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SERVICE PROCEDURE 1. Remove the following components; • cluster lid “C” (HVAC control surround trim) • fuse box cover • driver’s side instrument panel lower cover (attached with 2 screws). 2. Remove the screw from the center of the cable operated gear (see Figure 2). Figure 2 3. Locate the small (about 1″ dia.) white air mix door gear. Hopefully it is still on the floor. NOTE: If you cannot find the old air mix door gear, order a new gear. Refer to the Parts Information section of this bulletin. 4. To see how it is supposed to fit, temporarily install the gear into the air mix door shaft (see Figure 3). Figure 3 Air mix door drive gear (shown installed) Heater box Cable operated gear Retaining screw (remove) Front TP020106 Cable (do not detach) On the left side of the heater case, remove the screw from the center of the cable operated gear for the air mix door. Note: It is not necessary to detach the cable from the gear or the heater box. Proper pin location for air mix door/door gear with door/gear turned fully clock wise. Front TP010607a The gear can fit two different ways, only one of which is correct. Install the gear and rotate the gear/mix door shaft assembly fully clockwise so the gear’s index pin is at the 2 to 3 o’clock position. Cable (do not detach) Note: If the gear is in the correct spot, the alignment pin will be at the 2 to 3 o’clock position. POSITIONING THE GEAR CORRECTLY IS CRITICAL TO GETTING THE DOOR TIMING RIGHT. 3/5 5. Remove the gear, thoroughly clean the gear shaft of any grease, and apply the glue. See Figure 4. Figure 4 6. Re-install the gear into the mix door shaft (see Figure 5). Figure 5 TP010606a Air mix door gear (back side) Apply Glue to Shaded areas b. Apply plastic glue (3M dp-8005 or equivalent) to the shaft of the air mix door gear in the area where it inserts into the air mix door shaft. a. Thoroughly clean the air mix door gear shaft. Note: It is not necessary to clean the grease from the gear teeth. Front TP020100 Re-install the gear so the gear’s index pin is at the 2 to 3 o’clock position when the gear/mix door shaft assembly is turned fully clockwise. Proper pin location for air mix door/door gear with door/gear turned fully clock wise. 4/5 7. Set the HVAC control temperature dial as shown in Figure 6. Figure 6 8. Re-install the cable operated gear (see Figure 7). Figure 7 9. Operate the temperature control while watching the air mix door gear movement. They should operate freely with no binding. 10.Check the adjustment of the temperature cable as follows: A. Rotate the temperature control knob to the full COLD position (i.e., fully counterclockwise) and confirm the air mix door is fully seated (sealed) in the down position, then B. Rotate the temperature control knob to the full HOT position (i.e., fully clockwise) and confirm the air mix door is fully seated (sealed) in the up position. If the air mix door does not fully seat (seal) in either the full HOT or full COLD position: • Adjust the temperature control cable, with the temperature control knob in the full hot position, using the clip at the heater unit (see Figure 7) 11.Re-install the trim pieces removed in step 1.
