Mercedes-Benz GLC 2017 Operator's Manual page 150

Refueling
148
To avoid transporting already opened refill con-
tainers in the vehicle, completely empty refill
bottles or canisters when filling the DEF tank, if
possible.
For further information on DEF, see
( page 361).
Y
Opening/closing the DEF filler cap
To open:switch the ignition off.
X
Press the fuel filler flap in the direction of
X
arrow :.
The fuel filler flap swings up.
Turn blue DEF filler cap ; counter-clockwise
X
and remove it.
DEF filler cap ; is secured with a plastic
strip.
To close: place DEF filler cap ; on the filler
X
neck and turn it clockwise.
To close the fuel filler flap, press it in the
X
direction of arrow :.
Drive faster than 10 mph (16 km/h).
X
The Refill AdBlue See Operator's Man‐
ual message goes out after approximately
one minute.
If the Refill AdBlue See Operator's Man‐
ual message continues to be shown in the mul-
tifunction display, you must add more DEF.
i
The fuel filler flap is unlocked or locked
automatically when you unlock or lock the
vehicle.
DEF refill canisters
!
Do not screw the disposable hose on too
tight. The disposable hose could otherwise be
damaged and DEF may leak out.
Unscrew the cap from the opening on top of
X
DEF refill canister ;.
Place disposable hose : on the opening of
X
DEF refill canister ; and screw it on clock-
wise until hand-tight.
Disposable hose : remains closed until you
fasten disposable hose : to the DEF filler
neck of the vehicle.
Place disposable hose : on the filler neck on
X
the vehicle and screw it on clockwise until
hand-tight. When you feel resistance, dispos-
able hose : is sufficiently secured.
Lift up and tip DEF refill canister ;.
X
Filling stops when the DEF tank is completely
filled. Do not fill the DEF tank any further. DEF
refill canister ; can be removed when it has
been only partially emptied.
Turn disposable hose : on the filler neck of
X
the vehicle counter-clockwise and remove it.
Turn disposable hose : on the opening of
X
DEF refill canister ; counter-clockwise and
remove it.
Reseal DEF refill canister ; with the cap.
X
DEF refill canisters are available at many gas
stations or at a qualified specialist workshop.
DEF refill canisters are often sold with a filler
hose. A filler hose that does not exactly fit the
vehicle's DEF tank offers no protection against