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Old 07-14-2015, 05:21 PM   #1
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Air conditioner/Front

Our front air conditioner seems like it doesnt want to turn off. We have it set on 79 and it will run all day long and the fan is set to auto so it not the fan running all the time cause it is blowing cold air. And we do get cold with it set at 79. The back ac cycles on off like it should. If anyone has any idea what might be the problem your help would be most appreciated. Not sure if it would be the thermostat or not or a sensor.

Dennis & Brenda
2006 Alpine Coach 40Fd Limited
2014 Cadillac Srx
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Old 07-14-2015, 07:13 PM   #2
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You describe the Fan as set to Auto. Please clarify your problem. Do the compressor and the fan both stay on continuously? Slowly raise the thermostat. The fan and the compressor should both turn off.

turn the A/C off at the thermostat. Does everything turn off? Set the Fan to manual, does it run by itself (no compressor)?

You should have some idea of what is wrong by now.

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Old 07-14-2015, 08:03 PM   #3
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My front AC has always run more than the rear.

I believe one reason for the rear turning off & on more frequently is that the sensor in the rear is really close to the duct outputs. The output ducts are all fairly close to the return (relatively speaking). We close the closest duct to get a little more accurate performance. Keep in mind that the rear area is quite smaller than the front.

The sensor for the front AC is mounted on the wood side board above the DS chair. The sensor should also have some insulation taped across the back side to prevent inside or outside temp influences (that sensor is close to the DS window!). We never set the AC below 80 because the DW thinks it's too cold. We also use a weather station inside which displays the inside temperature as well as the outside. If it''s really hot outside (even inside our garage at 110+) they will both run pretty much full time. Eventually they will start cycling when the outside temps gets down to about 100 or below.

Also, the AC units will shut off the compressor but keep the fan going when reaching target temperature. If the temperature starts to rise with just the fans running then the compressor will come back on with the fans continuing to run. I have to listen carefully to hear the compressor shut off since the fan still makes plenty of noise. We changed the return vents to "baffles" manufactured by Classic Coach Works in Lakeland, FL to reduce noise & increase efficiency. Helps a little.

Do as bill suggested and slowly raise the target temp setting to determine at what point they turn off.
Bob Bowers (Surprise, AZ)
2003 Alpine Coach 40' FDTS
2014 Jeep Cherokee Lattitude
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Old 07-15-2015, 07:25 PM   #4
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The temp sensor locations make the dual temperature settings on the thermostat tricky on our Duo-Therm 15,000 BTU units. The rear sensor is close to the air duct and cools quickly. The front sensor is on the driver side above the side window and is easily heated by sunshine and ambient air influencing the reading to the thermostat.

So, I set the thermostat for the rear to a much colder than desired temp to keep the AC on long enough to reach the desired temp and the front thermostat to a higher than desired reading to allow the AC to cycle at a comfortable temperature.
2003 Alpine Coach 40MDTS - 400HP Cummins ISL
Can Am Spyder Roadster
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