Sounds like the engine is turning over from the weight of the car pulling it downhill. I used to have a 205 with a 954 cc engine and a crap handbrake and if i left it in 3rd with the handbrake on you could still push it around! If you're pointing downhill nose first leave it in reverse. And try 1st for uphill.
New blower motor is needed chief.. it's just 3 (or 4) screws that hold it in place. The blower motor unit is the thing that the resistor pack sits in. Just disconnect the wires, unscrew the motor and bobs your uncle