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05-19-2016, 08:52 PM
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#1
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Senior Member
Join Date: Mar 2005
Location: Northern Oklahoma
Posts: 5,062
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Repairing dash air on late model Class A
I have a 2015 40' Diesel motor home that the dash air has quit working already. I can tell the compressor is not turning, but is turnable by hand so it's not frozen, and the 7.5 A fuse in the fuse box is good.
Has anyone had to have a late model AC worked on, and if so can you remember what part it took to fix it?
Freightliner has told me to take it in to the shop but this may not be possible before we leave on vacation. Guess we'll be using the gen and the roof airs.
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05-19-2016, 09:19 PM
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#2
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Senior Member
Newmar Owners Club Freightliner Owners Club
Join Date: May 2012
Location: Today? Clayton, North Carolina
Posts: 5,093
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Repairing dash air on late model Class A
My dash unit produces neither heat nor cold. I'll get around to fixing it one of these days, perhaps. But that's ok, as its heat is totally inadequate and its cooling is sub-par at best. When cooling or heat is required we run the Gen and the roof units. I have read that this is more efficient, at least for a/c, as the engine driven dash air compressor coupled with increased loading of the radiator cooling fan can sap as much as 40-50 hp from the main engine. Not confirmed.
John & Diane, fulltiming since '12
'02 DS, FL, Cat, '04 Element
NHSO RVM103
__________________
John and Diane (RIP Lincoln, 21 FEB 22) RVM103 NHSO
Fulltimers since June, 2012
2002 Dutch Star 40, Freightliner, Cat 3126, 2004 Element
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05-19-2016, 09:24 PM
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#3
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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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Probably low on "freon". If so there is a pretty good leak or it wouldn't have quit so soon. It usually takes 5 or more years to leak down. Any Air con shop could easily check it with their gauge setup.
__________________
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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05-19-2016, 11:45 PM
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#4
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,311
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JMHO: 7.5 amp fuse shouldn't be large enough to power the whole system.
I'll agree that low freon : or what ever they call it this week ; may be your issue , but that 7.5 amp may not be the only fuse.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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05-20-2016, 10:26 AM
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#5
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,563
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Agree - you seem to have a "freon" (actually R134a) leak, and the loss of pressure inhibits the compressor from engaging (it is designed that way, to save the compressor). Try recharging it with a kit available in any auto parts store/dept and see if the compressor starts up and cools again. A typical problem is simply a leaking o-ring in one of the connections, but it can be hard to find with out pro diagnostic tools.
__________________
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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05-20-2016, 01:05 PM
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#6
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Senior Member
Monaco Owners Club
Join Date: Mar 2000
Location: Yuma Arizona USA
Posts: 2,994
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Something to check since my coach may be different than yours but when mine quit I found a sensor located on the back sided of the firewall that has a probe that is inserted into the fins in the heater/AC core and opens the connection to keep the AC from freezing up. There are two wires attached to this sensor/relay and you can test it by just removing the wires and connecting them together with a piece of wire. If the AC then works you need to replace the sensor/relay. If I remember right I paid in the neighborhood of $20 for mine.
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Brian, Loretta & Lucy (Golden Retriever)
2008 HR Endeavor 40 PDQ , ISL 400
2010 Dodge Ram 1500 Toad
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05-20-2016, 01:19 PM
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#7
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Senior Member
Tiffin Owners Club
Join Date: Mar 2014
Posts: 433
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Quote:
Originally Posted by Gary RVRoamer
Agree - you seem to have a "freon" (actually R134a) leak, and the loss of pressure inhibits the compressor from engaging (it is designed that way, to save the compressor). Try recharging it with a kit available in any auto parts store/dept and see if the compressor starts up and cools again. A typical problem is simply a leaking o-ring in one of the connections, but it can be hard to find with out pro diagnostic tools.
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X4 or is it X5?
__________________
"In the game of life, I have no need for tickets on the 50-yard line, I brought my shoes, I came to play." Unknown
Don and Dale (2015 Tiffin 32 SA with 5ST, CHF, Safe-T-Plus and EEZRV TPMS) RVM106
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05-20-2016, 03:31 PM
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#8
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Senior Member/RVM #90
Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 54,626
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I added freon to my 2002 Windsor, but don't remember exactly how I did it!
The connection was behind the dash, so I could access it by running the generator out!
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Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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05-20-2016, 05:07 PM
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#9
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Senior Member
Join Date: Feb 2010
Posts: 4,654
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Likely low on freon and it should not be being new.
Contact the manufacturer to see what they say.
If it wss out of service for warranty work before clock stopped.
Sometimes you may get some extension by begging a bit.
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Tony & Lori
1989 Country Coach Savannah SE
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05-20-2016, 05:13 PM
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#10
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Senior Member
Join Date: Jan 2011
Location: Pensacola, FL
Posts: 2,457
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__________________
2008 Itasca 37H
2011 & 2012 Len & Pat's "One lap of America"
27K miles & 41 states in 13 months
Yellowstone Lake 6-1-2012
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05-21-2016, 06:07 AM
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#11
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Senior Member
Join Date: Jun 2008
Location: Plano, TX
Posts: 107
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Just had mine repaired yesterday. It had plenty of freon but the compressor would not engage. Checked all fuses and relays and they were good. Took it to the Pros and I was in and out in 1 1/2 hours. Turned out to be the Thermostat was stuck open and needed to be replaced. Must be the $20 part described above only it cost $32. Add the hour and a half labor and I was out the door for $152 total. Note the labor rate at $80 hour. I had taken it to the Spartan Chassis place and was quoted labor on a motorhome at $145 hr. Decided to pass on that.
TexasTruckAC.com is located in Dallas suburb of Balch Springs and the best I have found for automotive ac in 40+ years of owning a motorhome. Easy in/out with lots of room for BIGGEST of rigs. They really know their stuff!
Planocat
__________________
2004 Dutch Star 3809
Spartan Chassis
370 Cummins 6c8.3
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