Hello,

You didnt describe having to refill the coolant. I thought the light was just a low coolant level light. Is yours low? If so maybe a small leak or deteriorated rad/reservoir cap? I never like to jump to cracked head or blown headgasket before the simple fixes have been checked or exhausted.

Arlo

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W211 E550
HVAC/R Certified Technician

We topped off the system a few months back when we replaced the radiator. A week later the light would kick on whenever I was on a particularly sharp and long on-ramp. I put a little more coolant in and it hasn't come on since.

The reservoir cap is only a few years old.

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1982 300GD Carmine Red (DB3535) Cabriolet Parting Out
1990 300SEL Smoke Silver (Parting out)
1991 350SDL Blackberry Metallic (481)

"The thing is Bob, its not that I'm lazy...its that I just don't care."