JLanzino

Hi Everyone was wondering if u could help me. I took apart my Fan on my car (60 Dart) and noticed i need a new blower motor. Now there was a cable from the dash to control the warmth or coolness that cable runs to a small square box above the heater with hoses going into it. Now there a wire that comes out of that box & goes into the Heater Housing the prob is i don't know where it goes and if that wire (Non Electrical with a Spring at the end of it) controls the heating mechanism for the fan ?