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07-14-2013, 04:48 PM
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#1
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Junior Member
Join Date: Jul 2013
Posts: 9
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ISB 300 Where do I add refrigerant to the Dash AC
My dash AC isnt blowing as cool of air as it used to. A friend of mine suggested i pick up a can of R134 and add it myself, my problem is where in the heck do i find the valve to screw the can to? I have looked under the bed and see the compressor and 2 rubber hoses leading to the front of the coach i assume... I cant see it near the condenser located in the front of my rig, any suggestions?
David
2003 Newmar Kountry Star 33
300 ISB Cummins
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07-14-2013, 04:56 PM
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#2
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Senior Member
Join Date: Sep 2012
Posts: 4,232
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Like any AC system, you shouldn't be low on refrigerant. It's not designed to leak out. Adding some can be temporary, but could also be wasted, as it may leak out quickly. Or you could have an issue such as compressor not even kicking on.
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07-14-2013, 05:20 PM
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#3
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Junior Member
Join Date: Jul 2013
Posts: 9
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Quote:
Originally Posted by jesilvas
Like any AC system, you shouldn't be low on refrigerant. It's not designed to leak out. Adding some can be temporary, but could also be wasted, as it may leak out quickly. Or you could have an issue such as compressor not even kicking on.
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Good Point...I stopped in at my local Freightliner dealer and asked them about it and they treated me like i had the plague when i told them i had a Class A DP i wanted them to take a look at. They tell me they charge and additional $20 per hour to work on coaches? I am not sure if this is normal or not. That makes the hourly rate $120 in Madison Wisconsin! Any idea what the hourly rate should be so i can sort of get a baseline?
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07-14-2013, 06:05 PM
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#4
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Senior Member
Join Date: Jul 2011
Location: Lexington NC
Posts: 1,952
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$120 an hour is definitely not a bargain but not unreasonable either to me. Local rv shop here in Charlotte nc gets $105 an hour and that's not even an engine shop. These techs just work on Rv parts, no chassis or engine parts.
Chad
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07-14-2013, 06:18 PM
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#5
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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 Kountrystar3
Good Point...I stopped in at my local Freightliner dealer and asked them about it and they treated me like i had the plague when i told them i had a Class A DP i wanted them to take a look at. They tell me they charge and additional $20 per hour to work on coaches? I am not sure if this is normal or not. That makes the hourly rate $120 in Madison Wisconsin! Any idea what the hourly rate should be so i can sort of get a baseline?
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Very common and, while high it's not totally out of line. Our air con takes 4.5#'s of refrigerant to fill when new but we have a 41' DSDP.
__________________
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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07-14-2013, 06:19 PM
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#6
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Senior Member
Monaco Owners Club Freightliner Owners Club Holiday Rambler Owners Club
Join Date: Jul 2009
Location: Spring Hill, Florida
Posts: 1,380
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Quote:
Originally Posted by Kountrystar3
My dash AC isnt blowing as cool of air as it used to. A friend of mine suggested i pick up a can of R134 and add it myself, my problem is where in the heck do i find the valve to screw the can to? I have looked under the bed and see the compressor and 2 rubber hoses leading to the front of the coach i assume... I cant see it near the condenser located in the front of my rig, any suggestions?
David
2003 Newmar Kountry Star 33
300 ISB Cummins
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My valves are right in front after I open the front to expose the generator. Very visible. Also make sure the fan is working on the condenser...common problem
__________________
98 Endeavor DP, ISB275
RX300, Falcon II hitch, BB Vantage Select
VMSpc, 2002 Grey Ford Powerstroke
TST 507 w/ 10 Sensors
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07-14-2013, 06:25 PM
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#7
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Senior Member
Tiffin Owners Club
Join Date: Sep 2012
Location: Ambler, PA
Posts: 2,853
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1st make sure that it does take 134a and not R22. As was mentioned previously the connections are at the upfront evaporator. While it is not uncommon for vehicles to lose refrigerant through the compressor drive seal, you should check all of the hose connections to make sure that they are all dry. Oil is a sure sign of a leak.
__________________
Larry & Cheryl Oscar, Louie, Ranger & Henry (our Springers)
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07-18-2013, 06:09 AM
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#8
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Senior Member
Monaco Owners Club Texas Boomers Club
Join Date: Jan 2009
Posts: 2,529
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Back to the original question, the a/c is installed by the MH manufacturer and location of the "fill valves" could best be provided by the Newmar section of this site rather than the Cummins Engine area.
__________________
Hal & Ginny Miller '04 Beaver Santiam PRT40
'04 Saturn Vue - US Gear Brake - Blue Ox tow
3"girls" (2 Irish Setters - 1 Retriever) - RIP Annie & Emily (12/26/2017)
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07-18-2013, 05:06 PM
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#9
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Junior Member
Join Date: Jul 2013
Posts: 9
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Thank you
Thanks to all... I found it.. i added a booster can and things are back to normal now. This is a great site....
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07-18-2013, 08:47 PM
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#10
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Member
Join Date: Jul 2011
Posts: 68
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The condensor fan relay was wired wrong on mine from the factory. I bought it when it was 10 years old. Funny how no-one found it.
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07-28-2013, 06:59 PM
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#11
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Senior Member
Join Date: Mar 2007
Location: Baton Rouge, La
Posts: 838
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As others have stated my connections are up front above the generator. My systems looses a small amount of Freon each year, I have used both electronic and soap to try and locate the leak unsuccessfully. Each spring I add Freon and it is good for a year.
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07-28-2013, 07:30 PM
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#12
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Senior Member
Tiffin Owners Club
Join Date: Sep 2012
Location: Ambler, PA
Posts: 2,853
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Bacharach makes a leak detector that can pick up leaks less than 10 ppm. It would certainly find yours. Unfortunately they cost over $3,000 so I doubt if any RV or automotive facility would have one. A large commercial refrigeration contractor should.
__________________
Larry & Cheryl Oscar, Louie, Ranger & Henry (our Springers)
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07-31-2013, 04:04 PM
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#13
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Senior Member
Join Date: May 2010
Location: N.E. Florida
Posts: 1,399
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Quote:
Originally Posted by Kountrystar3
Thanks to all... I found it.. i added a booster can and things are back to normal now. This is a great site....
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Can you post a picture?
Thanks!
Dave
1998 American Eagle 40EVS
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07-31-2013, 04:16 PM
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#14
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Senior Member
Join Date: Jan 2013
Location: Indianapolis,Indiana
Posts: 248
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[QUOTE=Darwin;1662042]As others have stated my connections are up front above the generator. My systems looses a small amount of Freon each year, I have used both electronic and soap to try and locate the leak unsuccessfully. Each spring I add Freon and it is good for a year.[/QU
A common place for refrigerant to leak (Freon is a Dupont trade name) is at the compressor clutch assembly. If you look directly above where the compressor is mounted and see a oil slick you have found your leak.
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John & Berenda
2014 Palazzo 33.2
KarKaddy SS / Chevy Cruze
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