Residual Heat And Ventilation - Mercedes-Benz 2005 M-Class Operator's Manual

Controls in detail
Automatic climate control
!
If the ° button on the automatic
climate control panel starts to flash,
this indicates that the air conditioning
system is losing refrigerant. The com-
pressor has turned itself off. The air
conditioning cannot be turned on
again.
Have the air conditioning system
checked at the nearest authorized
Mercedes-Benz Light Truck Center.
142

Residual heat and ventilation

With the engine switched off, it is possible
to continue to heat or ventilate the interior
for up to 30 minutes. This feature makes
use of the residual heat produced by the
engine.
i
How long the system will provide heat-
ing depends on the coolant tempera-
ture and the temperature set by the
operator. The blower will run at lower
speed regardless of the air volume con-
trol setting.
Activating
Turn the key in the steering lock to
position 0 or 1 ( page 33).
Press button ° ( page 137).
The indicator lamp on button °
comes on.
Deactivating
Press button °.
The indicator lamp on button °
goes out.
i
The residual heat is automatically
turned off:
when the ignition is switched on
after about 30 minutes
if the coolant temperature is too
low
if the battery voltage drops