2021 TOYOTA TUNDRA air condition

3545-1. Using the air conditioning system
Seat heaters/seat ventilators
Turns the seat heater on
Hi
Mid
Lo
Off
The level indicator lights come on.
Press the “ ” on the button to up
and “ ” to down, and off.
■
Seat heater
Turns the seat heater on Hi
Mid
Lo
Off
The level indicator lights come on.
Pressing the button changes
modes in the following:
HiMid LoOff
: If equipped
The seat heaters and ventilator s heat the seats and maintain
good airflow by blowing air from the seats.
Seat heaters
1
2
3
4
Seat ventilators
1
2
3
4

3555-1. Using the air conditioning system
5
Interior features
■Seat ventilators
Blows air from the seat Hi
Mid
Lo
Off
The level indicator lights come on.
Pressing the button changes
modes in the following:
HiMid LoOff
■The seat heaters/seat ventilators can be used when
The engine switch is in ON.
■ Passenger seat ventilator timer (vehicles with seat ventilators )
● The ventilator operates on for 5 minutes after the button is pr essed.
● When the passenger is not detected, the automatically turns off the ventila-
tor after 5 minutes.
■ When not in use
Turn the seat heaters or seat ventilators off by pressing the b utton. The indi-
cator light turns off.
1
2
3
4
WARNING
■ Burns
● Use caution when seating the following persons in a seat with t he seat
heater on to avoid the possibility of burns:
• Babies, small children, the elderly, the sick and the physical ly chal-
lenged
• Persons with sensitive skin
• Persons who are fatigued
• Persons who have taken alcohol or drugs that induce sleep (sle eping
drugs, cold remedies, etc.)
● Do not cover the seat with anything when using the seat heater.
Using the seat heater with a blanket or cushion increases the t emperature
of the seat and may lead to overheating.
● Do not use seat heater more than necessary. Doing so may cause minor
burns or overheating.

3565-1. Using the air conditioning system
NOTICE
■To prevent damage to the seat heaters/seat ventilators
Do not put heavy objects that have an uneven surface on the sea t and do
not stick sharp objects (needles, nails, etc.) into the seat.
■ To prevent battery discharge
Turn the seat heaters/seat ventilators off when the engine is n ot running.

399
6Maintenance and care
6-1. Maintenance and careCleaning and protecting the vehicle exterior .......... 400
Cleaning and protecting the vehicle interior ........... 403
6-2. Maintenance Maintenance requirements ................... 406
General maintenance ........ 408
Emission inspection and maintenance (I/M)
programs ......................... 411 6-3. Do-it-yourself maintenance
Do-it-yourself service precautions ..................... 412
Hood ................................. 414
Engine compartment ......... 415
Tires .................................. 426
Tire inflation pressure ....... 442
Wheels .............................. 445
Air conditioning filter.......... 448
Wireless remote control/ electronic key battery ...... 451
Checking and replacing fuses ............................... 454
Light bulbs......................... 457

4026-1. Maintenance and care
NOTICE
■Cleaning the exterior lights
● Wash carefully. Do not use organic substances or scrub with a h ard brush.
This may damage the surfaces of the lights.
● Do not apply wax to the surfaces of the lights.
Wax may cause damage to the lenses.
■ Antenna installation a nd removal precautions
● Before driving, ensure that the antenna is installed.
● When the antenna is removed, such as before entering an automat ic car
wash, make sure to store it in a suitable place so as not to lose it. Also,
before driving, make sure to reinstall the antenna in its origi nal position.
■ When using a high pressure car wash
● Do not spray water directly on the radar which is equipped behi nd the
emblem. Otherwise it may cause the device to be damaged.
● Do not bring the nozzle tip close to boots (rubber or resin man ufactured
cover), connectors or the following parts. The parts may be dam aged if
they come into contact with high-pressure water.
• Traction related parts
• Steering parts
• Suspension parts
• Brake parts
● Keep the cleaning nozzle at least 11.9 in. (30 cm) away from th e vehicle
body. Otherwise resin section, such as moldings and bumpers, ma y be
deformed and damaged. Also, do not continuously hold the nozzle in the
same place.
● Do not spray the lower part of the windshield continuously.
If water enters the air conditioning system intake located near the lower
part of the windshield, the air conditioning system may not ope rate cor-
rectly.
● Do not wash the underside of the vehicle using a high pressure car
washer.
■ Cleaning the high mounted stoplight and cargo lamps
When using high-pressured car washers, the tip of the nozzle sh ould be at
least 20 in. (50 cm) from the car body. Water can seep lamp hou sing or the
vehicle cabin if the nozzle is closer to the car body.

