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Old 09-22-2022, 03:59 PM   #1
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Air Conditioner

We have a 2012 Newmar Class A. It has two air conditioners. The rear AC keeps the bedroom and bathroom nice and cool. The forward AC is pretty much useless. It was putting out some cold air, but it was super weak. The forward half of the coach wouldn’t get below 84 degrees.

Any suggestions? Do I need a new unit?

Thank you in advance.

Jeff
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Old 09-22-2022, 04:24 PM   #2
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First thing to do is to look at the volume of the two areas you are cooling. The bedroom/bath are typically a fair amount smaller than the front part of the RV, so it is easier to cool.

Next is the front part of the RV has the big windshield and more windows thus much more heat gain than the back part of the RV.

Check the performance of the A/C unit by measuring the air temperature at the inlet to the unit and the outlet closest to the unit. Run the fan on high speed. DO NOT use an infrared temperature gun to try and read the air temperature. Use a real thermometer or a thermocouple. The infrared sensors read radiated heat from a solid surface and not air.

You should get the air outlet 18 to 20 degF lower than the inlet air temperature. This has nothing to do with outside temperature.

If you get the 20 degF across the unit, it is doing all that it can do. The problem is that the heat gain into the RV is exceeding the capacity of the unit for that end.

To help the front unit, you can get a small fan and set it in the hall to blow cooler air into the other end. Or the other thing to do is get the RV into a shady area.

Before you start running temperature test on the units, be sure that the air filters and evaporator coil are clean. Filters need to be cleaned every 2 to 4 weeks of use and the evaporator coil should be checked yearly.

Ken
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Old 09-23-2022, 12:02 AM   #3
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By super weak, do you mean a low volume of air is coming out? If so, as suggested, check filters & evaporator coil. If those are good, look at the foam rubber seals around the blower & evaporator coil. Make sure the blower is blowing well. Some seal that whole area in the AC unit with the reflective silver duct tape (not the fiber duct tape).

Then, run a scope into the duct to be sure nothing is blocking it.

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Old 09-23-2022, 02:53 AM   #4
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Quote:
Originally Posted by DRM901 View Post
By super weak, do you mean a low volume of air is coming out? If so, as suggested, check filters & evaporator coil. If those are good, look at the foam rubber seals around the blower & evaporator coil. Make sure the blower is blowing well. Some seal that whole area in the AC unit with the reflective silver duct tape (not the fiber duct tape).

Then, run a scope into the duct to be sure nothing is blocking it.

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Correction: assuming you have good air flow when the rear AC is working, then the filters should not be a factor.

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Old 09-23-2022, 02:21 PM   #5
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Which units do you have? I have Coleman 4900 series and just had to replace the blower motor on my rear unit. The indoor blower wheel is a large squirrel cage with the blades very close together. They were really gunked up. After cleaning it I have noticed a large increase in air movement. I plan to look at the front unit if we ever get out of this 95 deg heat wave.
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Old 12-05-2022, 06:07 AM   #6
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This can be caused by a broken control board, start/operating condenser, motor, outdoor unit fan, or the inter-unit connection. Also, the main reasons for such malfunctions are lack of freon, compressor overheating, and clogged external unit radiator.
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Old 12-08-2022, 10:19 AM   #7
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This can be caused by a broken control board, start/operating condenser, motor, outdoor unit fan, or the inter-unit connection. Also, the main reasons for such malfunctions are lack of freon, compressor overheating, and clogged external unit radiator.
Winding resistance measurements, starting currents, freon pressure, and dirty radiator are necessary. The cause of insufficient cooling can be determined by the hvac contractor. I'm sure you should contact the master because the poor operation of the air conditioner can affect your health.
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