I think he means "lever" instead of "level' and yes, that is the rear heater
core off and on switch.

Maggie

>>      One more thing about underneath the back bench,
>> there is a level that states off and on.  I think this
>> may control the regulation of heat to that duct under
>> the seat?

>A "level" ?

>like a bubble level?

>May be there to see if van is level when parked. Van should be level
>when operating the Dometic fridge for more than a few hours. i.e. when
>parked for camping.