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Old 08-18-2020, 11:06 PM   #1
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Brand: Thor Motor Coach
Model: ACE
State: California
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THOR #19443
Waste venting

I have a Thor 2014 ACE 29.2 with a constant black tank oder. I am looking for the black tank roof vent. I have found one vent on the roof but not two. Are both black and grey vented through one vent on this model?

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Old 08-18-2020, 11:24 PM   #2
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Brand: Thor Motor Coach
Model: Axis 24.4
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THOR #1150
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Originally Posted by DustyD View Post
I have a Thor 2014 ACE 29.2 with a constant black tank oder. I am looking for the black tank roof vent. I have found one vent on the roof but not two. Are both black and grey vented through one vent on this model?
They could be. They are on our Axis.

You may also want to investigate the air admittance valve (AAV) in the cabinet with the bathroom sink (typically the bathroom sink also drains into the black tank). Sometimes the AAV's go bad--they are supposed to let air into the system but not out. I recently had to replace them on ours (our coach also had one with the kitchen sink into the grey system). Fortunately I found the ones available at the Home Depot were screw in replacements.
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Old 08-18-2020, 11:25 PM   #3
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Originally Posted by DustyD View Post
I have a Thor 2014 ACE 29.2 with a constant black tank oder. I am looking for the black tank roof vent. I have found one vent on the roof but not two. Are both black and grey vented through one vent on this model?
The kitchen sink & the bath lavatory may be vented under their respective cabinets with an air emitance valve rather than through the roof. It's possible that's where your odor is coming from, easily replaced. Quite often the kitchen waste smells as bad, or worse, than the black.

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Old 08-19-2020, 12:00 AM   #4
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THOR #19443
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Originally Posted by JamieGeek View Post
They could be. They are on our Axis.

You may also want to investigate the air admittance valve (AAV) in the cabinet with the bathroom sink (typically the bathroom sink also drains into the black tank). Sometimes the AAV's go bad--they are supposed to let air into the system but not out. I recently had to replace them on ours (our coach also had one with the kitchen sink into the grey system). Fortunately I found the ones available at the Home Depot were screw in replacements.
Thank you.. good suggestions
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Old 08-19-2020, 12:01 AM   #5
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THOR #19443
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Originally Posted by Travelin' Texans View Post
The kitchen sink & the bath lavatory may be vented under their respective cabinets with an air emitance valve rather than through the roof. It's possible that's where your odor is coming from, easily replaced. Quite often the kitchen waste smells as bad, or worse, than the black.

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I will definitely check them.. thank you
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