A/C - Dust Or Powder Blows From A/C Vents
T-SB-0163-11October 20, 2011
Dust from HVAC Vents
Service Category
Vehicle Interior
Section
Heating/Air Conditioning
Market
USA
Applicability
Introduction
Some vehicles may exhibit a condition where dust or powder is visible from the HVAC vents. A newly designed evaporator and HVAC system cleaning procedure has been developed to address this condition. The procedure listed below details evaporator removal HVAC system cleaning blower motor cleaning and installation.
Parts Information
Production Change Information
This TSB applies to:
^ All 2006 - 2011 MY Avalon vehicles.
^ All 2007 - 2011 MY North American produced Camry and Camry HV vehicles.
^ All 2007 - 2011 MY Japan produced Camry HV vehicles.
^ 2007 - 2011 MY Japan produced Camry vehicles manufactured BEFORE the Production Change Effective VINs shown.
Warranty Information
Required Tools & Equipment
Repair Procedure
1. Confirm the condition.
Check for white dust or powder on the top of the instrument panel and interior surfaces.
If white dust or debris is present check the cabin air filter for damage and for other external sources of debris. Proceed to step 2 for evaporator replacement if no external debris sources are found.
2. Remove the evaporator.
Refer to the Technical Information System (TIS) applicable model and model year Repair Manual:
3. Remove the HVAC ducts and registers from the dash pad.
4. Remove the center console ducts from the center console.
5. Verify all HVAC ducts and registers have been removed.
6. Blow out ALL the HVAC ducts with shop air.
7. Wipe out ALL the HVAC ducts with a damp shop rag.
8. Visually inspect the HVAC ducts and verify all of the dust has been removed. If additional dust is discovered repeat steps 6 and 7 until the dust has been completely removed.
9. Clean the HVAC registers by blowing the registers out with shop air.
10. Clean the side window defroster vents by blowing them out with shop air as shown.
11. Disassemble the HVAC case and remove the evaporator. If the HVAC case was not previously disassembled and the evaporator removed refer to the disassembly procedure in step 2.
12. Remove the heater core and blow out with shop air.
13. Blow out the evaporator tray with shop air. If there is still dust on the tray use a small brush or damp shop rag to clean the tray.
14. Clean the thermistor with shop air.
15. Use compressed air to blow out the evaporator case.
16. Wipe the evaporator case with a damp shop rag.
17. Clean the evaporator cover with a soft brush or damp shop rag.
18. Wipe out the blower motor housing with a damp shop rag.
19. Use shop air and blow in-between the fan and the blower motor housing.
20. Install the NEW evaporator.
Refer to TIS applicable model and model year Repair Manual:
21. Remove the dust cover on the back of the blower motor.
22. Use shop air and blow dust out of the blower motor commutator brushes and windings.
23. Reassemble the blower motor assembly.
24. After repair confirm proper operation of the HVAC controls and cooling and heater functions.