S-Class (W126) 1979-1991: 300 SE, 300 SEL, 380 SE, 380 SEL, 420 SEL, 500 SEL, 560 SEL, 360 SEC, 500 SEC, 580 SEC, 300 SD TURBODIESEL, 300 SDL TURBO, 350 SD TURBO, 350 SDL TURBO

Dash Warning Light '87 300SDL

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Old 11-04-2014, 10:48 AM
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'80 300CD , '81 240D , more..
Dash Warning Light '87 300SDL

Yellow light with waves in it ~ looks like low coolant but it's full , we flushed & re filled the cooling system a month ago , it runs fine , not hot , what's the likely cause ? .

(is this the low coolant lamp ?) .

TIA ,
Old 12-01-2014, 12:13 AM
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1988 Mercedes 300SEL, 1991 Lexus LS400, 1972 Chevrolet Kingswood Estate, 1973 Pontiac Grand Ville
It sounds like it is your low coolant warning light. If it is on and your coolant level is correct it is probably a faulty sensor. I had a 1991 Lexus LS400 where the low coolant light stayed on all of the time, but it was full of coolant and the dealer said it was a bad sensor.

Since I knew it was full, I didn't bother with it. I just kept a check on the level and temperature gauge and all was fine for years. Most cars didn't have a warning light for this anyway and it just something you really need to keep a check on anyway rather than depending on a warning lamp.
Old 12-04-2014, 09:10 PM
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Post Low Coolant Lamp

Thanx ! .

I just made sure everything was topped up and off we went for two weeks and over 4,000 miles , everything was jake , no over heating , the lamp went out and stayed out .

We swapped out the incandescent rear lamps for LED ones , the taillights and turn signals etc. are all *much* brighter now but the lamp failure lamp on the dash came on due to the reduced resistance of LED's .

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