One note: I failed to say was, do the initial charge through the hi-side, compressor not running, then after start-up charge through the suction side for final charge, sorry after being in the AC-Refrigeration business for nearly 40 yrs, I assumed you would know. Dave.
-------------- Original message --------------
From: sosmi@xxxxxxxxxxx
The important thing about evacuating the (any) refrigeration system is, that the vacuum pump can pull down to 28-30" of vacuum. Then the system should be able to hold that vacuum for at least 15-20 minutes, valves closed, pump off. If it can't, then a leak in some component, or gauge set etc. is possible.Before charging, be sure to purge the charging hose with refrigerant, that will insure no air or moisture are introduced in the system.It's best to charge through the HI-SIDE, or compressor discharge side, this prevents SLUGGING the compressor at start-up. Evacuating the system will not remove the lubrication oil, so careful measurement of oil in the compressor is important.An over-charge of oil will reduce the cooling capacity of the system, and possibly slugg the compressor.If you have had catastrophic compressor failure, or a system that has been down for years, then a flush to remove the contaminants, and old oil is in order.The condenser, and evaporator always
retain some oil.Along with that, a new filter drier, and possibly an expansion valve replacement as well.Ya'll have a nice day, Dave.
-------------- Original message --------------
From: Ken Lang <imperialken@xxxxxxxxx>
> I'll answer just about the vacuum pump. I've been using (for years) an old
> pump from a discarded freezer. It will pull down a little more than 28
> inches of vacuum. It's a little slow but it will pull the system down every
> time.
>
> Ken
> 67 Crown 4 Dr Ht
> 68 LeBaron 4 Dr Ht
>
>
>
> -----Original Message-----
> From: mailing-list-owner@xxxxxxxxxxxxxxxx
> [mailto:mailing-list-owner@xxxxxxxxxxxxxxxx] On Behalf Of aeyn
> Sent: Friday, June 29, 2007 8:06 AM
> To: mailing-list@xxxxxxxxxxxxxxxx
> Subject: IML: A/C ReVamp - RePlacing Parts?
>
> I know that this a topic which MANY of us avoid, partially
> because of ignorance and partially because of expense (
especially
> with R-12 systems). However, if some of ue can do MINOR fixes on
> our own cars to get the A/C's up and working, it would be great!
> AND we can show off our cars more!
> Obivously, there are those of us who are mechanically
> Professional and those of us who are not, some in between. We
> all have our forte's and our weaknesses. I love to work on the
> electrical, but I can replace seals (and failed parts) and follow
> instructions very well. And sometimes EVEN repair parts TOO. I
> am very weak in the A/C area and would like to know a couple of
> things about it from those in the know.
> I can be a bit of a perfectionist, and like to do something
> ONCE the RIGHT way, because I do NOT want to have to go back and
> re-do it to repair failed parts nor stupid mistakes. NOW, I want
> to replace ALL of the seals in the A/C systems of our 93 and 75
> Imperials and our
9 2 Grand Voyager (could be a bit of a pain as
> it has DUAL A/C) with the newer GREEN o-rings. Are they longer
> lasting and compatible with ALL refridgerants? I want to have
> the remaining R-12 suctioned out and "washed out". Does any one
> know if Harbour Freight sells an inexpensive Vacuum pump that
> will do the job? ( AND what should I look for in one?) And after
> having opened the system to replace the O-RING seals ( with oiled
> green ones), are there ANY components which SHOULD BE or MUST BE
> replaced for longivity without lose of refridgerant and failed
> OLDER parts?
> I am on this at this time as is has been over 100 for
> sometime now here in Tucson and I am experiencing over heat in
> the 93 caused by a less than proper charge in the A/C system.
> Also I want to get the A/C on the 75 working, it came with a
> spare plenum and other A/c parts.
> I am looking to c
ha rge the systems with FREEZE 12, but I am
> not sure how much oil to put into each system. I was very glad
> to here that we have members using FREEZE 12 and have not have
> any problems with it. ALSO, how much ORIGINAL R-12 went into
> each system?
>
> I do hope that the answers to this will help many others here in
> the US and in other countries.
>
> Æyn & Patrick
>
>
>
> ____________________________________________________________________________
> ________
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>
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