Canada - A/C - Front to Rear Heater Temerature Difference

Bulletin
TSB2411

Issue Date
2006-01-26

Market
Canada

Title
FRONT & REAR HEATER TEMPERATURE DIFFERENCE IN LOW AMBIENT CONDITIONS

Component
HEATING & AIR CONDITIONING

Models
'04 - '06 Sienna CE & LE w/Manual A/C

INTRODUCTION:
Some customers of 2004 -- 2006 model year Sienna vehicles with rear heater may experience a difference in the vent outlet temperature of the rear roof vents when compared to the front center vents in low ambient temperatures. Improved HVAC control logic has been developed to address this concern.

APPLICABLE VEHICLES:
- 2004 - 2006 model year Sienna CE and LE vehicles with manual A/C produced BEFORE the Production Change Effective VINs shown below.

PRODUCTION CHANGE INFORMATION:

PARTS INFORMATION:

WARRANTY INFORMATION:

REPAIR PROCEDURE:
1. Remove the instrument cluster finish panel center No. 1.
2. Remove the instrument cluster finish panel center No. 2.
3. Remove the shift lever knob sub--assembly.
4. Remove the instrument cluster finish panel assembly center.
5. Remove the instrument cluster finish panel garnish.
6. Remove the radio receiver assembly with bracket.

7. Remove the integration control and panel assembly.
A. Remove the 4 screws and release the integration control and panel assembly.
B. Disconnect the connectors and remove the integration control and panel assembly.

8. Remove the air conditioner amplifier assembly.
A. Remove the plate.

B. Release the lock tab of the conditioner control and disconnect the cable.

C. Remove the 4 screws and the heater control housing.

D. Remove the 4 screws and the air conditioner amplifier assembly.
E. Reassemble the air conditioner amplifier assembly in the reverse order of disassembly.
F. Confirm the rear heat controls are operational.

NOTE:
Issue of this Technical Service Bulletin is to ensure that proper repair information is available. IT DOES NOT CONSTITUTE AN AUTHORIZATION FOR REPAIR. Normal provisions of the formal warranty policy, as applicable, will apply.