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AC Diagnosis [message #221518]

Sat, 07 September 2013 15:42

Manong

Messages: 88
Registered: July 2007
Location: Madison, WI

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Well, I got my GMC AC working and it blows great. So, I decided to try to fix my other motorhome which is a Coronado on a GMC chassis. I evacuated the R12 from the low side port and out came some stuff that resembled a white cream paste substance along with the R12. Don't know what it is ????
Evacuated it all out (I think) and did a vacuum on the system, vacuum held so it appears there are no leaks.
There are no high side ports anywhere along the high side lines. There is a low side service port on the line before it goes into the evaporator. On the back of the compressor where the lines go into the compressor there are two (what appear) to be ports one high and low. At least they both have shader valves in them.

Any way I vacuumed and put in a can of duracool and the compressor kicked in, so I put more in to bring pressure up to about 25 psi. I put an adaptor on the, what I think the high side is at the back of the compressor but I get no pressure reading. Also when I depress the other valve next to the high, which I think is the low, I also get no pressure. I do get pressure when I depress the valve that I feed the duracool in. I would think that if these two are a high and a low there should be pressure in each one.

The compressor in it is a SanDen SD 709 Model U7499.

Any way when I do the temperature reading the temp drops from the ambient of 80 to 69 as I rev the engine to 1500 and hold at 2000 rpm, so I think something is happening.

Is this a sign that maybe the compressor is failing since cooling occurs better as engine revs?

Manong
Madison, WI

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[Message index]

		AC Diagnosis By: Manong on Sat, 07 September 2013 15:42
		Re: AC Diagnosis By: JohnL455 on Sat, 07 September 2013 21:07
		Re: AC Diagnosis By: John Sharpe on Sat, 07 September 2013 21:45
		Re: AC Diagnosis By: Manong on Sun, 08 September 2013 09:23
		Re: AC Diagnosis By: Matt Colie on Sun, 08 September 2013 10:08
		Re: AC Diagnosis By: Manong on Tue, 10 September 2013 21:24
		Re: [GMCnet] AC Diagnosis By: emerystora on Tue, 10 September 2013 21:45
		Re: [GMCnet] AC Diagnosis By: Manong on Wed, 11 September 2013 07:58
		Re: [GMCnet] AC Diagnosis By: Emery Stora on Wed, 11 September 2013 08:57
		Re: [GMCnet] AC Diagnosis By: Emery Stora on Wed, 11 September 2013 08:59
		Re: [GMCnet] AC Diagnosis By: A Hamilto on Wed, 11 September 2013 12:11
		Re: [GMCnet] AC Diagnosis By: Manong on Wed, 11 September 2013 12:37
		Re: [GMCnet] AC Diagnosis By: James Hupy on Wed, 11 September 2013 13:04
		Re: [GMCnet] AC Diagnosis By: emerystora on Wed, 11 September 2013 14:41
		Re: AC Diagnosis By: A Hamilto on Tue, 10 September 2013 21:56
		Re: AC Diagnosis By: Ken Burton on Wed, 11 September 2013 03:23
		Re: AC Diagnosis By: JohnL455 on Wed, 11 September 2013 15:10
		Re: AC Diagnosis By: Manong on Wed, 11 September 2013 15:40
		Re: AC Diagnosis By: Ken Burton on Wed, 11 September 2013 20:22
		Re: [GMCnet] AC Diagnosis By: powwerjon on Wed, 11 September 2013 21:17
		Re: [GMCnet] AC Diagnosis By: Manong on Thu, 12 September 2013 15:53
		Re: [GMCnet] AC Diagnosis By: Manong on Fri, 13 September 2013 14:54
		Re: [GMCnet] AC Diagnosis By: A Hamilto on Fri, 13 September 2013 15:05
		Re: [GMCnet] AC Diagnosis By: Mr ERFisher on Fri, 13 September 2013 16:02
		Re: [GMCnet] AC Diagnosis By: USAussie on Fri, 13 September 2013 21:41
		Re: [GMCnet] AC Diagnosis By: USAussie on Fri, 13 September 2013 21:34

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