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  #1  
Old 07-06-2018, 08:39 AM
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What does this do?

Hello..

I have a knob on the dash of my coupe that doesn't appear to do anything.
I have circled it in yellow. It pulls towards the driver with a positive click, ie on/off, no turn. From left: (non functioning) rheostat, the hazard switch, air vent, magic mystery knob, rear courtesy light switch.

The car has no fog lights front or rear, and doesn't appear to have ever had any. It's not a radio fader either.

Any ideas? Thanks.

Dave
Attached Thumbnails
What does this do?-dash.jpg  
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1971 W111 280se rhd coupe (The Duchess)
1959 Bristol 406 (Monty)
1970 Volvo Amazon 131 (Lola)
Lives in Cornwall, UK.
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  #2  
Old 07-06-2018, 09:08 AM
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Location: Tucson, AZ
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Most likely rear windscreen defroster.
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  #3  
Old 07-06-2018, 09:11 AM
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Ok..makes sense..didn't think of that because car has no heated rear screen, but screen has been changed. I imagine a '71 3.5 coupe probably had a heated rear screen as standard?

Thanks.
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1971 W111 280se rhd coupe (The Duchess)
1959 Bristol 406 (Monty)
1970 Volvo Amazon 131 (Lola)
Lives in Cornwall, UK.
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  #4  
Old 07-06-2018, 02:45 PM
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Now you can repurpose the switch for a James Bond ejection seat. Just be sure to get one for a RHD model and not a LHD one from the USA is it will be on the wrong side.
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  #5  
Old 07-06-2018, 06:33 PM
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Good point....don't want to make such a potentially fatal error whilst battling the bad guy.
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1971 W111 280se rhd coupe (The Duchess)
1959 Bristol 406 (Monty)
1970 Volvo Amazon 131 (Lola)
Lives in Cornwall, UK.
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  #6  
Old 07-08-2018, 11:16 AM
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Location: Miami Beach, Florida
Posts: 472
That button also lights up when it's on.
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1976 280C
SLOWER DRIVERS KEEP TO THE RIGHT.
DRIVE RIGHT PASS LEFT
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  #7  
Old 07-08-2018, 12:22 PM
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Does it? I don't see how..the white dot is a solid sticker type thing, as opposed to the visible bulb in the knob for the hazard switch for example. I'll have to take a closer look.
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1971 W111 280se rhd coupe (The Duchess)
1959 Bristol 406 (Monty)
1970 Volvo Amazon 131 (Lola)
Lives in Cornwall, UK.
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  #8  
Old 07-08-2018, 02:09 PM
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Quote:
Originally Posted by amazon69 View Post
Does it? I don't see how..the white dot is a solid sticker type thing, as opposed to the visible bulb in the knob for the hazard switch for example. I'll have to take a closer look.
On my car (76 280C) the white dot lights up. I'll take a pic tonight when it's really visible.
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1976 280C
SLOWER DRIVERS KEEP TO THE RIGHT.
DRIVE RIGHT PASS LEFT
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  #9  
Old 07-09-2018, 09:39 PM
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Join Date: Jun 2010
Location: Miami Beach, Florida
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Quote:
Originally Posted by amazon69 View Post
Does it? I don't see how..the white dot is a solid sticker type thing, as opposed to the visible bulb in the knob for the hazard switch for example. I'll have to take a closer look.
Here are the pics of said button...
Attached Thumbnails
What does this do?-img_5318.jpg   What does this do?-img_5314.jpg  
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1976 280C
SLOWER DRIVERS KEEP TO THE RIGHT.
DRIVE RIGHT PASS LEFT
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  #10  
Old 07-10-2018, 08:39 PM
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Join Date: Aug 2007
Location: Middle Haddam, CT
Posts: 241
The manual for my 1972 300SEL says that button (which does light up when pulled out) turns on heated rear window. The heat lines are very fine.
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Berfinroy in CT
Present vehicles:
1973 300 SEL 4.5
1959 Rolls Royce Silver Cloud I
Past vehicles;
1958 Bentley S 1
1976 ex-Max Hoffman 6.9
1970 300SEL 2.8
1958 Jaguar MK IX
1961 Jaguar MK IX
1963 Jaguar E-type factory special roadster
1948 Plymouth woody
1955 Morgan plus 4
1966 Shelby GT350H Mustang
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