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This guide applies to later style turbo diesel engines that have a translucent plastic overflow tank for observing coolant level.

  1. How to check the coolant level in your Turbo Diesel Mercedes W123, How to check the coolant level in your Turbo Diesel Mercedes W123: step 1, image 1 of 1
    • Checking coolant level is simple of the turbo diesel cars because of the translucent overflow tank.

    • Find the tank, it will be on the passenger's side under the hood forward of the battery.

  2. How to check the coolant level in your Turbo Diesel Mercedes W123: step 2, image 1 of 1
    • Now get down low and have a look at the front of the tank.

    • Note the arrow that points to a line at about the mid-point of the tank. This is the level the coolant should be at.

  3. How to check the coolant level in your Turbo Diesel Mercedes W123: step 3, image 1 of 1
    • If your coolant is low, top it off with a mix of about 50/50 distilled water to coolant. Only use a proper coolant for these cars, either the Genuine Mercedes coolant or one that is specified and formulated for the application.

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If your coolant is low, top it off only when the engine is cool!

Nicolas Siemsen

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It's also a good idea to check the color of the coolant. Very dark or sooty coolant may indicate engine oil is getting mixed into the coolant due to a blown head gasket, or more seriously, cracks in the engine block.

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