Date registered: May 2005
Vehicle: '07 GL320CDI
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
RE: 2005 E-320 CDI defroster and operation
If you're talking about the pushbutton front defrost control it's purpose is maximum/quickest defrost. It will ALWAYS be maximum heat.
You're supposed to turn off the button and then rely on normal heat--some directed to windshield--for "demisting." Only the latter is contolled by temperature selection.
If you survey a bunch of European cars you'll always see the result of regulations requiring an easily determined path for max defrost. It's always and obviously max heat.
Understand of course the difference between defrost and demist.