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Cruise Air Issue
I hope someone can explane this one. While coming home from a trip out west my bus air stoped working, which turn out to be a low pressure switch leaking. So after the OTR pooped out I started the generator and started up the salon and galley cruise air’s. They ran about 5 minutes and both just shut down like a switch had been shut off, the thermostats were blank, no codes showing and the switches on the dash to turn the power on were off. I then turn the dash switch for the salon back on and about 5 minutes later off it went, then I tried the galley a/c and had the same results. The bus is at Prevost Fort Worth at the moment, to fix the bus air, so I went out and ran the 3 cruise air’s off the shore power with no problems, then I started the generator and ran the 3 cruise Air’s off generator power with no issues. So why won’t they run off the generator while driving down the road, makes no sense to me. Any thoughts would be appreciated.
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10 Replies
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The short answer is “their hi pressure switch(400-425psi)” shuts them down due to high outside/road surface temps. The condensors live near the road surface. Cruisairs don’t like that.
On my coach if this happen I would get a code on my SMX control like “HI PS”.
1999 XLV X-6872, liberty #440 -
Same here, highway temps too hot and the’re shutting down. My displays will stay on and show high pressure.
Mark – I assume when you mention your bus is at Prevost for over the road air problem, you’re talking about CC air and not OTR, correct? The reason I ask is previously Prevost wouldn’t work on CC air being converter installed.
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I run my cruise aires when needed. So far they have not shut down. On Prevost Service, I was 30 miles north of Goodlettsville when the first evidence of my inside coolant flood occurred. I stopped at a Volvo/Cummings Shop and was told I’d have to go back to Prevost at Goodlettsville. So I called and was very curtly told it was not a Prevost system and they would not work on it.
Well several years ago when returning from OKC, I had an intermittant loss of power. Went toGoodlettsville and their tech spent a couple of hours banging on turdo tudes since that is the primary source of loss of engine power. NOT. Anyway as I left and returned to I-65 the next morning, the same old loss of power occurred. I went home, much lighter in the pocket book and with the same problem. I got home changed the fuel filters and the problem went away. So be advised Prevost may not always have the answer and will work only on the Prevost systems.
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Tom, Mark’s is a Marathon. I’m assuming Prevost will be willing to look at his dash air?
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Driver’s air (or dash air) is a Prevost system. They should have no problems working on it.
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Tom, mine is OTR or total bus air, it will run the whole bus and takes up the whole 3rd bay. The problem they found with it was a leaking low pressure switch. When you guy say its too hot for the cruise air’s while running down the road, is that the time that you need the misting systems that I heard about. Tom also if my thermostats did indeed say HI Pres before shutting down I didn’t see it.
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Oops, my fault, I was thinking CC and not Marathon, that’s what happens after 3 days at ETLC, you fail to even remember your own name.
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Hmm, can’t remember his own name and it appears he cannot remember to hook up the dump hose before hitting the Black Dump button either.
Maybe having a Marathon system, unlike the Rose Petal Dispenser of Liberty fame, he got gassed from the strong gasses eminating from the Black Tank.
Just saying !!
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Fred, do you see my finger?
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The ETLC stay may have messed up more than his deck shoes. As you can see he is now posting as Admin and isn’t adding a signature.
Jeff and Lindsay
91 Marathon XL
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