[GMCnet] AC Compressor Part#

[Steve]

Im in the process of changing the fan clutch and belts, etc. And decided to charge the dash AC. But I noticed that the AC Compressor is dead.

Anyone have a part# on a rebuilt compressor so I can give it to the "non GMC Motorhome savvy" parts guy at the local parts store?

Thanks,

Steve
--
75 26' GMC Glenbrook
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[Ken Burton]

quadracerx1 wrote on Mon, 17 June 2013 14:18

> Im in the process of changing the fan clutch and belts, etc. And decided to charge the dash AC. But I noticed that the AC Compressor is dead.
>
> Anyone have a part# on a rebuilt compressor so I can give it to the "non GMC Motorhome savvy" parts guy at the local parts store?
>
> Thanks,
>
> Steve

What do you mean by "dead"

Does the clutch not engage?
--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana

[Steve]

Clutch does not engage and it leaks.... So I was going to try a rebuilt unit from the local auto parts store....

[Gary Worobec]

Make sure you get the correct pulley on the A-6. There are several different
widths.


Thanks,

Gary and Joanne Worobec
1973 GMC Glacier
Anza, CA

[Larry Davick]

Jim K has a new replacement compressor - it looks like it's a modern Sandeen unit - lighter and more efficient than our big beautiful A6's.

<http://appliedgmc.com/prod.itml/icOid/1423>
http://appliedgmc.com/prod.itml/icOid/1423

Replacing the clutch and shaft seals is an inexpensive shade-tree task. I have the tools to remove and replace the seals that I'll gladly loan to you. A few fellows have done this job and it's fun. Frankly it was a stretch for me, as I'd never done anything like it before, but had little to loose, so for about $50 I put in the new (improved double lip) seals and happily still have cold dash air 2 years later.
--
Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca

[Steve]

Id rather take my chances with a rebuilt from the local auto parts store... Every time I try to replace seals they leak more than before... LOL So, Just need a part number, ill match the pulley width too. Thanks, for the tip...

[Larry Davick]

Steve,

Not for you, but others on the list might be interested -

Here is a very good link showing the process of replacing the front seal on an A6 compressor.

<http://www.autoacforum.com/messageview.cfm?catid=20&threadid=18627>

I also have some pictures on the photosite of the parts and toolkit that I used on mine
<http://www.gmcmhphotos.com/photos/g5805-a-c-shaft-seal-replacement.html>

The last picture is an excellent diagram that shows the seal on the shaft - the left side of the shaft is where the seal resides.

--
Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca

[Bill Wevers]

I've heard this before:

"Id rather take my chances with a rebuilt from the local auto parts store..."

IMHO the rebuilt A6 compressors are junk.

I wasted a lot of time when I replaced my old A6 with a rebuilt Four Seasons. Their quality is terrible.

I should have bought this new one from Jim K
http://appliedgmc.com/prod.itml/icOid/1423

Just an opinion,
Bill

[r...@gmcnet.org]

quadracerx1 wrote on Mon, 17 June 2013 14:22

> Id rather take my chances with a rebuilt from the local auto parts store... Every time I try to replace seals they leak more than before... LOL So, Just need a part number, ill match the pulley width too. Thanks, for the tip...
>
> Steve

The reason the seal leaks when you replace it is likely there is some wear on the shaft where the old seal cut into it. Larry found a newer double seal that locates on a virgin part of the shaft that shouldn't leak if you are careful when installing it. A rebuilt compressor is not a slam dunk they sometimes don't last a long time.
--
Roy Keen
Minden,NV
76 X Glenbrook

[r...@gmcnet.org]

bwevers wrote on Mon, 17 June 2013 18:05

> I've heard this before:
> "Id rather take my chances with a rebuilt from the local auto parts store..."
> IMHO the rebuilt A6 compressors are junk.
>
> I wasted a lot of time when I replaced my old A6 with a rebuilt Four Seasons. Their quality is terrible.
>
> I should have bought this new one from Jim K
> http://appliedgmc.com/prod.itml/icOid/1423
>
> Just an opinion,
> Bill

Did your junkyard gem from the Chevy truck quit working? I'd be willing to bet it will go another 20 years with the new seals.

