AC making thumping noise

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Joined
Nov 3, 2019
Messages
395
Location
TGO Titusville FL
RV Year
2015
RV Make
Newmar
RV Model
Dutchstar 4369
RV Length
43
TOW/TOAD
2014 Honda CRV
We just arrived in Las Vegas and after setting up in 100F turned on two of the 3 AC’s. Soon after , #1 (forward) AC started making thumping noise.
It was still making cold air, but the noise was no good, so I turned it off.
I’m suspecting the blower or the fan? Trouble is that I don’t have a ladder to get on the roof. Will try to figure it out tomorrow.
It never ends.......
 
Joined
Nov 13, 2019
Messages
161
Location
Where ever I park it
RV Year
2017
RV Make
Salem
RV Model
Hemisphere 346RK
RV Length
38'
Did the noise start as soon as you turned the unit on? Then I would look at the fan and blower wheel to see if there is something causing an imbalance. Otherwise I am at a loss as to why it would thump, unless for some reason the drain is holding a little bit of water and then the blower forces an air bubble out once in a while. Maybe the campground or a fellow camper has a ladder you can borrow?
 
Joined
Nov 14, 2019
Messages
645
Location
Orinda, CA
RV Year
2017
RV Make
Newmar
RV Model
Ventana 4002
RV Length
40’10
TOW/TOAD
2015 Jeep Trailhawk
@Buly I can attest to the work that NIRVC does on Newmars in case you are not able to resolve yourself. They might be able to squeeze you in if needed. You can ask for Jonathan Fisher and tell him I sent you.
 
Joined
Nov 3, 2019
Messages
395
Location
TGO Titusville FL
RV Year
2015
RV Make
Newmar
RV Model
Dutchstar 4369
RV Length
43
TOW/TOAD
2014 Honda CRV
Did the noise start as soon as you turned the unit on? Then I would look at the fan and blower wheel to see if there is something causing an imbalance. Otherwise I am at a loss as to why it would thump, unless for some reason the drain is holding a little bit of water and then the blower forces an air bubble out once in a while. Maybe the campground or a fellow camper has a ladder you can borrow?
It started after about two hours of working fine.
Few days ago it was doing it on and off, but not very loud
 
Joined
Nov 3, 2019
Messages
395
Location
TGO Titusville FL
RV Year
2015
RV Make
Newmar
RV Model
Dutchstar 4369
RV Length
43
TOW/TOAD
2014 Honda CRV
Thank you Sheridan. We called and left a message for him. Mentioned your name too. Have not heard back anything yet.
 
Joined
Jul 27, 2019
Messages
3,355
Location
Midlothian, VA
RV Year
2017
RV Make
Newmar
RV Model
Ventana 4037
RV Length
40' 10"
TOW/TOAD
2017 Chevy Colorado
I would get on the roof and pop the cover off and see what you can visually first. Then consider taking it in for service.
 
Joined
Jul 29, 2020
Messages
270
Not a good time of year in LV to call on an A/C man. If the compressor is overheating and kicking the thermal switch, It may need replacement or a charge. An IR thermometer may tell you a lot.
 
Joined
Nov 3, 2019
Messages
395
Location
TGO Titusville FL
RV Year
2015
RV Make
Newmar
RV Model
Dutchstar 4369
RV Length
43
TOW/TOAD
2014 Honda CRV
We just heard from J. Fisher NIRVC. He told us that most likely it I’d the blower motor, as I suspected. But he said that the lead time for parts is 8 weeks 😱. Looks like they come on the “ Slow boat from China”?
Most likely we will make do on the other two AC’s and I will do it when we get back to FL.
Hope another one does not bite the dust....
 
Joined
Nov 13, 2019
Messages
161
Location
Where ever I park it
RV Year
2017
RV Make
Salem
RV Model
Hemisphere 346RK
RV Length
38'
If you can get on the roof you can get the model number off the motor and order the motor and run capacitor from Amazon. I did that and it was a simple changeout. Had the parts in about a week also.
 
Joined
Nov 3, 2019
Messages
395
Location
TGO Titusville FL
RV Year
2015
RV Make
Newmar
RV Model
Dutchstar 4369
RV Length
43
TOW/TOAD
2014 Honda CRV
If you can get on the roof you can get the model number off the motor and order the motor and run capacitor from Amazon. I did that and it was a simple changeout. Had the parts in about a week also.
Thank you Gronk. Funny thing is at the same moment you posted I opened eBay app and there are many Dometic parts.
I will see if I can borrow a ladder, or jus buy one at Home Depor?
 
Joined
Nov 2, 2019
Messages
2,112
Location
WA, MT or somewhere else!
RV Year
2018
RV Make
Newmar
RV Model
Mountain Aire 4047
RV Length
40'
TOW/TOAD
2014 Honda CR-V
I will see if I can borrow a ladder, or just buy one...
Be careful! Ladders are the enemy of people over the age of 50. :ROFLMAO:

TJ
 
Joined
Nov 3, 2019
Messages
395
Location
TGO Titusville FL
RV Year
2015
RV Make
Newmar
RV Model
Dutchstar 4369
RV Length
43
TOW/TOAD
2014 Honda CRV
Joined
Jul 27, 2019
Messages
3,355
Location
Midlothian, VA
RV Year
2017
RV Make
Newmar
RV Model
Ventana 4037
RV Length
40' 10"
TOW/TOAD
2017 Chevy Colorado
Joined
Nov 3, 2019
Messages
395
Location
TGO Titusville FL
RV Year
2015
RV Make
Newmar
RV Model
Dutchstar 4369
RV Length
43
TOW/TOAD
2014 Honda CRV
Hi Neal. My question is: When you prop the ladder to the side of the coach, does it stick a little above? It helps when you are trying to get down.
 
Joined
Jul 27, 2019
Messages
3,355
Location
Midlothian, VA
RV Year
2017
RV Make
Newmar
RV Model
Ventana 4037
RV Length
40' 10"
TOW/TOAD
2017 Chevy Colorado
Hi Neal. My question is: When you prop the ladder to the side of the coach, does it stick a little above? It helps when you are trying to get down.
I don't recall it not being tall enough or a concern. Specs say it's 12.5' long. Add "noodles" to the area that touches your coach. I used it to get to the top of my windshield to install @J&JD's gutter mod. I did not use it to get on the roof as I have a ladder on the back of mine for that. Maybe others can chime in as this seems to the popular one among the Newmar community.
 
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