, 76 300D,
http://www.okiebenz.com
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