SL-Class (R129) 1990-2002: SL 280, SL 300, SL 320, SL 500, SL 600, SL 60 AMG

SL/R129: Coolant Light On/Off

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Old Aug 8, 2014 | 10:12 AM
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1999 SL 500
Coolant Light On/Off

Hi, I bought 1999 SL500 (102kmi) few months ago.
So far so good but last week a coolant light started coming on.

I checked coolant levels - half a tank that I see at least.
No leaks at all.

AND the temp lights are all normal - when light goes on, nothing changes in reg to temp.

ALSO, weird thing is that the light goes on when I drive around 60mph or so BUT when I stop for few mins or go in slow traffic in doesn't go on or shuts off.

Btw, temperatures outside are about 60-70 degrees so no heat.

I had a 1994 Vette before and it did completely opposite (and I think all cars would heat up more when it's slow traffic or stopped).

Do you think it's just a sensor malfunction or I should worry a bit more.
Please, advise your thoughts...
Thank you
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