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| [GMCnet] Re: A/C Question [message #366311 is a reply to message #366308] |
Tue, 24 August 2021 13:32   |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma:
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Senior Member |
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Marsh,
None of your questions really have significant answers -- see them in CAPS:
On Tue, Aug 24, 2021 at 11:49 AM Marsh Wilkes wrote:
> Good Morning Ken,
>
> All I have is a few dumb questions.
> Are the service hoses newer, with check valves in the ends of the hose?
> NEW
> Are the Schrader valve depressors in the end of the hoses screwed out well
> enough
> that they are positively depressing the Schrader valves? YEP
> Does the compressor "sound" like it is running? NO
> Does it load the engine noticeably? NO
> How many cans do you normally use? 3 -- LESS THAN ONE RIGHT NOW
> Is there any noticeable heating of the compressor discharge? NO
> Just hoping for something other than a bad compressor. ME TOO!
> I'm sure some one else will have some other ideas.
> Good Luck with it anyway.
> Good seeing you post regularly.
>
> Marsh (rarely Post) Wilkes
> Perry Florida
>
>
>
>
>
>
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>
> -----Original Message-----
> From: Ken Henderson
> Sent: Tuesday, August 24, 2021 11:02 AM
> To: GMC Mail List
> Subject: [GMCnet] A/C Question
>
> I need the opinions of those more HVAC knowledgeable than I am: Since the
> pandemic kept us off the road for over a year, I find that the A/C no
> longer works (equipped with a Sanden compressor and Duracool, it had
> operated without attention for the previous 5 years or so).
>
> A couple of days ago, I vacuumed the system down to near 30 in.HG. and left
> it sitting until today, when it was still at almost that level. Then I
> moved the vacuum hose to a fresh can of Duracool and opened the valves.
> The low-side and high-side gauges both immediately indicated ~95 psi. Then
> I started the engine and engaged the compressor. Neither gauge's needle
> even flickered! Repeated compressor clutch cycles yielded the same
> results: Click-clack of the compressor clutch and obvious rotation of the
> compressor shaft -- yet NO needle movements.
>
> I took a brass hammer and rather strenuously rapped the compressor (on
> "hard parts") hoping I might shake something loose inside -- STILL no
> needle movement with clutch cycling.
>
> My diagnosis is that I have one of 3 problems in the Sanden compressor:
> 1. A sheared shaft; 2. A valve stuck open; or, 3. a busted piston -- in
> that order of probablility. Does anyone, hopefully, have another/better
> idea? Maybe even one that won't require compressor replacement?
>
> It's looking less and less like I'll really need A/C in the GMC this year,
> but I'd still like to get it working before I get still older and less able
> to tinker, so Y'All's opinions will be greatly appreciated.
>
> Ken H.
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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