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Old 05-25-2019, 10:35 PM   #1
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Brand: Thor Motor Coach
Model: Aria 3901
State: Idaho
Posts: 343
THOR #9660
Aria dash air not working

Our dash AC is inop. The compressor does not start, no power to low pressure switch. Gauges show good pressure, so I believe it has to be electrical. Cannot find fuse or relay or dash wiring diagram to I can trace power at/from switch. Any Ideas?
Mike
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Old 05-26-2019, 02:58 PM   #2
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Brand: Thor Motor Coach
Model: 2013 ACE 30.1
State: Alberta
Posts: 946
THOR #2631
So I am not an AC expert by any stretch and I don’t know your Diesel coach systems either, but sometimes dated information for various RV systems stays “relatively similar” over the years.....or at least can provide some basic clues to what your dash AC controls “might also” do.
The compressor clutch control pressure switch monitors both for high and low pressure conditions I believe.....so if you are in the normal range for your system pressure that is good. You say there is no voltage on the wire from the dash controls calling for the AC clutch to operate.......so I wonder if there is some other safety device like an ambient air temp sensor in series with the pressure sensor to prevent the clutch from operating with too low a temp outside. Since it is certainly warm enough outside now, perhaps the temp sensor (if equipped) has failed open? The other source of the clutch control voltage should be the dash AC/temp controls I would think; and of course fusing of some kind. I don’t know the fusing for your coach so I don’t know if there is one fuse for the clutch or not. If the blower motor works then maybe checking for voltage on the AC; MAX AC control switch on the dash would be a next step?
I am attaching a link to an “old” 2005 Winnabago RV dash AC/Heater control document that could be totally useless......however it may give a few clues to help move the yard sticks down the field for your trouble. If my link works, scroll down a bit to the rotary dash control schematic (this shows both electric and vacuum controls). I noted on the older push button dash controls section, that they show a temp sensor in series with the pressure switch. I hope there is some helpful info that can be applied to resolving your problem. When we don’t have current schematics for our coaches we have to be detectives sometimes.


https://winnebagoind.com/resources/s...g%20&%20AC.pdf


Good luck.
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Old 05-26-2019, 03:12 PM   #3
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Brand: Thor Motor Coach
Model: Aria 3901
State: Idaho
Posts: 343
THOR #9660
Javelin,
Thanks. Those drawings for the rotary control and wiring are exactly what I need, just for our Thor. The control box is sealed, and I can't tell what wires are for what. Hoping to get diagrams from Thor after the holiday.
Mike
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Old 06-20-2019, 06:11 AM   #4
LDK
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Brand: Thor Motor Coach
Model: Aria 3901
State: Colorado
Posts: 56
THOR #13190
Quote:
Originally Posted by m1noel View Post
Our dash AC is inop. The compressor does not start, no power to low pressure switch. Gauges show good pressure, so I believe it has to be electrical. Cannot find fuse or relay or dash wiring diagram to I can trace power at/from switch. Any Ideas?
Mike
Hi Mike. My front dash AC is not working either. Any findings that may be helpful?
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Old 06-20-2019, 02:32 PM   #5
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Brand: Thor Motor Coach
Model: Aria 3901
State: Idaho
Posts: 343
THOR #9660
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Originally Posted by LDK View Post
Hi Mike. My front dash AC is not working either. Any findings that may be helpful?
Not yet. Taking it to freightliner for a recall in the next week or two. Going to see what they find.
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Old 06-20-2019, 04:03 PM   #6
LDK
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Brand: Thor Motor Coach
Model: Aria 3901
State: Colorado
Posts: 56
THOR #13190
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Originally Posted by m1noel View Post
Not yet. Taking it to freightliner for a recall in the next week or two. Going to see what they find.
Thanks Mike. Taking it in related to the recall discussed in this post?
https://www.irv2.com/forums/showthread.php?t=413740

My chassis is included in the recall and need to get it to Freightliner.

I see dash AC mentioned in the post.

I also have right tear tailights out (signal, brake, etc). Not sure yet if related to the recall.
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Old 06-20-2019, 05:06 PM   #7
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Brand: Thor Motor Coach
Model: Aria 3901
State: Idaho
Posts: 343
THOR #9660
Yes, that is the recall. I had not seen the post about the A.C. Thanks for posting that for me.
Mike
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Old 07-13-2019, 04:19 AM   #8
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Brand: Thor Motor Coach
Model: Aria 3901
State: Idaho
Posts: 343
THOR #9660
Got it in to Freightliner , yes the recalled PDM was bad, but was not the problem with the AC. AC compressor clutch was bad, they ordered that, and when they went to install the new clutch, damaged the compressor. Compressor is on national back order, so don't know when we will get one. Good news is all covered under Freightliner warranty, and running the roof air with generator and using the dash vents on recirculate cools very well.
Mike
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Old 07-25-2019, 09:37 PM   #9
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Brand: Thor Motor Coach
Model: Aria 3601
State: North Carolina
Posts: 21
THOR #5972
I just took my 2019 Thor Aria to Freightliner for the turn signal brake light recall. Our dash air has quit working also. On our way back from camping last week, we heard a loud pop, that actually sounded like a tire blowing out and the dash air is now blowing hot air. When we arrived at the Freightliner dealership, a mechanic came out and said "Oh, that dash air not working could be tied into the PDM that is under recall." My husband said, "Yeah, I guess that loud noise we heard was the PDM exploding and I guess it smells like freon also." I hope that is not the idiot that is going to be working on our coach. He also hinted at blaming it on a possible Thor problem. We told him it was our dash air and not the ac units on top of the motorhome.
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