Newbie heater question

[Sovereign86]

I recently bought a 1986 31' Sovereign. I have been camping a few times. Of course I have given the A/C a good workout, but just recently noticed that there appears to be no heater! Other than a heat setting on the Coleman roof A/C, there is nothing that I can find. The owner's manual briefly refers to an "optional" furnace. I find it hard to believe a 31' Airstream would not have a heater. . ?????

[Silverhobby]

Hi Sovereign 86,
Look for a door or panel on the inside of the coach with a screen or wire mesh "type" panel in it. It will be for the cool air return to the furnace. The Airstream "should" have a furnace installed in it unless a PO (previous owner) removed it.