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Some customers may experience decreased air volume from the HVAC vents when the temperature is set to maximum heat. Use the following repair procedure to address the customer concerns. Production Change Information This TSB applies to vehicles produced BEFORE the Production Change Effective VINs shown below. MODEL Tacoma DRIVETRAIN All 2WD 4WD PLANT NUMMI TMMBC PRODUCTION CHANGE EFFECTIVE VIN 5TE###2N#9Z593323 3TM#U#2N#9M070971 3TM#U#2N#9M007845 Repair Procedure 1. Remove the Air Conditioning unit. Refer to the Technical Information System (TIS), model year repair manual: • 2007 / 2008 Tacoma Vehicle Interior – Heating/Air Conditioning – “Air Conditioning Unit: Removal” 2. Remove the 4 bolts and the lower defrost nozzle assembly. 3. Remove the 2 bolts and the heater to register duct. 4. Remove the No. 1 air duct. A. Remove the bolt. B. Disengage the 3 claws and remove the air duct. 5. Remove the air inlet assembly. A. Remove the air ?lter. B. Remove the 4 bolts and 1 clip that mount the air inlet assembly. C. Remove the cooler thermistor clip from the air inlet case. Figure 5. 6. Remove the mode damper control assembly. A. Remove the 3 bolts on the mode mounting plate. B. Remove the mode damper control assembly including mode cam, mode mounting plate, and mode control servo. 7. Remove the temperature damper control assembly. A. Remove the 3 bolts on the temperature control mounting plate. B. Remove the temperature damper control assembly including temperature control cam, mounting plate, and servo. Figure 9. 8. Remove the bolt and the heater pivot. 9. Remove the mode case. A. Remove the 11 bolts and 1 clip that mount the mode case. Figure 12. 10. Remove the evaporator core. Figure 13. 11. Remove the top half of the HVAC main case. A. Remove the torx bolt and heater pipe clamp. B. Remove the 2 clips and 15 bolts that mount the top half of the case. Figure 14. 12. Disengage and remove the heater air damper door from the HVAC main case. Figure 16.

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12. REMOVE A/C CONTROL ASSEMBLY Remove the 2 screws and pull out the A/C control assembly, then disconnect the connector. NOTE: Be careful not to vent the mode control cable, when pull out the A/C control assembly. INSTALLATION 1. INSTALL A/C CONTROL ASSEMBLY a. Connect the connector. b. Pass the heater control cables as shown in the illustration. COMPONENTS REMOVAL 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. REMOVE COWL SIDE TRIMS REMOVE FRONT DOOR SCUFF PLATES REMOVE LOWER FINISH PANEL REMOVE LOWER INSERT PANEL REMOVE CENTER CLUSTER FINISH PANEL REMOVE HEATER TO RESISTOR NO.2 DUCT REMOVE LOWER PANEL REMOVE REAR CONSOLE BOX REMOVE SHIFTING HOLE BEZEL REMOVE FINISH LOWER CENTER PANEL 11. DISCONNECT HEATER CONTROL CABLE c. Install the 2 set screws. 2. CONNECT HEATER CONTROL CABLES a. Set Air inlet control lever at “RECIRC” position b. Set Temperature control dial at “MAX. COOL” position c. Set Mode control dial at “DEF” position Zoom d. Adjust air inlet control cable. Set air inlet damper control lever to “RECIRC” position and connect the inner cable to lever pin and clamp the outer cable. HINT: Lock the clamp while lightly pushing the outer cable to the direction shown by arrow in the illustration. Sized for Print Zoom e. Adjust air mix control cable. Set air mix damper control lever to “MAX. COOL” position and connect the inner cable to lever pin and clamp the outer cable. HINT: Lock the clamp while lightly pulling the outer cable to the direction shown by arrow in the illustration. Sized for Print

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Room temperature sensor circuit Ambient temperature sensor circuit Evaporator temperature sensor circuit Engine coolant temperature commu- nication circuit Solar sensor circuit (short) (Passenger side) Solar sensor circuit (open) Compressor lock sensor circuit Pressure switch circuit Solar sensor circuit (short) (Driver side) Solar sensor circuit (open) Air mix damper position sensor circuit (Passenger side) Air inlet damper position sensor circuit Air outlet damper position sensor circuit 2003 4RUNNER REPAIR MANUAL (RM1001U) Air mix damper position sensor circuit (Driver side) Air mix damper control servomotor (Passenger side) Air inlet damper control servomotor Air outlet damper control servomotor Air mix damper control servomotor (Driver side)