Quote:
Originally Posted by jlarocca
I have the opposite problem from the OP. My Montana Mountaineer 346LBQ stays plenty cool up front (we have a bedroom A/C Unit) and the living room and back bunk room are hotter than hades. The unit came with a 13.5K unit and I had them upgrade it last summer to a 15K and it is still uncomfortable in here. My whole family winds up sitting in the front bedroom. I'm down on the Gulf Coast right now and it's in the upper 80's and its miserable in here. The air flow out of the vents through out the unit seem to be pretty decent and the air coming out is plenty cold it just won't cool the unit. Doesn't even catch up at night after dark? Suggestions? I've had this thing in multiple times for this issue and to two different dealers and they say the units are working fine.
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If the rig has been in the shop several times for this problem and two different shops have assured you that the A/C is working normally, then I would start to look beyond the A/C units.
First, though, does the main unit have the capability to pull in outside air? If it does, you'll want to make sure that is closed all the way so that you are only recirculating inside air. Our cars and trucks work the same way. Hit the max button and the recirculate light comes on and the outside air intake is shut off.
Secondly, is the trailer closed up tight? If there's open windows and/or doors, you're constantly heating up that colder air. I'm not saying you are doing that, but more asking that you look at everything.
There may be a source of hot air that is overlooked. The cold air return on my furnace kind of draws on the basement of the trailer as well as the living space. In the cold weather, I make sure that is closed up so I am pushing cooler air only from the interior of the trailer back to the furnace for reheating. Same principle applies for your A/C. If there's an open path into the basement, and maybe even on to the outside, you could be pulling a lot of unwanted warm air into the right.
Put a thermometer on the output of the bedroom A/C and determine what temp it puts out. Then do the same on the main A/C. They both should put out about the same temp.
There's a vent control on the plastic face of the A/C. Slide it one way, and you get a tremendous blast of cold air out that panel. Slide it the other way and the air flow stops and more cold air is pushed to the other ceiling vents.
On the topic of the ceiling vents, we're had several folks report blocked heat ducts resulting in poor heat circulation in colder weather. I think it is worth doing your own check on that for the A/C ducting. Drop the round plastic covers off the vents and use an electrician's fish tape to make sure the ducting is clear of any obstructions.
Lastly, check the main thermostat for accuracy. You may find that it needs to be set lower than is indicated on the panel. I've got the old Duotherm slider type in my Cougar, and the temps printed next to the slider have no obvious relationship to reality. I keep reminding myself that I need to do the digital upgrade soon.
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