SL-Class (R230) 2003 -- 2012: Discussion on the SL500, SL550, SL600

SL/R230: Coolant Level Warning light when coolant full

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Old 04-10-2023, 05:15 PM
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R230 SL350
Coolant Level Warning light when coolant full

Coolant warning light on (pix 1) despite coolant being full (pix2). Bought a replacement sensor (pix3)

Coolant warning light

Coolant full. Can this sensor be replaced or is it sealed in overflow tank? Is their a part number?

Bought new sensor based on my registration but does not match sensor on the car
based on my registration, Is this issue likely to be the sensor?

Last edited by Barry SL R230; 04-10-2023 at 05:56 PM.
Old 04-10-2023, 05:47 PM
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r230 sl500
Is that not the brake fluid reseviour in your second picture??
Old 04-10-2023, 08:28 PM
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2007 SL550 & 2012 S550 4matic
As the rules of MMB DIY say Scan first, diagnose , buy correct parts, remove install according to our Work shop Instructions. You should have the car scanned by a MB capable scanner , preferably with DAS Xentry or equivalent. The codes will tell the truth about which part is or isn’t the issue. BTW what is the condition of your batteries? Without driving frequently, these cars will discharge a battery and release mayhem into the car. Like the one you are getting.

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