problem with the heater
 

hey guys i was just wondering if anyone could help me with my heater problem. i just bought a 91 rs and the heat was broken. it seems the blower doesnt blow. today i was cleaning my windows and i accidently tapped the blower with my foot on the passenger side and all of sudden the heat and everything is working. so i go to fill up on gas and when i start the car the heat stops again. does anyone have any idea what it could be?

loose connection, siezed motor.