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Dash Air Problem - Questions

Yahoo Message Number: 102629
My Dash Air when set to A/C the Fan Speed set either the first or second setting works fine, but if I move the Fan Speed the the third setting the unit shuts off and then comes back on for a few seconds and shuts off.

Butch Williams tells me to change out the Resister Packs in the Air Blower as first step. I've found the Resister Packs and there on the way to me. I've got access to the passenger side Resister but the Driver side is a "bear cat" to get to, not sure what I'am going to do about it.

My question is have any of you had the problem and solved it by changing out the Resister Packs?

Thanks, Mike 2003 Allure 1st Ave. #30898

Re: Dash Air Problem - Questions

Reply #1 –
Yahoo Message Number: 102662
Hi Mike - I'll follow this thread with interest. And yeah, I should call and talk with Butch about our unit too...

No, I have no knowledge on if the resistor change over will help your problem.

Your problem is a bit different then ours.

Our driver side OTR AC and fan work as they should. Our passenger side came back from the shop from the last work, with a new problem. (And, the passenger side switch that controls temp and fan speed, may have been impacted, as the shop installed another switch in the same wood cabinet for a different item. It was apart, and who knows some wires came loose or if the switch was damaged somehow.) The four black AC vents on the passenger side, only have one that has air blowing out and responding to the fan passenger switch fan speed changes. The top right, as you are sitting in the passenger seat, works. the lower right, and the two vents towards the center of the coach, all have not AC or fan air flow coming thru them. I've poked around back behind and in the dash looking for loose wire connections, with no luck. I think I found the area that you're talking about where you will change out the resistors, over towards the center their seems to an air manifold, with wires and electronic components on it. When I pull the small wood cabinet out that is in the dash in front of the passenger, I can get good access to that, as well as the hydro hot register that is right below the cabinet.

I wish you luck, and will follow this thread. Suppose I'll need to call Butch and start the process with his guidance to diagnose what is wrong with our passenger side OTR. It has been hot a few times on this trip, and we're in Sioux Falls now, with temps in the low 90's - and the city is still drying out from the week ago 8" of rain in one hour!! So, quite a bit more humid then this guy likes:)! (Keep thinking and joking about he commercial that says 'It's like a saauunnnaaaaa (sauna) out their...' Heck, I've said 'It's like s steam room out their!':(!)

We usually run the generator and rear roof AC's when traveling. with the rear AC doing most of the work, to avoid the loud fan nice of the front AC, when traveling in hot weather. The front OTR does a good job on keeping us relatively cool when traveling, but we then find it takes longer then we like to cool down a coach that has had heat build up all day while traveling. With there rear AC doing 90% of the work for us, figure the full consumption of the generator vs OTR is about the same.

Best of luck to you!!!

Smitty

04 Allure 31017
04 Allure Sold to a nice new owner! Now enjoying a 07 Magna Rembrandt 45' ISX600 #6775
"We're ONDROAD for THEJRNY!" (Toad and Coach license plates, say Hi if you see us!)

Re: Dash Air Problem - Questions

Reply #2 –
Yahoo Message Number: 102664
I recently had my dash a/c serviced. They replaced a leaky hose, both leaky schrader valves and then vacuumated  the system and recharged. The outside temp was 77 degrees with a dew point of 74. The temp coming out of the vent got down to 50 degrees on the 3 mile ride home. I would like a few opinions  as to whether this is all the lower to expect, or should it be lower? Thanks in advance.

Brett

08 Allure 470
# 31665

Re: Dash Air Problem - Questions

Reply #3 –
Yahoo Message Number: 102667
I think that temp is pretty good!! In hose temps and humidity.

Smitty

04 Allure 31017
04 Allure Sold to a nice new owner! Now enjoying a 07 Magna Rembrandt 45' ISX600 #6775
"We're ONDROAD for THEJRNY!" (Toad and Coach license plates, say Hi if you see us!)

Re: Dash Air Problem - Questions

Reply #4 –
Yahoo Message Number: 102677
Smitty,

I got mine fixed yesterday with the installing the two (2) new Resister Packs. I drove home from the shop 60 miles, in 90 degree humid heat in fan position 3 and the unit never shut down.
So as Butch said it must have been the old Resisters were shorted out or the Thermal Fuse which is part of the Resister Pack was dead.

