Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 12-24-2022, 02:21 PM   #1
Junior Member
 
Join Date: Oct 2022
Location: Salt Lake City, UT
Posts: 4
Dash Heating and A/C Controls Not working

I have a 2008 American Heritage. My first trip out, I am 3 days in and the heater/AC Fan Controls are not responding to inputs. They were working fine, and then just stopped. I have checked all the fuses I could fine, under the steps, in the bays etc... none of them were blown. The fan knob clicks as I move it from low to high, like normal. The heater/cool adjustment knob turns like it should, but since there is no air moving, not sure if it is doing anything.

Thanks for any advise/direction.
DalePal is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 12-24-2022, 03:43 PM   #2
Senior Member


 
Winnebago Owners Club
Freightliner Owners Club
Retired Fire Service RVer's
Join Date: Mar 2014
Location: SO CAL
Posts: 242
Do you hear the blower running? If you hear the blower but no air moves, I would check for a vacuum line problem. The vents are controlled by vacuum operated louvers. Without vacuum - no air movement.
__________________
2007 Itasca Meridian 39K
350 HP Cat / Allison 6 Speed
1 Wife and 2 Dogs
960 watts of solar, 440 Amp hours AGM batteries
KCFDCapt is offline   Reply With Quote
Old 12-24-2022, 05:46 PM   #3
Senior Member
 
153stars's Avatar
 
Join Date: Mar 2019
Location: Braidwood Il.
Posts: 6,912
Usually if you lose blower resistor pack you still have high. If loss of controls for dampers ,default is to defrost for safety. Have you actually located "the" blower fuse. Not unheard of to a lose blower motor but they tend to lock up and squeal a bit first , "not a rule though".Most heater controls are adopted from auto/truck parts. I suppose the fan dial could fail, it would be my last bet. Always suspect grounds.
__________________
95 Monaco Crown Royale
M11 400hp, 4060 trans.
Aquahot, Generac Guardian7.5k
153stars is offline   Reply With Quote
Old 12-26-2022, 03:07 PM   #4
Senior Member
 
Ray,IN's Avatar
 
Join Date: Aug 2001
Location: North America somewhere
Posts: 28,011
Firs things first. Have you determined if 12V is present at the the control panel?
__________________
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA." My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
Ray,IN is online now   Reply With Quote
Old 12-26-2022, 06:54 PM   #5
Senior Member
 
Rob_M's Avatar
 
Join Date: Dec 2019
Location: Canyon Lake, Texas
Posts: 2,470
Quote:
Originally Posted by KCFDCapt View Post
Do you hear the blower running? If you hear the blower but no air moves, I would check for a vacuum line problem. The vents are controlled by vacuum operated louvers. Without vacuum - no air movement.

Diesel pushers do not have vacuum.
__________________
2002 American Tradition 40'
Cummins 8.3, Banks 431hp, 1260 tq
Canyon Lake, TX
Rob_M is online now   Reply With Quote
Old 12-26-2022, 10:41 PM   #6
Senior Member
 
Jon_C's Avatar
 
Join Date: Jul 2018
Location: Southeast Texas
Posts: 1,055
Quote:
Originally Posted by Rob_M View Post
Diesel pushers do not have vacuum.


Some like mine have a small vacuum pump for the a/c controls up front.
__________________
1998 HR Endeavor Cummins ISB 275 / Banks Allison 3060
20014Jeep Wrangler JKUR with M&G air brake with breakaway
Jon_C is online now   Reply With Quote
Old 12-27-2022, 12:53 AM   #7
Senior Member
 
RealNiceTent's Avatar
 
Join Date: Jul 2021
Location: Northern Nevada
Posts: 450
Originally Posted by Rob_M
Diesel pushers do not have vacuum.



Quote:
Originally Posted by Jon_C View Post
Some like mine have a small vacuum pump for the a/c controls up front.



There are a lot of diesel vehicles including medium duty trucks, cars, motor-homes, and step vans that use electric or engine driven vacuum pumps to supply vacuum for brake boosters, emission control systems, climate control and accessories. Cummins "B" engines are frequently fitted with a vacuum pump run off the drive on the back of the timing case. Newer vehicles are less dependent on vacuum for control systems. Digital stepping motors have pretty much taken over those duties.
__________________
Dave & Kandi & Indica the Chorkie pup "Big Blue"
2001 Holiday Rambler Admiral 30D w/ 2nd slide
2000 P32 7.4 4L80E wide track J71 18/21K
RealNiceTent is offline   Reply With Quote
Old 12-27-2022, 05:16 AM   #8
Senior Member
 
Join Date: Aug 2019
Location: Eastern outskirts of Dallas, TX
Posts: 2,757
Quite often the blower speed switch gets burned up due to the poor design of the switch and the high current the blower motors pull.

