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01-12-2018, 01:31 PM
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#1
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Member
Join Date: Oct 2017
Location: Westbank B.C. Canada
Posts: 48
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Dometic ac on my 2008 Essex
My rear ac ( bedroom ) is only blowing cool air and will not maintain a comfortable temp . Anything simple I could check .
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01-12-2018, 01:43 PM
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#2
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Senior Member
Gulf Streamers Club
Join Date: Jan 2012
Location: Cincinnati
Posts: 19,925
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Take the actual temperature of the air at both A/C units for a true comparison. If the Rear A/C unit is not as cold as the other unit, you can remove the cover and make sure the baffles between return air and 'exhaust' air is still in place. You could also go on the roof and remove the cover of the rear A/C unit and make sure the coils are clean.
If the compressor is running, the above strategies may help. If the compressor isn't running, then about all you could do is replace the starting capacitor. The compressor isn't repairable, it's a sealed unit.
__________________
Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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01-12-2018, 03:11 PM
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#3
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Senior Member
Join Date: Dec 2014
Location: Salt Lake City, UT
Posts: 685
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YOu have heatpumps on the roof. These units switch between heating and cooling with a reversing valve.
The valve is controlled by a solenoid and sometimes that fails, but usually in the heat on position. Sometimes the valve itself sticks and some have had success tapping on the valve to free it up.
Otherwise, these units are not serviceable and have to be replaced.
Search around for reversing valves for more info.
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2006 Newmar Essex 4502
2015 Jeep Grand Cherokee
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01-12-2018, 03:23 PM
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#4
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Senior Member
Join Date: Oct 2012
Location: Foley AL
Posts: 7,138
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Quote:
Originally Posted by Truckergump
My rear ac ( bedroom ) is only blowing cool air and will not maintain a comfortable temp . Anything simple I could check .
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Are you heating or cooling? ... I.E., are you set to Cool or HP?
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2005 Newmar Essex 4502, 2013 Caddy SRX
1997 HR Endeavor 37, CAT, 1996 Geo Tracker
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01-12-2018, 08:10 PM
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#5
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Member
Join Date: Oct 2017
Location: Westbank B.C. Canada
Posts: 48
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Dometic
Quote:
Originally Posted by bruceisla
Are you heating or cooling? ... I.E., are you set to Cool or HP?
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I am cooling , worked good up until this morning . I noticed it was running steady so went to check and it was blowing outside temp. air instead of cold . other two ac’s work great
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01-13-2018, 03:44 AM
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#6
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Senior Member
Newmar Owners Club
Join Date: Jul 2011
Posts: 3,480
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Check your thermostat and make sure the fan speed is set to auto and not some other setting.
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2021 DSDP 4326 Freightliner
2023 Winnebago ERA 70A
2005 KSDP 3910 Spartan
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01-13-2018, 04:32 AM
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#7
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Senior Member
Join Date: Oct 2012
Location: Foley AL
Posts: 7,138
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Quote:
Originally Posted by Truckergump
I am cooling , worked good up until this morning . I noticed it was running steady so went to check and it was blowing outside temp. air instead of cold . other two ac’s work great
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If you turn it off for 10 minutes and turn it back on does it cool for awhile?
Can you hear the compressor start after the fan starts?
__________________
2005 Newmar Essex 4502, 2013 Caddy SRX
1997 HR Endeavor 37, CAT, 1996 Geo Tracker
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01-13-2018, 04:58 AM
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#8
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Senior Member
National RV Owners Club
Join Date: Oct 2014
Posts: 520
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Please check your capacitor. Inexpensive fix and fits symptoms.
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Terry & Kathy
2012 Dutch Star DP 4346
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01-13-2018, 09:52 AM
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#9
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Member
Join Date: Oct 2017
Location: Westbank B.C. Canada
Posts: 48
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Dometic
Quote:
Originally Posted by Sidewinder4
Please check your capacitor. Inexpensive fix and fits symptoms.
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Where is my capacitor and how do I check it
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01-13-2018, 10:11 AM
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#10
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Senior Member
Gulf Streamers Club
Join Date: Jan 2012
Location: Cincinnati
Posts: 19,925
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Quote:
Originally Posted by Truckergump
Where is my capacitor and how do I check it
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On the roof under the A/C shroud.
USE CAUTION The capacitor can hold a charge and knock you off the roof if not discharged before working around. Easy to do, like working with old TV CR tubes, but you do have to be aware.
__________________
Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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01-13-2018, 10:19 AM
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#11
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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Quote:
Originally Posted by BFlinn181
On the roof under the shroud.
USE CAUTION The capacitor can hold a charge and knock you off the roof if not discharged before working around. Easy to do, like working with old TV CR tubes, but you do have to be aware.
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Used to work in a motor rewind shop. Tested a capacitor start motor, unplugged it, then put the cord on the bench. Accidentally put a finger between the plug in's prongs. Won't do that again!
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2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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01-13-2018, 10:40 AM
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#12
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Senior Member
Join Date: Oct 2012
Location: Foley AL
Posts: 7,138
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See here and look at 26 and 31 ....
https://www.caravansplus.com.au/spar...2-p-11846.html
The capacitors are under a metal cover (number 17) on passenger side of A/C.
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2005 Newmar Essex 4502, 2013 Caddy SRX
1997 HR Endeavor 37, CAT, 1996 Geo Tracker
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01-14-2018, 01:57 PM
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#13
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Member
Join Date: Oct 2017
Location: Westbank B.C. Canada
Posts: 48
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Dometic
Quote:
Originally Posted by Truckergump
My rear ac ( bedroom ) is only blowing cool air and will not maintain a comfortable temp . Anything simple I could check .
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Now I am having all kinds of weird stuff happen , In turn on my heat pumps and the furnace come on instead , shut of the boiler and then it kicks over to the roof heat pumps . I think my bus is possessed . I can turn the boiler back on once the heat pumps are going and nothing changes . The reason I have the boiler on is because my heat coils quit working a few days ago and I leave the boiler on for hot water . Have an appointment booked with North Trail RV Wish me luck
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01-14-2018, 02:08 PM
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#14
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Senior Member
Gulf Streamers Club
Join Date: Jan 2012
Location: Cincinnati
Posts: 19,925
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Quote:
Originally Posted by Truckergump
Now I am having all kinds of weird stuff happen , In turn on my heat pumps and the furnace come on instead , shut of the boiler and then it kicks over to the roof heat pumps . I think my bus is possessed . I can turn the boiler back on once the heat pumps are going and nothing changes . The reason I have the boiler on is because my heat coils quit working a few days ago and I leave the boiler on for hot water . Have an appointment booked with North Trail RV Wish me luck
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Try turning off the battery disconnect for the house system, or pull the fuse for the thermostat. Often the kinds of issues you're reporting can be fixed by resetting the thermostat.
__________________
Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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