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| [GMCnet] Re: Dash air conditioning [message #364814 is a reply to message #364813] |
Fri, 18 June 2021 08:10   |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma:
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Tom,
First off about the already-done conversions from R-12 to R-134A: If the
mechanic did it properly, he did all the flushing, etc., you describe as
possibly needed now. I wouldn't plan to do all that again unless you've
had a compressor failure, possibly polluting the system, since then.
For the "new" system, I strongly recommend one of the hydrocarbon-based
coolants, Freeze-12, Duracool, etc., for several reasons. First off
they're generally cheaper. Second, they cool better than even R-12, and
much better than R-134A. Third, they're compatible with all approved
compressor lubricants (unlike R-134A which required removal of all traces
of the R-12 oil). Fourth, they require less compressor "head pressure" in
operation, reducing the load, and expense of A/C operation and reducing
wear. The concerns expressed by some of putting "flammable propane" in the
cooling system ignore the fact that R-134A is just as flammable when mixed
with its oil, and generates worse combustion products. Besides, when was
the last time you heard of an "air conditioner fire"? :-)
If you can find a GM vehicle (late 90's vans?) with a Sanden-like
compressor, it may have GM compatible connections directly usable with your
existing hoses. Failing that, any good A/C supply shop can adapt 'most
anything to anything with new or modified hoses.
That's been my experience. Now, I need to go out and refill my system with
Duracool. It had run for about 5-6 years without "topping off" but was
beginning to cool less well when the pandemic shut down all interest in it
for 18 months. It's now nearly empty. And I had to order new hoses for my
manifold set; after only 20-30 years, one of them began to leak. :-(
Ken H.
On Fri, Jun 18, 2021 at 8:50 AM tom geiger wrote:
> So I’ve been reading some previous postings on new dash air-conditioning
> compressors. I’ve got the document of the new compressors that will
> work. What is not clear with the document is will these compressors work
> as a direct drop in with the v-belt pulley?, and is the A6 hose manifold
> connect to them or is there mods for that? I paid a local mechanic to get
> my A6 system converted to 134a. He was all about the A6 compressor and
> convinced me to keep it. Well it never worked very well so now I want to
> get the A6 pulled and get a new one in. So as I read I want to flush the
> system, add new oil to the system, (not sure what’s entailed on that), get
> a new dryer installed and air pressure the system to make sure it hold
> pressure. Not sure of the sequence of these. Is there other documents I
> can read that describes the complete conversion process to operation? I’m
> understanding the damper conversion process pretty well, it’s just the
> compressor swap I’m not clear on.
>
> Thanks,
> TG
> --
> Tom Geiger
> 76 Eleganza II
> KCMO
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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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