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Old 08-09-2015, 03:06 PM   #1
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Monaco Owners Club
Join Date: Nov 2009
Posts: 371
A/C failing

I have an A/C unit in my bedroom that is putting out cool air at 25 degrees warmer than the front unit. They're the original Dometic units. Is there anyway to recharge these or is it a unit replacement?

And Yes it's hot here in Texas right now😉

Diplomat 40PDQ
Jeep Liberty toad

2005 Diplomat 40PDQ, Jeep Cherokee Toad
Randy, Pam & Rascal (150lb Rottweiler in a Jack Russell Terrier body)
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Old 08-09-2015, 03:24 PM   #2
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Have the FIlter and coils been cleaned lately? That is usually the main things that cause problems with A/C units.
This video might help....

Good Luck,
Richard Smith

2001 Fleetwood Discovery 38F, 2013 Honda CR-V, Roadmaster Falcon All Terrain Tow bar. Magalia, CA, iRV2 Supporter, Member FMCA
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Old 08-09-2015, 03:35 PM   #3
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I agree with checking the filters, etc. However, depending on the age of your a/c unit, it maybe time to replace. RV a/c units are not as a general rule repairable. Replacement is the only way to go. We have always used the rear unit to help reduce the temp in our Discovery. As such, over the past ten years, the first unit to replace was the rear unit. And, again, just now, we have replaced the rear unit again. 114,000 miles. Long time in the coach. Lots of hot places. Just one of those things that need to be attended to if you have an RV.
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Old 08-09-2015, 04:46 PM   #4
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I agree with all. I seriously doubt that that if it is broken that you can get somebody to fix it without paying big bucks. I opened up all my roof AC units and cleaned the coil and it made a big difference.
Mike Canter
"Gunner" USN Retired, Airdale
2004 Monaco Signature 44' Conquest. Detroit 60
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Old 08-09-2015, 06:00 PM   #5
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That is the first thing I would do is clean both the evaporator and condensing coils. Since you have to remove the top AC shroud to clean the condensing coil you might as well access the evaporator from the roof also.

Before you start I would take the AC filter out and put a bunch of rags up into the duct work to stop dirt/dust from coming down.

After removing the shroud you will see the condenser coil which you can easily blow out. There is also sheet metal that encloses the evaporator coil and blower motor fan. You can remove the sheet metal screws and pull the sheet metal up. Then just take compressed air hose and blow air thru the evaporator. Check both of the fan blower blades (these are round squirrel cage type blades) and make sure there are no dirt dobber nests or excess dirt built up. After your done put the screws back in the sheet metal, reattach the shroud and pull the rags out of the duct work.
Jim J
2002 Monaco Windsor 38 PKD
2005 Jeep Grand Cherokee w/5.7 Hemi
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Old 08-09-2015, 06:14 PM   #6
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Replaced my rear 11K AC with a 13.5K one at 13 years 10 months
Replaced front 13.5K at 15 years 1 month with a 15K heat pump

Used since 2002 Full Time

Air temp difference between intake and output should be around 18-20 difference.
99 Discovery 34Q ISB
2014 MKS AWD EcoBoost Toad
Fulltime Since "99"
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Old 08-10-2015, 05:42 AM   #7
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Thanks guys for all the ideas. I'll check my coils. It's been a couple years since I cleaned them but I doubt that will do much judging by my last inspection. I'm guessing it will need to be replaced.

Diplomat 40PDQ
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2005 Diplomat 40PDQ, Jeep Cherokee Toad
Randy, Pam & Rascal (150lb Rottweiler in a Jack Russell Terrier body)
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