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Charging AC
It has been a couple of years since I topped up my over the road AC. Do I remember correctly that you open the suction side about 2&1/2 turns and the high side about 1/2 turn. My coach is a 1986 Liberty and I have a sight glass that I watch until the coolant is about midway up the glass.
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7 Replies
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My book says in order to open both the low side and high side, it takes 3.5 turns clockwise each (turn = 360 degrees). You would do this only to pull a vacuum. If you are just charging with freon, then only allow flow into the low (suction) side. Be vintage sensitive.
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I apologize for being so slowin replying. Thanks for the help. I opened the suction side and topped it up with 134A. We just got back from an FMCA rally in Essex Junction VT , Quebec, Bar Harbor &York Maine and while the weather was pretty mild we did have a couple of 80+ degree days. On those days I had the coach temp down to 68 and my wife yelling to “warm it up”. it would be nice ifit didn’t leak but an occasional bottle of 134A is a lot cheaper and less angst than trying to find all of the leaks.
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Actually Chuck lazy people like myself keep eyes open looking for clues.
????How can you see a refrigerant leak????????? I go over my coach from time to time while polishing slack adjusters, brass fittings, and copper pipes and furing those obsessive moments I look at stuff. I expect to see dust that the cleaning lady missed, I expect to see the beginnings of corrosion that I must attack, but I also can see that oil smudge that is around the AC system. Obviously not all fittings, hoses or coils on the OTR or driver’s air are visible, but a large amount of the system is visible and the first clue to where a leak is will be those signs of a little oily smudge. That is a leak.
Biggest and most probable starting point if looking for leaks is rught behind the clutch on the compressor. That seal is a service item. Not a big deal, a couple hours of time and around $100 for the parts. Other leaks often are just fittings that need a little tightening.
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Jon, thx. Just got. Home yesterday from a four week trip and I found a leak around the low side fill valve. It is on my list of “to do’s”. I found a great resource for generator repair / service. I will write a note about them when I have a few minutes. In the meantime the name of the company is Powerhouse Diesel Generators in Valdosta, Georgia and I can’t say enough about them for competence and fairness. Simply put they are the best!!!
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Has anyone seen a video about how to service an over the road AC. My pal had one for his MCI and had the temerity to die and his widow can’t find it. It showed how to pump down the system, test for leaks and refill the system…….. I have converted my 1986 Prevost to 134A and would love to find a copy of the video to use as a refresher as my memory is not getting better as I get older. If anyone has seen the. MCI video or a similiar one for Prevost I sure would appreciate knowing where I can get a copy.
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Prevost has a webinar on the OTR.
Access it through the Prevost web site, commercial side, under maintenance.
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thx Jon, I am looking for it. I discovered that the input valve on the low side of my OTRair has a slight leak and I will need to evacuate it after I change the valve.
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