[trooperbc]

well, you do have a coolant circulation problem, and that could be a number of things.
first, don't go by the reservoir. undo the radiator cap, with a rag and smarts if it's hot, and check the coolant there. it's possible that the system is way low on fluid, and you are not getting enough circulation to the heater core, and/or you have an air bubble in there blocking things
how's the temp gauge?
do this first thing. you do not want to be driving your new baby around without enough coolant.
if the engine is hot/warm, add coolant with the engine running. add to full, goose the throttle some, run until you are sure the thermostat is open and refill as needed. put cap back on.

report back. there are a number of other possibilities, but that is the first step.

some other possibilities
clogged heater core
heater bypassed by previous owner/seller because heater core leaked
water pump defective
clogged radiator
and others (?)

hth

//bc