2024 MAZDA CX90 radiator

Radar Sensors*
The radar sensor detects objects by
sending radio waves in a specific
direction and receiving the reflected
waves back.
Ve h i c l e f ro n t
1. Front radar sensor*
2. Front side radar sensors*

Ve h i c l e rea r
1. Rear side radar sensors*
CAUTION
 Heed the following cautions so that
the radar sensors can function
normally.
 Do not modify the suspensions.
 Always use tires of the specified
size and the same manufacturer,
brand, and tread pattern on all 4
wheels. In addition, do not use
tires with significantly different
wear patterns or tire pressures on
the same vehicle (including
temporary spare tire).
Do not spray highly pressurized
water against the radar sensors or
rub them strongly.
 Do not apply stickers on parts near
the radar sensors.
 If foreign matter adheres to parts
near the radar sensors, remove it
and switch the vehicle power OFF.
The foreign matter detection status
is reset by switching the vehicle
power OFF.
 Consult an Authorized Mazda
Dealer if you need to repair,
replace, or paint parts near the
radar sensors.
 Do not install any parts that cover
the front of the radar sensors.
 Do not replace the radiator grille
and emblem with anything other
than genuine products.
 If strong force is applied to parts near
the radar sensors, the direction of
the radar sensor may become
deviated and each system may not
operate normally. Stop each system
immediately and have the vehicle
inspected by an Authorized Mazda
Dealer.
NOTE
The radar sensors include a function
for detecting abnormalities in the
sensor, soiling of the sensor’s front
surface, and informing the driver. If a
message appears on the screen that
can be addressed, follow the
directions of the message.
Front radar sensor
The following systems utilize the front
radar sensor.
Distance & Speed Alert (DSA)Mazda Radar Cruise Control
(MRCC)
Cruising & Traffic Support (CTS)
Driving
Radar Sensors
*Some models.5-131
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Winter Driving
Carry emergency gear, including tire
chains, window scraper, flares, a small
shovel, jumper cables, and a small bag
of sand or salt.
Ask an Authorized Mazda Dealer to
check the following:
Have the proper ratio of antifreeze in
the radiator.
Refer to Inspecting the Coolant on
page 9-14.
Inspect the battery and its cables.
Cold reduces battery capacity.
Use an engine oil appropriate for the
lowest ambient temperatures that
the vehicle will be driven in (page
9-18).
Inspect the ignition system for
damage and loose connections.
Use washer fluid made with
antifreeze―but do not use engine
coolant antifreeze for washer fluid
(page 9-17).
When driving on ice or in water, snow,
mud, sand, or similar hazards:
Be cautious and allow extra distance
for braking.
Avoid sudden braking and sudden
maneuvering.
Do not pump the brakes. Continue
to press down on the brake pedal.
Refer to Antilock Brake System (ABS)
on page 5-84.
If you get stuck, select a lower gear
and accelerate slowly. Do not spin
the rear wheels.
For more traction in starting on
slippery surfaces such as ice or
packed snow, use sand, rock salt,
chains, carpeting, or other nonslip
material under the rear wheels.
NOTE
Remove snow before driving. Snow
left on the windshield is dangerous
as it could obstruct vision.
Do not apply excessive force to a
window scraper when removing ice
or frozen snow on the mirror glass
and windshield.
Never use warm or hot water for
removing snow or ice from windows
and mirrors as it could result in the
glass cracking.
Drive slowly. Braking performance
can be adversely affected if snow or
ice adheres to the brake
components. If this situation occurs,
drive the vehicle slowly, releasing the
accelerator pedal and lightly applying
the brakes several times until the
brake performance returns to
normal.
Driving
Winter Driving
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Ta k i n g A c t i o n w i t hOverheating
If the engine coolant temperature
gauge indicates overheating and the
high engine coolant temperature
warning light is displayed, the vehicle
loses power or you hear a loud
knocking or pinging noise, the engine
is probably too hot.
WARNING
Pull over to a safe location, then
switch the vehicle power off and
make sure the fan is not running
before attempting to work near the
cooling fan.
Working near the cooling fan when it is
running is dangerous. The fan could
continue running indefinitely even if
the engine has stopped and the engine
compartment temperature is high. You
could be hit by the fan and seriously
injured.
Do not remove either
cooling system cap when the engine
and radiator are hot.
When the engine and radiator are hot,
scalding coolant and steam may shoot
out under pressure and cause serious
injury.
Open the hood ONLY after steam is
no longer escaping from the engine.
Steam from an overheated engine is
dangerous. The escaping steam could
seriously burn you.

1. Drive safely to the side of the road and park off the right-of-way.
2. Shift into park (P).
3. Apply the parking brake.
4. Turn off the air conditioner.
5. Check whether coolant or steam is escaping from the engine
compartment.

