13 4 HEATEH AHD IIEFHUSTEH VI www SEE SEQIEETLQJSSCT Gliarnkaa Wagnnnar Trunk The ventilating system has two fresh air vents one SCREMG 1 in the right cowl trim panel and one in the left cowl trim panel fig 13 6 Both vents are cable controlled L3 G E with the control knobs mounted on the instrument wasnza LA panel to the right and left of the steering column x 6c f i 2 E L m x 4 x z K Q Q E FAH IIDHTROL SWITCH No ca mma 4 CLAMP STRAP gsi Hmm DNTROL SCREW 1 Rotate knob until slot in neck of knob is visible Insert a small bladed screwdriver in the slot 2 25 and depress spring metal clip toward knob This will relieve tension on the spring metal clip and allow knob Flu I3 5 Fnsh Alr Im k CJ Modal to slide off shaft fig 13 7 Sorvlca Dlaqnnsls Condition Possible Cause Correction FAN MOTOR 1 Blovm fuse 1 Replace fuse WILL NOT RUN 2 Loose connection 2 Inspect and tighten AT ANY SPEED 3 Poor ground 3 Clean and tighten 4 Faulty switch 4 Replace switch 5 Faulty motor 5 Replace motor 6 Faulty resistor 6 Replace resistor FAN MOTOR RUNS 1 Faulty switch 1 Replace switch AT ONE SPEED ONLY 2 Faulty resistor 2 Replace resistor FAN RUNS BUT DOES 1 Intake blocked 1 Clean intake NOT CIRCULATE AIR 2 Fan not secured to 2 Tighten securely t haft 3 Ii iletggldor not opening 3 Replace defective vacuum Cherokee Wagoneer Truck motor switch or hose HEATER WILL NOT HEAT 1 Coolant does not reach 1 Check and replace proper temperature thermostat if necessary 2 Heater core blocked 2 Flush or replace intemally core if necessary 3 Heater core ajr bound 3 Purge air from core 4 Blend a ir door not in 4 Adjust cable proper position w LL NOT DEFROST 1 Vacuum motor not 1 Check for engine operating Cke Wag Trk vacuum at vacuum motor 2 Vacuum control switch 2 Check for engine vacuum inoperative Cke Wag Trk at switch 3 Control cablc adjustment 3 Adjust control cable incorrect CJ Models 4 Defroster hose damaged 4 Replace defroster hose