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Old 06-20-2020, 10:25 AM   #1
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Brand: Thor Motor Coach
Model: Axis 24.1
State: Maryland
Posts: 123
THOR #5251
Roof top Air conditioning

Sounds weird but here it goes ....
if I run the fan alone I get clean fresh air.
Once I turn the A/C on I get a very nasty musty smell.
The little cabin filters are clean.
What could it be? Dead stick bugs in AC unit? Mold in duct work ?
Iím lost as to what to do....
help please... Thanks, Jim

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Old 06-20-2020, 10:34 AM   #2
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Brand: Thor Motor Coach
Model: 2020 Magnitude SV34
State: Florida
Posts: 3,327
THOR #12751
You might need to clean your evaporator and / or check your drip pan. If the drain for the drip pan is plugged you might have some stagnant water building up.

Here is a decent A/C troubleshooting guide that may help....


https://www.etrailer.com/faq-how-to-...eshootRVAC-edu
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Old 06-20-2020, 11:29 AM   #3
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Thanks Judge, Iíll take a look as recommended.
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Old 06-20-2020, 12:55 PM   #4
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Brand: Thor Motor Coach
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Well, I checked everything out and it all looks good. So I cranked up the AC and wouldnít ya know it.....no musty smell.
The smell came when we were camping at a local campground. So I think something in the outside air... oh well... itís better now!
Got the generator running for its monthly exercise and running AC too. So far so good!
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Old 06-20-2020, 01:58 PM   #5
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Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 9,729
THOR #7035
Perfect thread!!

OP posts about a problem
Receives good responses relevant to his actual problem
OP follows the suggestions
OP promptly reports back on his troubleshooting and results
OP is satisfied his problem is resolved

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