Hi could any 1 help me as i dnt no which way to turn! ive got an astra gsi mk3 with heating problems it doesnt work on any setting, ive just fitted a brand new heater control unit and a brand new heater resister and still no heatin.. on the resister there ar 4 terminals for the wires to attache 2 but i dnt no which wire goes to which any1 no???? any help would be great.