4126-3. Do-it-yourself maintenance
Do-it-yourself ser vice precautions
If you perform maintenance by yourself, be sure to follow the
correct procedure as given in these sections.
ItemsParts and tools
Battery condition
(  P. 422)• Warm water• Baking soda• Grease
• Conventional wrench (for terminal clamp bolts)
Brake fluid level
( P. 420)• FMVSS No.116 DOT 3 or SAE J1703 brake fluid
• Rag or paper towel
• Funnel (used only for adding brake fluid)
Engine coolant
level ( P. 418)
• “Toyota Super Long Life Coolant” or a similar high
quality ethylene glycol-based non-silicate, non-
amine, non-nitrite and non-borate coolant with long-
life hybrid organic acid technology
For the U.S.A.:
“Toyota Super Long Life Coolant” is pre-mixed with
50% coolant and 50% deionized water.
For Canada:
“Toyota Super Long Life Coolant” is pre-mixed with
55% coolant and 45% deionized water.
• Funnel (used only for adding coolant)
Engine oil level
(  P. 416)• “Toyota Genuine Motor Oil” or equivalent
• Rag or paper towel
• Funnel (used only for adding engine oil)
Fuses
( P. 454)• Fuse with same amperage rating as original
Light bulbs
( P. 457)
• Bulb with same number and wattage rating as origi-
nal
• Phillips-head screwdriver
• Flathead screwdriver• Wrench
Power steering
fluid level

(
P. 421)
• Automatic transmission fluid DEXRON® II or III
• Rag or paper towel
• Funnel (used only for adding power steering fluid)
Radiator and
condenser
(
P. 420)

Tire inflation
pressure
(  P. 442)• Tire pressure gauge
• Compressed air source
Washer fluid
( P. 425)• Water or washer fluid containing antifreeze (for win-
ter use)
• Funnel (used only for adding water or washer fluid)

4136-3. Do-it-yourself maintenance
6
Maintenance and care
WARNING
The engine compartment contains many mechanisms and fluids that may
move suddenly, become hot, or become electrically energized. To avoid death
or serious injury, observe the following precautions.
■When working on the engine compartment
● Keep hands, clothing and tools away from the moving fan and eng ine
drive belt.
● Be careful not to touch the engine, radiator, exhaust manifold, etc., right
after driving as they may be hot. Oil and other fluids may also be hot.
● Do not leave anything that may burn easily, such as paper and r ags, in the
engine compartment.
● Do not smoke, cause sparks or expose an open flame to fuel or t he bat-
tery. Fuel and battery fumes are flammable.
● Be extremely cautious when working on the battery. It contains poisonous
and corrosive sulfuric acid.
■ When working near the electric cooling fan or radiator grille
Be sure the engine switch is off.
With the engine switch in ON, the electric cooling fan may auto matically
start to run if the air conditioning is on and/or the coolant temperature is
high. ( P. 420)
■ Safety glasses
Wear safety glasses to prevent flying or falling material, fluid spray, etc.,
from getting in your eyes.
NOTICE
■If you remove the air cleaner filter
Driving with the air cleaner filter removed may cause excessive engine wear
due to dirt in the air.

4206-3. Do-it-yourself maintenance
Check the radiator and condenser and clear away any foreign objects.
If either of the above parts is extremely dirty or you are not sure of
their condition, have your vehic le inspected by your Toyota dea ler.
■Checking fluid level
The brake fluid level should be
between the “MAX” and “MIN”
lines on the tank.
■Adding fluid
Make sure to check the fluid type and prepare the necessary ite m.
■Brake fluid can absorb moisture from the air
Excess moisture in the brake fluid can cause a dangerous loss o f braking effi-
ciency. Use only newly opened brake fluid.
Radiator and condenser
WARNING
■ When the engine is hot
Do not touch the radiator or condenser as they may be hot and c ause seri-
ous injuries, such as burns.
Brake fluid
Fluid type FMVSS No.116 DOT 3 or SAE J1703 brake fluid
Items Clean funnel