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Old 08-03-2021, 01:25 AM   #1
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Join Date: Aug 2021
Location: Walla Walla
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Temperature sensor

Hello all. I own a 2012 3750FL and had to have my AC replaced. It now isnít working correctly and have the mobile guy coming back out. My question though is where is the sensor for the front living space? I found the bedroom one but canít find the living room.
Any ideas? My inside reading was 83 and the AC was set to 74. It got cold and loud and I had to turn it off.
Ideas on how to make it run through the ducts better as well? Only really cools the apace when dumped down in the kitchen.
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Old 08-03-2021, 06:14 AM   #2
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if you have the curved ceiling then the returns might have collapsed a bit. there should be about 2-3 inches of clearance. we have a 2016 and the same issue. plenty of youtube vids on the fix, basically get 1-1/4 PVC cut them to about 12 inches and place in the return between ceiling and roof to open the return. made a huge difference in our. as for the sensor cant help on that one.
2016 Ram 3500 DRW pulling 2016 Montana 3720RL
living in UT. wandering around with my best friend (38) years married and the royals (2 Saint Bernard's)
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Old 08-03-2021, 06:28 AM   #3
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In my case, the temp sensor appears to be in the thermostat itself. No remote sensor that I am aware of. I replaced the original Dometic CT thermostats since they were nothing but problems.
If you aren't getting good air flow through the ducts, they may be crushed. GHallof posted a great thread on taking care of this. The basic process involved opening each vent, and pushing the duct back open with your hands. I put in small pieces of 1 1/4" PVC pipe to hold the duct open as much as possible. Position the pipe so that it is inline with the air flow on either edge of the duct. It made a huge difference in the amount of air flowing through our ducts, and they didn't visually appear to be crushed much at all. Since I had the vents off, I also put silver duct tape around each register to make sure and seal the air flow so it doesn't get out into the attic space as well.
Since doing that, I haven't had my rear unit freeze up once. Take a look at this thread for more ideas...
Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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Old 08-03-2021, 09:46 AM   #4
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If it has a dump it probably doesn't have the return air duct problem, but make sure that the filter is clean. Our 2010 and our 2013 were ducted but the return air came back to the unit thru the attached filter.
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
2017 3500 Dodge Maxi DRW 4X4, Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, etc.
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Old 08-03-2021, 08:46 PM   #5
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The temp sensor in our 3610 zone 1 is behind the 'crown moulding' on the door side.

2016 3610/2012 F-350 Powerstroke
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