Checking Coolant Level in your Turbo Diesel Mercedes W123

Next to oil, coolant is the most important fluid for the health of your engine. Running low on coolant can lead to serious engine damage if it overheats. Learn to check it, and check it often, to ensure you're keeping your cool.

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

Edit Step 1 Checking Coolant Level in your Turbo Diesel Mercedes W123  ¶ 

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Edit Step 1 Checking Coolant Level in your Turbo Diesel Mercedes W123  ¶ 

  • 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.

Edit Step 2  ¶ 

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Edit Step 2  ¶ 

  • 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.

Edit Step 3  ¶ 

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Edit Step 3  ¶ 

  • 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.

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

For more information, check out the Mercedes W123 device page.

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