04 Coleman Mach AC not cold

[CMH]

I have the above listed AC in my trailer and it will not get cold. I did not use it for about a year and a half. Then fan works and occasionally the condenser will turn on. The unit will not get cold. What should I look forward to replacing or checking? The unit was hardly used so the fins and the unit is clean. Looking for some direction.

Thanks

[j-d]

If you'll follow Chris Bryant's Article you can open up your A/C unit and inspect for anything looking odd. If you get it running and carefully feel the metal tubes into and out of the compressor, find out if one is hot/warm and the other cool/cold. Smaller one should be the hot one, larger one the cold. The back side of the radiator-looking core (visible from behind) is the Condenser coil and should be warm. You'd have to dismantle some of the cabinet (as Chris explains) to get at the Evaporator but it should be cold.
What I was thinking electricity-wise was to look at the Running Amps rating on the compressor plate. There should be Starting Amps (a peak reading you can't read with an ordinary ammeter), Running Amps (that I'd like you to measure and compare with rating), and Locked Rotor Amps (which'd mean a Stuck/Seized compressor).
This ammeter from HarborFright for $12 on sale will clamp over one wire leading to the compressor and give you a reading to compare with the Running Amps on the plate.

[Bonefish]

Don't have your model but ours has a settings for:

Fan - runs fan only to circulate air (thermostat has no effect).
Auto - fan and ac compressor cycle on and off together.
High fan setting where the ac compressor cycles but the fan stays on all the time so the coil does not freeze up in high humidity.

The key is can tell if the AC compressor is cycling on and off. If the compressor is not coming on then it will not cool.

[CMH]

Hi. I turn the fan on first and then put the thermostat on cool. The AC fires up and it continues to run with the thermostat set to the coldest 55 but never gets cold. the AC unit is running with the fan on. It has a wall thermostat with a moveable lever to the temperature. I can check the voltage but I am not sure what to look for. Thanks

[j-d]

Please explain the "occasionally" Does it mean that the unit cycles on its own but not often enough to cool your fiver? Or that it only starts one time after many when you turn it on? Does it have a wall thermostat or knobs on the unit? Are you willing to dig into the unit, up on your roof? To open it up and get some current readings with a clamp-on AC Ammeter?