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Old 08-06-2011, 06:29 PM   #1
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87 PaceArrow W P30 Air Conditioning Volume

Hi, I have a 87 Pace Arrow on Chevy P-30 Chassis. I seem to have the ARA Manufacturing Front A/C system. It has converted to run R-134 but I have not been able to find the proper amount of refrigerant to charge the system with. There is no site glass I can see. I do have a small leak as I need to put a can in about every couple of months.

Anyone know the proper amount?


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Old 08-07-2011, 09:09 AM   #2
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In order to charge the system by volume you would have to completely evacuate the system then refill it. You can charge it by pressure if you have guages. I'd suggest adding a can of 134 with dye next time you need it then either buying a UV detector or taking it to a shop.
The sight glass method on 134 is not accurate as a fully charged, properly working system will still show bubbles.
Have you inspected all the fittings, especially the schrader valves for oil residue?

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Old 08-07-2011, 10:32 AM   #3
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Find the leak and repair it first. Then you need a set of gauges and charge by the gauges.

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Old 09-04-2011, 03:21 PM   #4
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my a/c while driving does suc it blows warm air not hot my next step run genny while driving and turn on coach a/c any suggestions i will take i got a 1993 fleetwood pace arrow 454 engine the a/c freon did get filled by a mechanic i added insulation to my doghouse that kept engine noise down abit and heat.
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Old 09-04-2011, 04:26 PM   #5
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my 1985 with r-12 still going strong i still can get r12-a localt for $13 a can
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Old 09-07-2011, 01:05 AM   #6
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I agree with locating and repairing the leak first. The reason is you are probably losing refrigerant oil also so the compressor may eventually lock up.

Did you look for the drier by the condensor in front of the radiator. The drier is about 6" tall and 3" around generally. This is where the site glass might be.

If no sight glass you can tell fairly close using gauges. Add refrigerant, watch the high side gauge and monitor the temperature out the dash vents. My '87 Itasca with 454 runs about #225 to #250 on the high side and vent temp is about 40'. This is with 2 auxillary fans running on the condensor.

There is a percentage of R-12 to 134a but I can't think of it right now. If I remember it I will post it. Darn CRS!

Good luck.

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