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Old 10-13-2018, 09:21 PM   #1
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Default Air conditioning question

Getting the overhaul started on my 1978 Hi-Lo. hooked it up to power on a 1100 power inverter that is solar powered. Lights and refrigerator seem to be working. The roof AC doesn't seem to be working. Tried to pinpoint the circuit for it and the closest I found is a 20 amp. breaker. It was on, but I had nothing coming from the AC unit. Anyone here have any experience working on a unit this old?
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Old 10-14-2018, 09:09 AM   #2
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Haven't worked on a unit this old, so I'd have to ask the question, is it plugged in?
Follow the power from the A/C backward. You'll find the problem.
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Old 10-14-2018, 05:56 PM   #3
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I am a total newbie to travel trailers. Had one once parked at a campground for a few years and that is it. I was checking out the electrical system and it looks like there is both a 12V system for interior lights and a power converter for 110v. There is a plug outside above the kitchen window adjacent to the AC unit that says only connect 120v service to it. Is this the power source for the roof AC? Looked at the 1977 manual that is on this site as I do not have one. I am not seeing it there.
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Old 10-14-2018, 06:18 PM   #4
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photo, Like I've said, never worked on a Hi Lo this old but I have seen older ones that had a coiled or flexible power cable going to the A/C. I'd suspect that's the power source. No idea what the plug ends look like.
I thought someone with an older unit would have piped up by now, but they must all be camping! Hope any of this helps you out. Is there an outlet almost directly below the one you see, on the lower half? Pretty sure the lower feeds power to the upper plug. Just need the cable if so. Might be in a storage bin somewhere.
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Old 10-14-2018, 10:20 PM   #5
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Default AC cord

I have a 1990 25ft. HiLo. My AC cord is tucked in an outside compartment on the drivers side. You would pull it out and plug in to the top half exterior outlet. Then you raise the unit up. Go inside and turn the roof top AC on. Hope this helps you.
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Old 10-17-2018, 05:57 PM   #6
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Sam, you were correct. That supplies the power to my rooftop AC. However, the motor will not turn. I can hear it trying and shut it off. Tried to turn the wheel and it is seized. Now to figure that out next.
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Old 10-17-2018, 09:22 PM   #7
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Default AC unit fix

Probably better to replace it. Given how hot and humid it was this past summer. You might get lucky and find a used one from a totaled unit or something off craigs list. I had to replace mine a few years ago as parts were no longer available.
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Old 10-18-2018, 10:12 AM   #8
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Right now I am doing an overall evaluation of what needs to be done to get this camper usable. Not sure what I'll do about the AC. It is a 78 that I picked up for $200. Has had leaks. Most of the ceiling is good except the rear around the vents. The majority of leak damage is to the walls. Tried to get the hot water, furnace and propane refer to work. Have only got the stove to work on propane so far. Refer seems to work on 110v. I have it parked in a pole barn while I work on it.
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Old 10-18-2018, 04:47 PM   #9
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My A/C would hum and not run. Took the A/C cover off and found that a mud dauber had 'cemented' the outside fan to the housing. Removed the dauber nest and everything worked. Hope this helps.
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Old 10-18-2018, 06:15 PM   #10
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Thanks for the info Dee. I will check that out.
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