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07-08-2013, 08:52 PM
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#1
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Member
Join Date: Apr 2011
Posts: 41
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Dash A/C control problem
Suddenly, my dashboard A/C control is partially inoperable. It turns the A/C on and cool air comes out in the overall dash area, but I can not select the vents for the flow. If I set it on the dash vents blowing toward the passengers, nothing happens. Are these controls electric or vacuum operated? It does shut the A/C on and off. The RV is a 2003 Holiday Rambler Neptune.
Thanks for your help.
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George & Beezer,The pups: Annie, Bella & Charlie
2003 HR Neptune, Cummins 300hp, Jeep Liberty
"So many campgrounds...so little time!" 
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07-09-2013, 05:17 AM
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#2
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Senior Member
Monaco Owners Club Texas Boomers Club
Join Date: Jan 2009
Posts: 2,529
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Should be vacuum.. The "failed vent position" is to the windshield/defrost ..
The OFF/ON is electric...
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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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07-09-2013, 06:29 AM
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#3
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Senior Member
Join Date: Nov 2007
Location: South of Nashville, TN
Posts: 331
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Like Hal said, you probably have lost your vacuum source. Either your vacuum generator stopped (could be electric driven or air driven) or a vacuum hose came off. There is also a chance that some of the vent linkage is not functioning but that is a less common failure.
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Les Stallings
2006 Monaco Signature -45' Castle IV
All-Electric, Cummins ISX-600
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07-09-2013, 06:38 AM
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#4
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Senior Member
Holiday Rambler Owners Club
Join Date: Feb 2013
Location: Green Cove Springs Fl
Posts: 220
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What engine do you have? If it's the Ford V10 I might be able to help
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07-09-2013, 06:46 AM
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#5
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Senior Member
Winnebago Owners Club
Join Date: Jun 2011
Location: Amite, La.
Posts: 289
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Could be mixing door for vents sticking or vacuum leak.
Check pump while engine is running make sure it is holding at least -18 vacuum , test with vacuum gauge , some have a check valve down stream from pump test it also , check accumulator also.
If vacuum is OK check mixing doors behind dash .
Hope this helps,
James
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07-09-2013, 08:29 AM
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#6
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Member
Join Date: Apr 2011
Posts: 41
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Many thanks guys. Next stupid query: where is the vacuum pump? I have a Cummins 300 ISB. Is it in the dash area or connected from engine to dash via hose? If it is the engine, located where.
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George & Beezer,The pups: Annie, Bella & Charlie
2003 HR Neptune, Cummins 300hp, Jeep Liberty
"So many campgrounds...so little time!"
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07-09-2013, 09:22 AM
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#7
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Senior Member
Join Date: Aug 2011
Posts: 1,126
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mine is located on the front firewall above the genny
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96 Dynasty 36' that does NOT wander, thanks to RuppParts.com and their superior "poly" suspension bushings
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07-09-2013, 09:31 AM
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#8
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,486
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12volt , vacuum pump , about the size of a pop can , near the heater hoses on the outside of the fire wall, electric, and of course vacuum hose connected, has a separate fuse ; from the blower motor in my coach. Check all the fuses.
NAPA/AutoZone have them , if yours is dead.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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07-09-2013, 03:32 PM
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#9
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Member
Join Date: Apr 2011
Posts: 41
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Thanks guys. I luv this forum!
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George & Beezer,The pups: Annie, Bella & Charlie
2003 HR Neptune, Cummins 300hp, Jeep Liberty
"So many campgrounds...so little time!"
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07-10-2013, 12:32 AM
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#10
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,486
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George , we appreciate the thanks , but have you got things fixed ?
Pump? Fuse? 
Inquiring minds need to know.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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07-11-2013, 07:36 AM
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#11
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Member
Join Date: Apr 2011
Posts: 41
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Haven't been able to get to RV until tonight. Will post results ASAP.
Thanks.
__________________
George & Beezer,The pups: Annie, Bella & Charlie
2003 HR Neptune, Cummins 300hp, Jeep Liberty
"So many campgrounds...so little time!"
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07-11-2013, 01:18 PM
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#12
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Senior Member
Damon Owners Club Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 24,024
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I have seen two different failures, one had multiple causes.
One is the system goes into "Default" which in this case is spelled "Defrost" since that is the single Most IMPORTANT function. This was caused by one of the following.
Intermetent (Acceleration only) Due to a bad cruise controle slave solenoid, Leaking air, causing a loss of vacuum.
Broken or disconnected vacuum line
And in one case: A broken vacuum motor mount. (Duct tape to the rescue,,,well Gorilla tape).
Loss of a linkage or a vacuum motor can cause this to happen as well. Or something jam the motor.
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Home is where I park it!
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