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Old 07-29-2014, 11:11 AM   #1
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1987 32.5' Airstream 325
dripping springs , Texas
Join Date: Mar 2014
Posts: 142
Dashboard AC question

OK folks, I've been struggling with a 134 conversion of my Dash AC, and have the following question for anyone who has a working dash AC:
My clutch pulley has 2 belt grooves, should there be 2 belts or just one? Thanks!

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Old 07-30-2014, 09:24 AM   #2
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1991 35' Airstream 350
Laurel , Maryland
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I converted my 91 350 LE to 134 and I have 2 groves but only 1 belt. Click image for larger version

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Old 07-30-2014, 09:35 AM   #3
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2009 27' FB Flying Cloud
1991 35' Airstream 350
Siloam Springs , Arkansas
Join Date: Oct 2006
Posts: 1,490
I am in the middle of this process.

My '91 350 LE has two groves and one belt.


Jeff & Cindy
Hunter RIP

'09 27FB Flying Cloud
'91 350 LE MH
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Old 07-31-2014, 11:26 AM   #4
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1991 30' Airstream 30
San Francisco , California
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Posts: 415
My 91 300le dash AC is not working, and the compressor is making a nasty sound. Has anyone done a DIY on the conversion?
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Old 08-07-2014, 07:38 PM   #5
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1986 34.5' Airstream 345
Pittsville , Maryland
Join Date: Sep 2013
Posts: 53
I have told that you can drop in 134 without doing any changes just dump the 12 and pull vac . The best way is fix problems with old system and find some 12 it works a whole better than 134 . I know you don't believe me so call National Refrig the people who make 134 and ask them .
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Old 08-07-2014, 08:03 PM   #6
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1987 32.5' Airstream 325
dripping springs , Texas
Join Date: Mar 2014
Posts: 142
I like the idea, read an article with similar concepts (5 yrs life with a 12/134 mix). My problem (and I have 2 cans of 12) is that I can't get the system to work at all with 134, so don't want to waste the 12....

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Old 08-07-2014, 10:31 PM   #7
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1982 28' Airstream 280
Port Angeles , Washington
Join Date: Aug 2008
Posts: 1,191
Your system is pretty simple in that it pressurizes refrigerant, reduces the pressure and removes heat. In doing this the refrigerant changes from a gas to liquid and back and fans remove heat inside the coach and other fans remove more heat in front of your radiator. Some refrigerants are more efficient than others but that is another very long discussion.

If you take the air hose from your compressor and blow air toward your hand it feels cool. This is the same rapid reduction in pressure in it's simplest form.

You need to get a 134a manifold gauge set (because you have 134a in the system) and check the system to see if you are making pressure on the high side and reducing pressure on the low side. If not then you can troubleshoot the system to find the problem.

Cheers, Dan

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