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Old 09-13-2012, 07:07 PM   #1
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Join Date: Aug 2010
Posts: 363
2004 Endeavor rear AC

2004 Endeavor rear air conditioner with a Duo Therm 13,500 BTU low profile. I had run the AC with the fan continuously on. (Outside temperature was 90 degrees and the thermostat was set at 72 degrees) between the normal cycling of the AC by the thermostat, I noticed the air coming from the ceiling vents was as if the heat pump was on.

If I lowered the thermostat the compressor came on and there was cold air from the vents but not real cold.

I shut down the AC rear unit via the thermostat but left the fan on continuous running at high thinking that the AC may had froze up. About an hour later I turned the rear AC back on and after an hour started to act up.

I then via the thermostat shut down the rear AC including the fan. At that time I could hear the compressor running (noticeable humming). I then shut off the thermostat and the rear AC still hummed. The only way I could stop the humming was to flip the rear AC electrical circuit breaker.

The next day I had to run the rear AC as it was in the mid upper 90ís. I ran the fan as a continuous run on high. All was working properly. When I shut the rear AC down via the thermostat there was no humming from the compressor.

I have been advised on top of the compressor is a starting switch which is molded into the compressor and this switch is not severable.

Is this true? Any other possible causes?

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Old 09-13-2012, 10:57 PM   #2
"Formerly Diplomat Don"
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Join Date: Apr 2005
Location: Moorpark, Ca.
Posts: 16,301
Robert T....My Dometic Heat pump (rear air) in my 05 Diplomat was doing something similar. It would more often than not come on hot, like the heat pump was on. After posting here, I was told that the system defaults to the heat pump. There is a reversing valve with a solenoid that sits atop the valve that reverses the flow when you turn on the A/C. When it's malfunctioning, it will want to go to heat pump mode.

I went to the PPL website and located the parts for my A/C unit by serial number. The reversing valve was still available. It's simple to install. Unscrew the old one (single screw) and screw on the new one. It's located right on top of the unit when you remove the cover.

I now cycle that rear unit on more often to keep that valve from going bad.
Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
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Old 09-14-2012, 08:13 AM   #3
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Holiday Rambler Owners Club
Join Date: Jan 2011
Location: Hebron Illinois
Posts: 114
rear air unit

Same problem with our 2003 Endeavor. Humming noise after running a while.Blowing warm air. Turning off the breaker was the only think that would stop the humming. Our air unit was a Dometic. Took it in for service ( we have an after market warranty). They found a split in a coolant hose. Bottom line is they replaced the whole unit. We had to pay for shipping of the new unit, and a thermostat retro kit. Our out of pocket was around four hundred. Total bill was around two thousand.
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