Noting you say you are not feeling any air moving tends to indicate to me that you may have this problem - we do on our ‘02 coach, and I’m in the process of replacing the switch and adding relays that will handle the motor current while the switch will only handle the relay coil current (I plan to document the process to IRV2, hopefully finishing today).
__________________
Ď91 Ultrastar ChampionĎ02 Georgie Boy Landau 8.1l Workhorse
Ď03 Jeep Wrangler TJ 2018 Jeep Wrangler JK toad
MrMark52 is offline   Reply With Quote
Old 12-27-2022, 06:19 AM   #9
Senior Member
 
153stars's Avatar
 
Join Date: Mar 2019
Location: Braidwood Il.
Posts: 6,912
Can also "like mine" use a vacuum inducer. They use air pressure , just a small flow from the air compressor to make vacuum
.
Quote:
Originally Posted by Jon_C View Post
Some like mine have a small vacuum pump for the a/c controls up front.
__________________
95 Monaco Crown Royale
M11 400hp, 4060 trans.
Aquahot, Generac Guardian7.5k
153stars is offline   Reply With Quote
Old 12-27-2022, 06:36 AM   #10
Senior Member
 
Rob_M's Avatar
 
Join Date: Dec 2019
Location: Canyon Lake, Texas
Posts: 2,470
Quote:
Originally Posted by RealNiceTent View Post
Originally Posted by Rob_M
Diesel pushers do not have vacuum.








There are a lot of diesel vehicles including medium duty trucks, cars, motor-homes, and step vans that use electric or engine driven vacuum pumps to supply vacuum for brake boosters, emission control systems, climate control and accessories. Cummins "B" engines are frequently fitted with a vacuum pump run off the drive on the back of the timing case. Newer vehicles are less dependent on vacuum for control systems. Digital stepping motors have pretty much taken over those duties.

I was aware that many diesel vehicles have vacuum pumps. Didnít realize some DPís did also. My American Coach on Spartan does not. (that Iím aware of). Appreciate the correction.
__________________
2002 American Tradition 40'
Cummins 8.3, Banks 431hp, 1260 tq
Canyon Lake, TX
Rob_M is online now   Reply With Quote
Old 12-28-2022, 07:49 PM   #11
Junior Member
 
Join Date: Oct 2022
Location: Salt Lake City, UT
Posts: 4
Thanks for all the information

Thanks to everyone, looks like I need to add a little more information.

First, I turn the fan knob and absolutely nothing happens, My first guess is a fuse. I looked everywhere and have not located a blown fuse. I may be missing a fuse block. I found these fuse blocks: 1. Under the stairs, 2. In the bay on the passenger side mid way down. It has a cover that you have to turn a knob in the middle and the cover comes off. There were two different fuse blocks like this. 3. In the last bay on the passenger side, alongside the motor.

The motor is a Cummins 10.8L 500HP if that helps.

I could have a burnt out switch, since it was working fine, and just stopped. I have limited access while on the road. Will be back home January 10th (about 2 weeks from now) and will have more ability to diag.

My gut tells me I am missing a fuse block, or missed the blown fuse...
DalePal is offline   Reply With Quote
Old 12-29-2022, 08:13 PM   #12
Senior Member
 
Join Date: Jul 2018
Location: Oklahoma
Posts: 237
We have an 09 Tradition, the duct dampers are driven by small servo motors. In the front drivers side compartment (under the driver) is the ac lines, dryer, heater core, etc. look for an inline fuse close to the blower motor. I dont know if thats your fix, but look at it.
__________________
Questios, questions, questions. Yeah, Iím that guy. But, Iím learnin!
2009 American Tradition 42P. ISL Cummins 425hp, Spartan chassis w/ tag, Allison trans,
Jandcinok is offline   Reply With Quote
Reply

Tags
dash, heat, heating



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Silverleaf controls and heating resullivan Newmar Owner's Forum 7 09-15-2014 05:45 PM
Dash a/c controls not working properly safari1999 Class A Motorhome Discussions 13 05-05-2014 02:21 AM
Atwood air conditioning and heating controls Ian2604 RV Systems & Appliances 8 02-21-2013 04:23 PM
Dash heater and A/C controls, not operating correctly JohnnyJ Winnebago Industries Owner's Forum 20 01-14-2013 08:41 PM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 07:07 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2023, vBulletin Solutions, Inc.