--
Roy Keen
Minden,NV
76 X Glenbrook

[John R. Lebetski]

Rebuilt means it rotated on the bench and didn't make too much racket and the black spray can sprayed. Stick with the devil you know.
--
John Lebetski
Chicago, IL
77 Eleganza II
Source America First

[Ken Burton]

Check the warranty on your proposed "rebuilt" compressor. Most of them are 90 days.

--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana

[Bill Wevers]

@roy
Yes, my A6 junkyard gem is still working.
It came out of a 1972 Chevy truck. I replaced the seal
and it has been working for over a year. I must have
removed and replaced my compressor 3 times before
I finally got a good one. So how much money did I save
by putting in a rebuilt/used compressor?

Finding a good used A6 compressor is getting
more difficult. To save time and $money, the newer
design, light weight, S6 compressor looks very attractive.


Regards,
Bill

[Emery Stora]

On Jun 17, 2013, at 3:22 PM, Steve wrote:

>
>
> Id rather take my chances with a rebuilt from the local auto parts store... Every time I try to replace seals they leak more than before... LOL So, Just need a part number, ill match the pulley width too. Thanks, for the tip...
>
> Steve
> --

It not just the pulley width that you have to match. Some have longer "necks" which means that the pulley will not line up with the engine pulley. You have to match up the pulley length from the center of the pulley to the compressor bracket. Many years ago I replaced the compressor with the following:

NAPA 251101
Murray 251101
Everco A8594
329051

Bear in mind that this was about 12 years ago.

I had to match mine to the actual compressor that NAPA had as the necks of three of them with the same part number varied. I finally found the right one.
There are also two options on the compressor a "superheat" model and a "high pressure" model. The GMC is a "superheat".

When I was helping someone else with theirs (again many years ago) I have these numbers from Checker (now O'Riellys).

The problem is that the clutch and pulley assembly varies greatly. First they had a compressor that was
for the Olds Tornado. It had the wrong pulley. The GMC takes a 7/16
inch, 5- 3-4" pulley. We then checked the book and ordered one that
looked right but the pulley was about one inch too close to the
compressor body. I ordered another, 57087, and it was the correct
one.

The Tornado compressor, clutch and pulley installed, was $99.95. The second
one I ordered was $129.95 and the one that fit was $229.95. The only
difference was the pulley as the compressors were all the same.

If anyone wants to rebuild their own, the compressor is 57052 ("superheat"),
the clutch is 48276, the hub is 48241, and the coil is 48245. You'll need a
special puller that threads into the hub to pull it off the shaft so unless
you have or can beg, borrow, or steal the puller, you'd probably be better
off getting the complete assembly, 57087.

It came without any oil. You can install either air conditioner mineral oil
for R-12 or the ester based oil for R-134. If you still have R-12 in your system then use the mineral oil. You'll need about 8 to 10 oz.
depending on whether you drain the condensor and evaporator and put on a new
dryer.

Emery Stora

[KB]

> Finding a good used A6 compressor is getting
> more difficult. To save time and $money, the newer
> design, light weight, S6 compressor looks very attractive.

Anybody try the pro6ten compressor? As I understand it,
both the S6 and pro6ten are modified so they will fit the
standard GM A6 compressor mounts and hoses. The S6 is really a
Nippondenso, and the pro6ten is really a 508 Sanden. Both are much
lighter and (supposedly) more efficient than the A6. I'm told the
pro6ten model 21-2201SH should fit our application. I don't know
if that includes the clutch though. Maybe somebody more knowledgeable
can look at it and comment.

Karen
1973 23'
1975 26'