I have temporary custody of an 87 Ford/Carpenter School Bus converted to tailgating machine for our HS Football Boosters. When driving I've noticed the left side puts off quite a bit of heat. Seems to be coming from below the panel with switches for lights, etc. Is this normal? Looked for a switch to see if heater was turned on, but so far haven't found it. There is a pull toggle on that panel that says "power vent" but not sure what it does if anything. Sorry for the simple question, but quickly losing hair on my left leg