Vents underneath bed 2004 Winnebago Sightseer

[Pklamb]

I recently purchased a 2004 Winnebago Sightseer. Yesterday hot air started pouring out of vents underneath the bed. It is coming from hoses leading to a silver metal box. What is this unit and how do i turn It off?

[tderonne]

It's the rear heater.

From your Owner's Manual:

REAR AUTO HEATER
To provide auxiliary heat to the rear of the vehicle, turn the rear heater fan switch to the desired speed.