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Old 05-24-2023, 10:16 PM   #1
Devoir's Avatar
Join Date: Aug 2022
Location: DFW
Posts: 76
Heat & Smell escaping thru Vent in Closet while traveling

We have a 2018 Tiffin Allegro Bus 45MP.

We've noticed two things while driving down the highway Heat and Smell.

First Heat : The back of the bus get 88 to 95 after about an hour and the outside temp has been 55ish. during the last trip while the WAF drove and I crawled over the bed to check out the rear of the bus I discovered the vent just below the washer/dryer which covers the furnace heat exchanger was pouring out hot air as if the the fan was on. On the next trip I blocked the vent in the closet and the vent under the mirror this made a huge difference in the temperate at the end of a 6 hour drive. We no longer have to run the generator to cool the bus while traveling.

Question 1: is there a valve to turn off the heat loop? While traveling the engine is heating the water which runs thru the furnace heat exchanger. I think this is the source of the heat vs engine radiating heat thru the floor.

Question 2: Does anyone have a photo of the space under the washer/dryer where the furnace heat exchanger sits? I believe while traveling the cavity holding the heat exchanger is getting pressurized venting air into the closet. I want to see how or where to seal this cavity.


Second Smell : I believe the Engine Regenerates when we climb mountains I monitor the exhaust temp thru the BlueFire app to keep it out of Red line temp. when the temp hits 980-1100'F we begin to smell burnt odor . I believe the fumes are being pulled into the cavity where the heat exchanger sits , then is pushed fumes inside the coach . For now we are blocking the vents while we travel. I also noted when we smell the odor we don't get a CO alarm to go off.

Question 3 has anyone experienced this issue with the vents in their bus?
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2018 Alegro Bus 45MP
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Old 05-25-2023, 11:56 PM   #2
Devoir's Avatar
Join Date: Aug 2022
Location: DFW
Posts: 76
Drove from Santa Fe to Woodland Park today. I blocked the vents and confirmed it reduced the temperature in the back of the bus.

We climbed mountains all day and didn't get the burnt odor.

I'm hoping someone has a photo of the area under the washer/dryer. I want to see what are is not sealed to outside space below the coach. This is pressurizing the cavity pushing hot air into the coach.

Many thanks
2018 Alegro Bus 45MP
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heat, smell, travel, vent

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