2015 LEXUS RX350 radiator

6664-3. Do-it-yourself maintenance
CAUTIONThe engine compartment contains many mechanisms and fluids that may move sud-
denly, 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 fans and engine drive belt.●
Be careful not to touch the engine, radiator , exhaust manifold, etc. right after driv-
ing as they may be hot. Oil and other fluids may also be hot.●
Do not leave anything that may burn easi ly, such as paper and rags, in the engine
compartment.●
Do not smoke, cause sparks or expose an open flame to fuel or the battery. 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 fans or radiator grille
Be sure the “ENGINE START STOP” switch is off.
With the “ENGINE START STOP” switch in IGNITION ON mode, the electric
cooling fans may automatically start to run if the air conditioning is on and/or the
coolant temperature is high. (  P. 6 7 8 )■
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.

6704-3. Do-it-yourself maintenance
Engine compartment
Engine oil filler cap
(  P. 675)
Engine oil level dipstick
(  P. 6 74 )
Battery (  P. 6 8 1 )
Brake fluid reservoir
(  P. 6 7 9 )
Fuse box (  P. 703) Engine coolant reservoir
(  P. 677)
Condenser (  P. 6 7 8 )
Radiator (  P. 6 7 8 )
Electric cooling fans
Washer fluid tank (  P. 683)

6784-3. Do-it-yourself maintenance
Radiator and condenser
Check the radiator and condenser an d clear away any foreign objects.
If either of the above parts are extremely dirty or you are not sure of their
condition, have your vehicle checked by your Lexus dealer.■
If the coolant level drops within a short time after replenishing
Visually check the radiator, hoses, radiator cap, drain cock and water pump.
If you cannot find a leak, have your Lexus dealer test the cap and check for leaks in
the cooling systems.
CAUTION■
When the engine is hot
Do not remove the radiator cap.
The cooling system may be under pressure and may spray hot coolant if the cap is
removed, causing serious injuries, such as burns.
NOTICE■
When adding engine coolant
Coolant is neither plain water nor straight antifreeze. The correct mixture of water
and antifreeze must be used to provide proper lubrication, corrosion protection
and cooling. Be sure to read the antifreeze or coolant label.■
If you spill coolant
Be sure to wash it off with water to prevent damage to parts or paint.
CAUTION
■
When the engine is hot
Do not touch the radiator or condenser as they may be hot and cause serious inju-
ries, such as burns.

5
When trouble arises
7995-2. Steps to take in an emergency
If your vehicle overheats
Correction procedures
Stop the vehicle in a safe place and turn off the air conditioning
system, and then stop the engine.
If you see steam:
Carefully lift the hood after the steam subsides.
If you do not see steam:
Carefully lift the hood.
After the engine has cooled down
sufficiently, inspect the hoses and
radiator core (radiator) for any
leaks.
Radiator
Cooling fans If a large amount of coolant leaks,
immediately contact your Lexus
dealer.
The coolant level is satisfactory if it
is between the “FULL” and “LOW”
lines on the reservoir.
Reservoir
“FULL” line
“LOW” line
Radiator capThe following may indicate that your vehicle is overheating.
● “ENGINE OVERHEAT” is shown on the multi-information display.
● Steam comes out from under the hood. STEP 1
STEP 2
STEP 3
STEP 4

8005-2. Steps to take in an emergency
Add coolant if necessary.
(
 P. 6 7 1 )
Water can be used in an emer-
gency if coolant is unavailable.
Start the engine and turn the air conditioning system on to check
that the radiator cooling fans op erate and to check for coolant
leaks from the radiator or hoses. The fans operate when the air conditio ning system is turned on immedi-
ately after a cold start. Confirm that the fans are operating by checking
the fan sound and air flow. If it is diff icult to check these, turn the air con-
ditioning system on and off repeatedly.
(The fans may not operate in freezing temperatures.)
If the fans are not operating:
Stop the engine immediately and contact your Lexus dealer.
If the fans are operating:
Have the vehicle inspected at the nearest Lexus dealer.STEP 5
CAUTION■
To prevent an accident or injury when in specting under the hood of your vehicle●
If steam is seen coming from under the hood, do not open the hood until the
steam has subsided. The engine compartm ent may be very hot, causing serious
injuries such as burns.●
Keep hands and clothing (especially a tie, a scarf or a muffler) away from the fans
and belts. Failure to do so may cause the hands or clothing to be caught, resulting
in serious injury.
●
Do not loosen the radiator cap while the engine and radiator are hot.
Serious injury, such as burns, may resu lt from hot coolant and steam released
under pressure.STEP 6
STEP 7

877Alphabetical index
Mirrors
Inside rear view mirror .......................92
Side mirror heaters* .......................... 361
Side mirrors............................................. 95
Vanity mirrors .......................................610
Mobile Assistant*................................. 343
Moon roof .................................................. 101
MP3 disc* ..................................... 384, 501
Multi-display light control................... 615
Multi-information display
Switches ................................................. 200
Trip information .................................. 203
Noise from under vehicle .....................23
Odometer .................................................. 191
Oil
Engine oil ............................................... 674
Opener
Back door ................................................ 56
Fuel filler door ...................................... 105
Hood ....................................................... 667
Outer foot lights
Outer foot lights................................. 595
Wattage ................................................... 817
Outside rear view mirrors
Adjusting and folding ......................... 95
Mirror position memory ....................76
Outside temperature display*.......... 613
Overhead console .............................. 606
Overhead courtesy lights
Overhead courtesy lights ............. 595
Wattage ................................................... 817
Overheating, Engine ...........................799 Paddle shift switches .................... 171, 178
Parking assist sensors* ....................... 245
Parking brake .......................................... 189
Parking lights
Replacing light bulbs ..........................719
Switch.......................................................... 211
PCS
Function ..................................................278
Pre-collision braking off
switch.................................................... 279
Warning light ....................................... 745
Personal lights
Switch...................................................... 596
Phone* .......................................... 433, 565
Power back door ..................................... 56
Power easy access system .................. 78
Power outlet............................................. 616
Power windows ........................................98
Pre-collision system
Function ..................................................278
Pre-collision braking off
switch.................................................... 279
Warning light ....................................... 745
Radar cruise control ............................ 232
Radiator .................................................... 678
Radio*............................................ 368, 483
Rear seat entertainment system*
Rear seats
Folding down .......................................... 72
Seat adjustment ..................................... 72
Rear turn signal lights
Replacing light bulbs ..........................719
Wattage ................................................... 817
*: For vehicles with a navigation system, refer to the “Navigation System Owner’s Manual”.N O P
R