T-SB-0004-22 Rev

T-SB-0004-22
Rev1
January 31, 2022
Intermittent Whistle Noise Through Vents With Air
Conditioning ON
Service
Category
Vehicle Interior
Section
Heating/Air Conditioning
Market USA
Applicability
YEAR(S)
MODEL(S)
2016 - 2023
Tacoma
ADDITIONAL INFORMATION
REVISION NOTICE
November 07, 2022 Rev1:
 Applicability has been updated to include 2023 model year Tacoma vehicles.
Any previous printed versions of this bulletin should be discarded.
Introduction
Some 2016 – 2023 model year Tacoma vehicles may exhibit what customers describe as a
1 – 3-second whistle noise from the HVAC system when the air conditioning system is ON. The
whistle noise may occur as the compressor cycles on and off and is more prevalent with increased
engine RPM during hot ambient temperatures. Follow the Repair Procedure in this bulletin to
address this condition.
Warranty Information
OP CODE
DESCRIPTION
TIME
OFP
T1
T2
883611
R & R HVAC Evaporator Sub-assy
*
88511-04020
91
99
*See the flat rate manual.
APPLICABLE WARRANTY
 This repair is covered under the Toyota Basic Warranty. This warranty is in effect for 36 months
or 36,000 miles, whichever occurs first, from the vehicle’s in-service date.
 Warranty application is limited to occurrence of the specified condition described in
this bulletin.
© 2021 Toyota Motor Sales, USA
Page 1 of 3
T-SB-0004-22
Rev1
January 31, 2022
Page 2 of 3
Intermittent Whistle Noise Through Vents With Air Conditioning ON
Parts Information
PART NUMBER
PREVIOUS
NEW
88511-04020
88501-04070
PART NAME
QTY
Evaporator Sub-assy
1
SUPPLIER
QTY
Required Tools & Equipment
REQUIRED EQUIPMENT
Techstream ADVI*
PART NUMBER
TSADVUNIT
Techstream 2.0
TS2UNIT
ADE
1
Techstream Lite
TSLITEPDLR01
Techstream Lite (Green Cable)
TSLP2DLR01
*Essential SST.
NOTE
 Only ONE of the Techstream units listed above is required.
 Software version 17.20.013 or later is required.
 Additional Techstream units may be ordered by calling Approved Dealer Equipment (ADE)
at 1-800-368-6787.
REQUIRED EQUIPMENT
SUPPLIER
PART NUMBER
Robinair R1234YF A/C Machine
ADE
ROB118150008
NOTE
Additional refrigerant service equipment may be ordered by calling Approved Dealer Equipment (ADE)
at 1-800-368-6787.
© 2021 Toyota Motor Sales, USA
T-SB-0004-22
Rev1
January 31, 2022
Page 3 of 3
Intermittent Whistle Noise Through Vents With Air Conditioning ON
Repair Procedure
1. Confirm the condition exists.
A. Turn the vehicle ON.
B. Leave the vehicle running in Park (P) and ensure the brake is firmly applied.
C. Turn the air conditioning ON and set the temperature to low.
D. Slowly bring the engine speed to 3,000 RPM and hold it at 3,000 RPM until the
compressor begins to cycle on and off.
Is there a 1 – 3-second whistle noise heard from the air conditioning system each time the
compressor cycles on and off during hot ambient temperatures?

YES — Continue to step 2.

NO — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
2. Remove the air conditioning unit.
Refer to TIS, applicable model and model year Repair Manual:

2016 / 2017 / 2018 / 2019 / 2020 / 2021 / 2022 / 2023 Tacoma:
Vehicle Interior – Heating/Air Conditioning – “Air Conditioning:
Air Conditioning Unit: Removal”
3. Remove the evaporator core.
Refer to TIS, applicable model and model year Repair Manual:

2016 – 2023 Tacoma:
Vehicle Interior – Heating/Air Conditioning – “Air Conditioning:
Air Conditioning Unit: Disassembly”
4. Install the NEW evaporator core.
Refer to TIS, applicable model and model year Repair Manual:

2016 – 2023 Tacoma:
Vehicle Interior – Heating/Air Conditioning – “Air Conditioning:
Air Conditioning Unit: Reassembly”
5. Reinstall the air conditioning unit.
Refer to TIS, applicable model and model year Repair Manual:

2016 / 2017 / 2018 / 2019 / 2020 / 2021 / 2022 / 2023 Tacoma:
Vehicle Interior – Heating/Air Conditioning – “Air Conditioning:
Air Conditioning Unit: Installation”
6. Confirm the whistle noise is no longer present by repeating step 1.
© 2021 Toyota Motor Sales, USA