Page 25 of 498
23 At a glance
Cockpit
Item
Page
1
Steering wheel gearshift 
buttons 
(CLK 500, CLK 55 AMG)
172
2
Combination switch
Turn signals
Windshield wipers
High beam
51
52
51
3
Cruise control lever
255
4
Multifunction steering 
wheel
26,
138
5
Instrument cluster
24,
134
6
Lever for voice control 
system*, see separate op-
erating instructions
7
Starter switch
34
8
Front Parktronic* warning 
indicator
262
Item
Page
9
Overhead control panel
29
a
Glove box
272
b
Cup holder
275
c
Center console
27, 28
d
Hood lock release
308
e
Horn
f
Steering wheel adjustment 
stalk
40
g
Parking brake pedal
49
h
Door control panel
30
j
Parking brake release
49
k
Exterior lamp switch
50,
124
l
Exterior rear view mirror 
adjustment
41
m
Headlamp washer switch*
178 
     
        
        Page 310 of 498

308 OperationEngine compartmentHood
Opening
The hood lock release lever is located to 
the left of the steering wheel under the 
dashboard.
1Hood lock release lever
Pull lever 1 downwards.
The hood is unlocked.
2Lever for opening the hood
Push lever2 under the hood upwards.
Pull up on the hood and then release it.
The hood will be automatically held 
open at shoulder height by gas-filled 
struts.
Warning!
G
Do not pull the release lever while the vehi-
cle is in motion. Otherwise the hood could 
be forced open by passing air flow. 
!To avoid damage to the windshield wip-
ers or hood, never open the hood if the 
wiper arms are folded forward away 
from the windshield.
Warning!
G
To help prevent personal injury, stay clear of 
moving parts when the hood is open and the 
engine is running. Make sure the hood is 
properly closed before driving. When closing 
the hood, use extreme caution not to catch 
hands or fingers.
The radiator fan may continue to run for 
approximately 30 seconds or even restart 
after the engine has been turned off. Stay 
clear of fan blades. 
     
        
        Page 315 of 498

313 Operation
Engine compartment
Coolant
The engine coolant is a mixture of water 
and anticorrosion/antifreeze. To check 
the coolant level, the vehicle must be 
parked on level ground and the engine 
must be cool.
The coolant expansion tank is located on 
the passenger side of the engine 
compartment.
1Coolant expansion tank
2Cap
Using a rag, turn cap 2 slowly 
approximately one half turn to the left 
to release any excess pressure.
Continue turning the cap 2 to the left 
and remove it.
The coolant level is correct if the level
for cold coolant: reaches the black top 
part of the reservoir
for warm coolant: is approx. 0.6 in 
(1.5 cm) higher
Add coolant as required.
Replace and tighten cap 2.
More information on coolant can be found 
in the “Technical data” section 
(
page 452). 
Warning!
G
In order to avoid any possibly serious burns:
Use extreme caution when opening the 
hood if there are any signs of steam or 
coolant leaking from the cooling system, 
or if the coolant temperature gauge indi-
cates that the coolant is overheated.
Do not remove pressure cap on coolant 
reservoir if the coolant temperature is 
above 158°F (70°C). Allow the coolant 
to cool down before removing cap. The 
coolant reservoir contains hot fluid and 
is under pressure.
Using a rag, slowly open the cap approx-
imately 
1/2 turn to relieve excess pres-
sure. If opened immediately, scalding 
hot fluid and steam will be blown out un-
der pressure.
Do not spill antifreeze on hot engine 
parts. Antifreeze contains ethylene gly-
col which may burn if it comes into con-
tact with hot engine parts. 
     
        
        Page 413 of 498

411 Practical hints
Replacing wiper blades
Replacing wiper blades
Removing wiper blades
Remove SmartKey from starter switch.
Fold the wiper arm forward.1Unlock
2Lock
Pull the tab in direction of arrow1 and 
remove windshield wiper.
Installing wiper blades
Slide the wiper blade into the cutout on 
the wiper arm (see arrows).
Slide the tab back in the direction of 
arrow2 until it audibly engages.
Fold the wiper arm backward to rest on 
the windshield. Make sure you hold on 
to the wiper when folding the wiper arm 
back.
Warning!
G
For safety reasons, switch off wipers and 
remove SmartKey from starter switch 
(vehicles with KEYLESS-GO*: make sure the 
vehicle’s on-board electronics have 
status
0) before replacing a wiper blade. 
Otherwise, the wiper motor could suddenly 
turn on and cause injury.
!Never open the hood when the wiper 
arms are folded forward.
Hold on to the wiper when folding the 
wiper arm back. If released, the force 
of the impact from the tensioning 
spring could crack the windshield.
Do not allow the wiper arms to contact 
the windshield glass without a wiper 
blade inserted.
Make certain that the wiper blades are 
properly installed. Improperly installed 
wiper blades may cause windshield 
damage.
For your convenience, we recommend 
that you have this work carried out by 
an authorized Mercedes-Benz Center.