Heat & Smell escaping thru Vent in Closet while traveling

[Devoir]

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.

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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?

[Devoir]

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