Controls and features -> Engine coolant temperature gauge for your BMW 3 Series 1997-2006

Fuel gauge  
Engine coolant temperature gauge  
81  
Between the blue and red zones  
Normal operating range. The needle  
may rise as far as the edge of the red  
sector during normal operation.  
Once the indicator lamp stays on con-  
tinuously, there are still approx.  
2 gallons/8 liters of fuel in the fuel tank.  
Blue  
The engine is still cold. Drive at moder-  
ate engine and vehicle speeds.  
Fuel tank capacity approx. 16.6 gal./  
63 liters.  
Red  
If the tilt of the vehicle varies – when  
you are driving in mountainous areas,  
for example – the needle may fluctuate  
slightly.  
When you switch on the ignition, the  
warning lamp comes on briefly as an  
operation check.  
If the lamp comes on while operating  
the vehicle: the engine has overheated.  
Switch off the engine immediately and  
allow it to cool down.  
Fill the fuel tank before it is com-  
pletely empty. Driving to the last  
drop of fuel can prevent the engine  
from operating properly and result in  
damage.<  
To check the coolant level, refer to  
page 126.  
When you switch on the ignition, the  
indicator lamp lights up briefly as an  
operation check.