S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600

water temperature warning light

Old Feb 9, 2023 | 02:15 AM
  #1  
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w221 s550
water temperature warning light

hello
This is a 2007 w221 s550 gasoline vehicle.
The following warning lights come on from time to time
No sensor error in diagnosis
Responds well to cooling fan output %
I replaced the thermostat
No abnormal coolant level
If anyone has experience or knows the cause, I'd love to share
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Old Feb 9, 2023 | 03:47 AM
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2007 S550
Maybe corrosion in the coolant temperature sensor connector. If you dig deep enough to look at it, you might as well replace it. It's only $20.

What's that other dash light? The one above your MPH. Is that Distronic? I don't have it so I've never seen the indicator.
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Old Feb 9, 2023 | 01:27 PM
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Originally Posted by Shadly1

What's that other dash light? The one above your MPH. Is that Distronic? I don't have it so I've never seen the indicator.
its a graphic - not a light - he has a beep enabled, that detects if you aren't paying attention - its an additional feature with Distronic Plus - linked to BAS Plus (brake assist) - in today's world it like "city safety" but Merc forgot to put the brakes on - but if you instigate it brings a lively response to slowing down
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