The heater control bulb lights up the heating controls on the Mk4 Jetta, Golf and New Beetle. It is an easy, 5 minute fix, just follow the instructions in the video below.
How To Replace the Heater Control Bulb

The heater control bulb lights up the heating controls on the Mk4 Jetta, Golf and New Beetle. It is an easy, 5 minute fix, just follow the instructions in the video below.