Mercedes-Benz 2000 SL-Class - Manual (Page 101)

97 Automatic climate control
Technical
data
Instruments
and controls
Operation Driving
Instrument
cluster display
Practical hints Car care Index
Dust filter
Nearly all dust particles and pollen are filtered out
before outside air enters the passenger compartment
through the air distribution system.
Notes:
Do not obstruct the air flow by placing objects on the air
flow through exhaust slots below the rear window.
Also keep the air intake grille in front of windshield free
of snow and debris.