RE: Re[2]: a/c compressor

["Rick Lackner" <hugacub@whidbey.net>]

> I gather that what I'd be looking for in this test would be to see if the 
> pressure sender, keeping the clutch from engaging to avoid the damage that 
> Shawn noted, could be overridden to get the clutch to "catch," right?

Yes, you only want to override the switch to see if the compressor 
engages, and to look in the sight glass to see if there are bubbles 
which means the freon is low.  After the compressor is engaged for a 
bit you can feel the hoses to get an idea of what's going on also.  
The hose leading from the evaporator (inside the passenger 
compartment) to the compressor, or "low side" hose, should get cold.  
The "high side" hose from the compressor to the condenser should get 
hot.  These are quick checks that can help give a quick idea if it's 
at least semi functional.

The "feel" test, other than having gauges on both the low and high 
side to observe pressures, is the best diagnostic toll you can use.  
The hose from the compressor to the condenser should get really hot, 
the hose from the condenser to the dryer a little less hot, same for 
the one form the dryer to the expansion valve.  The other side fo the 
expansion valve should be cold as hell, the hose from the evaporator 
to the compressor a bit less cold, as the cold should have been blown 
into your passenger compartment.  The whole thing is based on 
pressures and compressing and expanding the gas.....it's kinda neat 
when you get into it.

> I've still got a couple of cans of Freon lying around from Back When We Didn't 
> Know Any Better, and the recharge kit that included that swell gauge.  Seems I 
> recall that the compressor had to be compressing for the gauge to read 
> anything meaningful (of COURSE I lost the instructions; sheesh); does anyone 
> else recall the same thing?  Supposing it did spring a leak; how many cnas 
> would it take to get it back up to snuff?

I couldn't find capacities for the a/c in Bentley, it only says never 
add more than 3 cans.  Somehow I seem to remember reading somewhere 
the capacity is about 2 to 2 1/2 lbs.  Sometimes you'll find a label 
on the compressor telling you the system capacity.  The best way to 
know when it's full is to watch the sight glass located on the top of 
the receiver/dryer which is underneath the windshield washer resevoir 
(sp?).  You fill it until the sight glass bubbles disappear.  A 
little note, let the compressor cycle a few extra times to be 
sure all the bubbles are gone, and then give it just a a little 
extra shot of freon to account for the loss you'll have when 
removing the fill hose and gauge.  Yes, it will only give meaningful 
readings while the compressor is running and will only suck in freon 
while engaged.

BIG ASS DISCLAIMER..........If you're not 100% sure you can tell the 
low side hoses and gauge hook-ups from the high side, DON'T F**K WITH 
IT!!!!!  Serious bodily harm can and will occur if you try to hook 
the gauge and cans up to the high side.

> Wouldn't be so big a deal if I didn't live in Columbia, SC, home of the Sweaty 
> Christmas.

Awww, quit yer bitchin :)  

BTW, how many cans of freon do you have sitting around?  I could 
really use one to top off my system....hint, hint :)   Would gladly 
overpay for one of these little beauties *grin*

If you have any more questions. I'll be glad to try and help.  I used 
to do a/c work in a garage in a former life.

Hope this is of some help......of course if the compressor doesn't 
engage then you have an electrical (relay?) problem......which would 
be cheaper to fix anyway, and less dangerous.  Check the grounds from 
the compressor, mine was disconnected and preventing mine from 
working.  

If the problem is low (or worse no) freon, you had a massive leak and 
it may be costly if it's a major component.  Keep the fingers crossed 
for electrical probs :)

Rick    
hugacub@whidbey.net
Richard.Lackner@entex.com
85 Scirocco 8V  Wolfsburg
Everett, WA
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