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Re: Vaccum Air Conditioning System
Posted by David Prantl (more from David Prantl) on Mon, 29 Apr 2002 00:39:35
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

Puling a proper vacuum before refrigerant charging is very important.

You need an appropriate vacuum pump to do it right.  Like this:

http://www.acsource.com/cgi-bin/SoftCart.exe/scstore/p-93356.html?L+scstore+hfwk9254+1019855144

---
>  You can purchase vacuum pumps for this purpose - the less  expensive ones 
>use 'shop air' rather than electric vacuum  pumps.

These are virtually useless.  I've tried.  The only way to go is the 
electric 2-stage pump.  The cheaper ones differ from the expensive ones 
primarily in the CFM rating.  This indicates how long it takes to pull the 
required vacuum.  I got a good deal a couple of years ago (under $300) on a 
4 CFM Robinair unit.  I have also heard from people who have rented 
equivalent units from equipment rental places.

>  Trouble is, you need a license now to service automobile
>  cooling systems, so it's doubtful you can rent the tool.

Last I checked, you must have a license and must own refrigerant handlig 
equipment with an up-to-date performance certification ONLY IF you perform 
a/c service work FOR CONSIDERATION.  This means having other people paying 
you actual money for the work.

The only restriction on working on your own a/c system at home is that 
refrigerant can not be vented to the atmosphere.  If it all gradually leaked 
out by itself, you're legally OK.

>  Having a shop evacuate (and fill) the system might less  expensive than 
>buying a pump

Ahh, such a high level of honesty and character is a rare thing indeed in 
today's automotive service industry.  As I wrote before, if you show up at 
an a/c service shop in a clean SAAB 9000 CSE, you should expect a 4-figure 
service estimate.

If anyone has a more positive experience, posting the details to this list 
(shop name, address, services performed and prices) would be extremely 
valuable.

Best regards,

David Prantl
david_prantlno39sdcx6spamx782hotmail.com
'84 900S, 5M, 210kMi, RIP as of 2/98
'89 900, 3A, 116kMi, restored and SOLD on 3/24/01
'86 9000T, 5M, 198kMi
'88 9000S, 5M, 142kMi
'90 9000S, 4A, 140kMi
'93 9000CSET, 5M, 74kMi  -- FOR SALE in the TSN Classifieds --
'97 9000CSET, 5M, 60kMi
'68 97 Sonett V4, 4M, 76kMi, #000467
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