<VV> Vacuum Pump - A/C System

[WillSmithTFPOCAllenTexas]

My 2 cents worth about Msg 10:
Harry is ABSOLUTELY right. The reason you MUST remove the AIR & MOISTURE is 2-fold...1] any air in the system also contains moisture which will rust the internal parts...2] air in the system takes up space so you have less refrigerant in the system which means it won't cool as well [the refrigerant is what transports the heat from the air entering the car to the condenser on the outside of the car]...air in the system also raises the high side [head] pressure to an unacceptable level as the moisture turns to steam. By dropping the pressure inside the system [pulling a vacuum simultaneously on both the high side and the low side] the moisture is able to vaporize and be extracted by the vacuum pump which only pumps a gas [vapor], not a liquid...the longer you can run the pump [overnight if possible] the better...then the challenge is to get the new refrigerant into the system without allowing any air to also enter...the WORST THING to allow during charging is air entry because of the problems it causes. If you don't know how to do all this I suggest you find a Pro to help you...it will be less expensive than repairing the internal damage that can be caused by improper service technique. [Ever wonder why there are so many compressor failures on cars in a SEALED system that uses highly refined lube? Ever wonder why there are fewer compressor failures on home refrigerators and a/c units, both window and central?]

Will Smith
"The Fresh Prince of Corvair"
WANTED: 66 Monza vert, 110, pg, white top, no rust, great condition, driver for Parade Duty and taking kids for a ride in something they've never seen plus playing "Find the Motor".

Message: 10
Date: Wed, 9 Aug 2006 08:29:03 -0400
From: "Duane, Jim \(US SSA\)" <Jim.Duane at it.BAESystems.com>
Subject: RE: <VV> A/C Compressor ...Quasi Vair
To: "Harry  Yarnell" <hyarnell1 at earthlink.net>, <JVHRoberts at aol.com>,
<rusecular at yahoo.com>, <virtualvairs at corvair.org>

Hi Harry.

Ah, got it.  Thanks for the info.  I'll have to look around to see if I
can borrow a vac from someone.  

-----Original Message-----
From: Harry Yarnell [mailto:hyarnell1 at earthlink.net] 
Sent: Wednesday, August 09, 2006 8:25 AM
To: Duane, Jim (US SSA); JVHRoberts at aol.com; rusecular at yahoo.com;
virtualvairs at corvair.org
Subject: Re: <VV> A/C Compressor ...Quasi Vair

Absolutely! The system must be sucked down for at least 1/2 hour. This 
removes the air and moisture; the system must have 100% refrigerant, no
air, or it won't work.

Harry Yarnell
Perryman Garage and Orphanage
hyarnell1 at earthlink.net
----- Original Message ----- 
From: "Duane, Jim (US SSA)" <Jim.Duane at it.BAESystems.com>
To: <JVHRoberts at aol.com>; <rusecular at yahoo.com>;
<virtualvairs at corvair.org>
Sent: Wednesday, August 09, 2006 8:15 AM
Subject: RE: <VV> A/C Compressor ...Quasi Vair

OK, I have a "quasi Vair" question...  Some of the A/C repair experts
(at least the self proclaimed ones on the web) say that when your A/C
system is opened up, before a recharge you must use a vacuum pump.  Do
we?  And if we don't, what bad things will happen?

Jim Duane
'66 180 CVT
CORSA
Colonial Corvair Club

-----Original Message-----
From: virtualvairs-bounces at corvair.org
Sent: Wednesday, August 09, 2006 6:29 AM
To: rusecular at yahoo.com; virtualvairs at corvair.org
Subject: Re: <VV> A/C Compressor ...

Be careful here, the Corvair compressor is special in that the rear head
is different. It has a reverse rotation oil pump. Spin the thing the wrong
way, and  it'll pump refrigerant fine. For a while. The main difference
between a Corvair A6 and an A6 for the rest of GM is the rear head.

In a message dated 8/8/2006 9:41:53 P.M. Eastern Standard Time,
rusecular at yahoo.com writes:

Thank you Mark ! My concern is that the seller originally told me that
the A/C  compressor was for an early 70's Cadillac. He mentioned "A6" - and claimed that it'll also fit the Corvair.

I want to put this unit on my  brother's car (66 Corsa) which has been
missing the compressor for a while. I  personally prefer the newer
Sanden (SD-5 ...I can have the bracket made), but he's bent on keeping things stock.

Thanks  again,
Tony