Top 20 Coleman Mach III Air Conditioner Questions & Answers

Yes you do so it only runs on ac ,but when you said rooftop unit do you mean condenser or does unit have evaporator fan too

Sorry we have no referral service here or anyway to locate the parts for you. That said my friend had to have his custom made. He is in Calif and I don't know where he had it made.

needs freon

If you Google airxcel.com, you should get some options. to get either their literature or tech support and they should be able to help you.

low speed relay issue or bad fan motor

the motor should have wireing diagram on side. i would expect 2 of the wires go to a run capacitor & the other 2 are your 110 or 220 depending on unit need.

Mach I unit

any rv parts supplier should be able to order it.

You should be able to hear the compressor kick in. If you don't the most likely culprit is the capacitors. I generally keep spare capacitors on hand at all times, because they are mostly likely to fail on a holiday or a weekend when it is 102 in the shade. If replacing the capacitors doesn't work, you want to look at the thermostat. You will have to look up manuals and testing for your thermostat. And if those things doen't solve your problem, sadly and lastly, you will want to do troubleshooting on the control module in the ceiling. The control module generally resides in the ceiling and you access it through the vent in the ceiling. Here is where you can find manuals for your a/c unit. Click on the links under the tab for technical information. Airxcel RV Products Good luck!

have to remove cover to access drain lines to clear

relay, capacitors,thermostat,check to make sure you have 12 volts dc at unit,

The Mach III has very small drain holes in the pan which can be accessed by removing the cover. Mine doesn't have a hose, but it is on a motorhome, not on a pop up. Does yours actually have a hose? If I was going to try this with mine I think I would try to use air line tubing like you use for aquariums and feed a sufficient length of it into the small drain hole to hold it in place. You can probably also get small plastic clamps (think electrical coax clamps or maybe 3M command widgets) to hold it down so it doesn't come dislodged. It won't cost much to try this theory, but you want to watch that it is draining properly, because if it doesn't then it will leak inside through the gasket.

internal temperture sensor or thermostat

high speed relay or bad fan motor.

It may be a defective switch, loose or corroded contact connection point, where the wire meets a terminal. If these check out good, then the fan motor is defective and needs to be replaced with a new one.

Check contactor in condensor,if it looks good check refrigerant levels if you're EPA liscensed.

r-22

bad safety on compressor.

pull cover of a/c on roof is best way to find location

outdoor air does not matter as much as return air temperture. your compressor is not running if you only have a 2 degree drop