If steam is coming from the engine
compartment:
Do not go near the front of the
vehicle. Stop the engine.
Wait until the steam dissipates,
then open the hood and start the
engine.

If neither coolant nor steam is
escaping:
Open the hood and idle the engine
until it cools.
CAUTION
If the cooling fan does not operate
while the engine is running, the
engine temperature will increase.
Stop the engine and call an
Authorized Mazda Dealer.
6. Make sure the cooling fan is operating, then turn off the engine
after the temperature has
decreased.
7. When cool, check the coolant level. If it is low, look for coolant leaks
from the radiator and hoses.

What to Do in Case of Emergency
Overheating
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If you find a leak or other damage, or
if coolant is still leaking:
Stop the engine and call an Authorized
Mazda Dealer.
1. Cooling system cap
2. Coolant reservoir
3. Cooling fan
4. Radiator
If you find no problems, the engine is
cool, and no leaks are obvious:
Carefully add coolant as required
(page 9-14).
CAUTION
If the engine continues to overheat or
frequently overheats, have the cooling
system inspected. The engine could be
seriously damaged unless repairs are
made. Consult an Authorized Mazda
Dealer.
What to Do in Case of Emergency
Overheating
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comprised of U.S. and Japanese
automobile manufacturers.
Inspecting the Coolant
WARNING
Do not use a match or live flame in
the engine compartment. DO NOT
ADD COOLANT WHEN THE ENGINE
IS HOT.
A hot engine is dangerous. If the
engine has been running, parts of the
engine compartment can become very
hot. You could be burned. Carefully
inspect the engine coolant in the
coolant reservoir, but do not open it.
Pull over to a safe location, then
switch the vehicle power off and
make sure the fan is not running
before attempting to work near the
cooling fan.
Working near the cooling fan when it is
running is dangerous. The fan could
continue running indefinitely even if
the engine has stopped and the engine
compartment temperature is high. You
could be hit by the fan and seriously
injured.
Do not remove either
cooling system cap when the engine
and radiator are hot.
When the engine and radiator are hot,
scalding coolant and steam may shoot
out under pressure and cause serious
injury.
NOTE
Changing the coolant should be done
by an Authorized Mazda Dealer.
Inspection and Servicing/Cleaning
Engine Compartment Inspection
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Inspect the antifreeze protection and
coolant level in the coolant reservoir at
least once a year―at the beginning of
the winter season ―and before
traveling where temperatures may drop
below freezing.

Inspect the condition and connections
of all cooling system and heater hoses.
Replace any that are swollen or
deteriorated.

There are two cooling circuits: one for
the automatic transmission, and the
other for the engine. Check both
circuits.
The coolant should be at full in the
radiator and between the F and L
marks, and between the FULL and
LOW marks on the coolant reservoir
when the engine is cool.
There are two coolant reservoir tanks.
Check each of them.
1. The tank for the EV system
2. The tank for the engine

If it is at or near the LOW position, add
enough coolant to the coolant
reservoir to provide freezing and
corrosion protection and to bring the
level to FULL.
Securely tighten the coolant reservoir
tank cap after adding coolant.
CAUTION
 Radiator coolant will damage paint.
Rinse it off quickly if spilled.
 If the “FL22” mark is shown on or
near the cooling system cap, use of
FL-22 is recommended when
replacing engine coolant. Using
engine coolant other than FL-22 may
cause serious damage to the engine
and cooling system.

If the coolant reservoir is empty or new
coolant is required frequently, consult
an Authorized Mazda Dealer.
Inspection and Servicing/Cleaning
Engine Compartment Inspection
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Brake fluid reservoirReplenishing WindshieldWasher Fluid
WARNING
Use only windshield washer fluid or
plain water in the reservoir.
Using radiator antifreeze as washer
fluid is dangerous. If sprayed on the
windshield, it will dirty the windshield,
affect your visibility, and could result in
an accident.
Using Washer Fluid Without
Anti-freeze Protection in Cold
Weather:
Operating your vehicle in temperatures
below 4 ℃ (40 °F) using washer fluid
without anti-freeze protection is
dangerous as it could cause impaired
windshield vision and result in an
accident. In cold weather, always use
washer fluid with anti-freeze
protection.
CAUTION
Do not use soapy water or engine
antifreeze in the reservoir as it could
cause paint discoloration or pump
damage.
NOTE
State or local regulations may restrict
the use of volatile organic
compounds (VOCs), which are
commonly used as anti-freeze agents
in washer fluid. A washer fluid with
limited VOC content should be used
only if it provides adequate freeze
resistance for all regions and climates
in which the vehicle will be
operated.
Inspection and Servicing/Cleaning
Engine Compartment Inspection
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