Thanks, Mike 03 Allure 1st Ave. #30898

Re: Dash Air Problem - Questions

Reply #5 –
Yahoo Message Number: 102683
Brett, if your coach has the Evans Tempcon A/C system, check out this guide to judging the performance of the system: http://www.evanstempcon.com/tsg_guidelines.phpIt looks like you should see a temp differential in humid conditions like you have  between outside air and what is coming out of your dash vents of 20-25 F.
On a recent trip in the low nineties we felt like our system was not performing well. We were a little warm, but based on these specs ours is normal. Not sure I believe it though, so I think I am going to have mine serviced.

In the old days we used to just check the pressures with a gauge and add a little refrigerant, but like you found out they now go by the system capacity, taking out what is in the system and replacing it with the specified amount. My problem is my tag in the engine compartment is gone and I am not sure how much the system holds. I have asked all my friends with a 33 ft Allure, and nobody knows.

George Harper
04 Allure 31093
Rome GA

I recently had my dash a/c serviced. They replaced a leaky hose, both leaky schrader valves and then vacuumated  the system and recharged. The outside temp was 77 degrees with a dew point of 74. The temp coming out of the vent got down to 50 degrees on the 3 mile ride home. I would like a few opinions  as to whether this is all the lower to expect, or should it be lower? Thanks in advance.

Brett

08 Allure 470
# 31665

Re: Dash Air Problem - Questions

Reply #6 –
Yahoo Message Number: 102684
Actually the temp spread is minimum of 20 degrees between the air leaving  the vents and the air entering the system. That is usually the interior temp.  Now on a dash air system it will be a blend of the inside temp and outside temp,  unless the recir  button is pushed to stop the outside air  from entering the inside air only.

Mikee

Re: Dash Air Problem - Questions

Reply #7 –
Yahoo Message Number: 102686
George,

My 2003 - 40' Allure w/Tag Axle shows on the Surge Tank 4.0 lbs of FREON. On my latest service I had them install a little more than the 4.0.

I believe the CC TECHS when the Tag can't be found uses the percentage of Coach Length. So you 33' coach would be 82.5% of 40' equating to 3.3 lbs of Freon.

Good Luck

Mike 03 Allure 1st Ave. 40' Tag

Re: Dash Air Problem - Questions

Reply #8 –
Yahoo Message Number: 102690
Mike

I was thinking about putting in 4.0 lbs. I had that written in my notes, but also in another place I had written 4.5 lbs. My problem is I don't make notes of where I got the info.

I did call Country Coach and they told me they had a chart that somebody made showing refrigerant amounts for different coaches. He told me only the amount of oil varies and not the amount of refrigerant regardless of coach length - go figure. He said it was 5 lbs. Evans Tempcon shows a lot of chassis, but not Country Coach. Looking at that 5 lbs. is likely too much..

George Harper
04 Allure 31093
Rome, GA

George,

My 2003 - 40' Allure w/Tag Axle shows on the Surge Tank 4.0 lbs of FREON.

Re: Dash Air Problem - Questions

Reply #9 –
Yahoo Message Number: 102692
Do not rely on that tag. Charge the system by the pressures and temps.  R-134 systems do a little better when slightly under charged.

Mikee

Re: Dash Air Problem - Questions

Reply #11 –
Yahoo Message Number: 102710
Thanks for all the info. I think I am right were it should be.

Re: Dash Air Problem - Questions

Reply #12 –
Yahoo Message Number: 102713
Don, these instructions are based on your coach having A/C and Heat control for the Passenger Side as well as the main control on your driver side. If you just have the Driver side reply back to mean as it's a lot tougher.
To locate the passenger side "Resister Pack" either take off the Dash Vertical Panel in front of the passenger knees/or if you have a wood cabinet there, remove it.
Stick your head into the opening and look to the left to find the "gray colored blower box" where all the "black coiled ducting is connected".
Look at the "lower vertical side towards front of coach" for the "black plate with a plug fitting into the spades you see below".
The Part Number is "Motorcraft" #D8BH-19A706-AB, price $28.50 ea. Phone 913-515-1560, PHOTO BELOW ask for Richard

Regards, MIKE 03 Allure 1st Ave. #30898

8

Re: Dash Air Problem - Questions

Reply #13 –
Yahoo Message Number: 102725
Don, I failed to tell you how to reach the "Resister Pack" for the Drivers Side, it's much tougher than the passenger side should you have the Dual System.

Here we go: Sitting in the Drivers Chair look down at your Brake and Fuel Pedals. Just to the Right of the Fuel Pedal should be a Carpeted Kick Board and to the immediate Front of the Brake & Fuel Pedals will be a Carpeted Kick Board. Those have to be removed to allow you to get to the Fan Blower Case which contains "Resister Pack" it's just located opposite from the Passenger Side.

Thanks, Mike 03 Allure 1st Ave. #30898