Mercedes-Benz R-Class 2008 Owners Manual - Manual (Page 157)

156
Controls in detail
Instrument cluster
The outside temperature sensor is located
in the front bumper area. Due to its loca-
tion, the sensor can be affected by road or
engine heat during idling or slow driving.
This means that the accuracy of the dis-
played temperature can only be verified by
comparison to a thermometer placed next
to the sensor, not by comparison to exter-
nal displays (e.g. bank signs etc.).
When moving the vehicle into colder
ambient temperatures (e.g. when leaving
your garage), you will notice a delay before
the lower temperature is displayed.
A delay also occurs when ambient temper-
atures rise. This prevents inaccurate
temperature indications caused by heat
radiated from the engine during idling or
slow driving.