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Old 07-22-2014, 03:29 PM   #1
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A/C issues???

So we are on our first long trip in the new Sabre 36QBOK-7. It's really not that hot outside maybe mid 80's. I have my A/C set on 70 inside. I upgraded to 15k main a/c unit and then added the 13k second a/c in the front bedroom.

My question is it runs all the time and can't seem to cool the camper down to 70. Anytime I check the indoor temp it's 73 to 74. I have checked and verified that fan is on auto. One time the main a/c cut off then 2 or 3 seconds later come back on. Then a minute later it did the same thing again. Then in a few minutes it did it again. I checked the indoor temp and it said it was 74 degrees in the camper and the thermostat was set on 70. You can feel a big difference in temperature in the back bunkhouse area verse the main area of the camper. Meaning it's hotter in the bunk house.

Any idea why it would've done this and why it can't seem to keep up. It sounds like you can hear the compressor pulsing or something or maybe better yet it's a on off vibration on the main a/c unit.

2015 Sabre 36QBOK-7
2007 F-350 Diesel FX-4
China Grove,NC

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Old 07-22-2014, 04:00 PM   #2
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Wow, you would think that 2 ACs would make that camper an icebox.

Something is wrong for sure. Can you tell if it is one or the other (or both)?


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Old 07-22-2014, 04:20 PM   #3
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Sabre 36QBOK-7

Is it a 30 or 50 amp power?
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Old 07-22-2014, 04:30 PM   #4
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I have the same unit and also installed a 13.5 up front. I find if you open the dump on the front air and open the center on up 1/2 it will get you to your temp. What is happening is the ducted work is heating up the air in vents causing it to work harder and longer. Direct dump is the way to got in the heat of the day. I have a small fan in bunk area to cool off bunks. Oh and that was in 94 weather and no shade Click image for larger version

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Old 07-22-2014, 06:37 PM   #5
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When you say it's shutting off for a few seconds before it reached temp it's prob just the fan changing speeds from low to high or vice versa. Mine does this. When it's pretty close to set point it will change from high to low but if the temp is going back up then it will switch back to high again.

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Old 07-22-2014, 06:39 PM   #6
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Coolest ours will get when in the 90's outside is 73-74 in the living room. Front bedroom will get colder. 40' rig, 15k unit in the middle, 13.5k in the front. This is after some mods. Deflecter from blower cage to ducts and a few scoops on the living room vents. Not through yet, but this is what ours does so far. During the day we shut 1 of the 2 vents in the front room, and both bath vents. This puts a lot more volume in the living room.

When it's hot, they will run all day.
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Old 07-22-2014, 10:21 PM   #7
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Originally Posted by Ford Idaho View Post
Sabre 36QBOK-7

Is it a 30 or 50 amp power?

50 amp

2015 Sabre 36QBOK-7
2007 F-350 Diesel FX-4
China Grove,NC
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Old 07-22-2014, 10:31 PM   #8
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Due to possible icing I run with all deflectors at the main unit open 12pm till 6 or 7pm. Then I shut the main deflectors and let the ducting route the cool air. I also has a fan going in the bunkroom/sitting area. It tends to get hotter in there.
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Old 08-07-2014, 07:34 PM   #9
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I would suggest a search on the forums for sealing all of your ceiling vents. I went to Lowes and picked up a large roll of Aluminum AC tape. We have a 35QSIK with 2 units. I went through each and every vent as well as the returns on both units. I found numerous locations where the vents were misaligned or just not sealed at all. I also sealed the returns and main AC outputs where they connect to the trunk lines. We can tell quite a bit of difference in just doing that. Before doing this we were experiencing the same issues that you're talking about... Hope that helps.

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