Despite the blower working on my new to me Imp it didn't blow any hot air. Upon further inspection it appears someone disconnected the input/output hoses from the heater core and just put an elbow in between them to complete the circuit. I am guessing the heater core must leak, how common of a problem is this? What would be the best way to test this? How hard is it to remove the blower and heater core assembly? If the core does leak could a rad shop repair it? Or does anyone know of a replacement part? Thanks.