How to Check Coolant Level

Adding antifreeze to a car

Even before you learn how to check coolant levels, you may be wondering, “what is coolant?” Coolant, also called antifreeze, is a liquid that pulls heat away from your car’s engine, regulating the temperature of the engine block and other vital parts. Engine coolant is crucial no matter the make or model and no matter if you have a new or used car. Coolant keeps your engine cool during San Marcos warm weather and prevents it from freezing during San Diego winter months. Learn more about what coolant is, how to check coolant levels, and when to change it in this guide from Mercedes-Benz of Escondido!


Coolant Levels: What to Look for

To check coolant levels, you don’t have to open the radiator cap; check the markings on the side of the reservoir. If the coolant reaches the “full” mark, you’re okay. If it doesn’t, remove the radiator cap and add the coolant or a 50/50 mix of coolant and water. Check the coolant bottle to see if it’s already premixed. Also, when you add coolant to the cooling system, be sure the engine has cooled off and never open the radiator cap while the engine is hot.


When to See a Service Technician 

Typically, coolant is thicker than water but thinner than oil. If your coolant appears sludgy, schedule a service appointment immediately. Sludgy coolant indicates your car has an internal gasket leak. Driving around Escondido is possible, but a leaky gasket will drain the coolant quickly, meaning your engine is at risk of overheating and being critically damaged.


When to Change Coolant

Checking on your coolant levels every three to six months is ideal since coolant levels lower over time. Usually, the liquid is blue, green, or yellow; if it appears brown or colorless, flush the system and replace the fluid.


Get More Service Tips from Mercedes-Benz of Escondido!

If you have any more questions about how to check coolant levels, or if you need advice on other common car maintenance or service tips, like when to replace a car battery or how to check car oil, don’t hesitate to contact us at Mercedes-Benz of Escondido!


Service Specials at Mercedes-Benz of Escondido

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Please present this coupon to your service advisor at the time of write-up. Cannot be used with other discounts or specials. Price is plus tax and hazardous disposal fee. Not valid on service previously performed. Does not include Maybachs, SLR, SLS, or S560 vehicles. Does not include tires. Other restrictions may apply. See your service advisor for complete details. Void where prohibited. Valid only at Mercedes-Benz of Escondido. Max $500 Limit. Expires 4/30/2021.

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  • Brake Component Inspection
  • Reset Maintenance Counter
  • All Fluid Level Checks and Corrections Are Dependent On Factory-Recommended Service Intervals For Your Vehicle’s Year and Model

Includes:

  • Complimentary car wash & Bio-disinfectant which kills 98% of germs

Dealer-Recommendations:

  • Complete undercarriage inspection
  • Add new washer solution into washer reservoir
  • Perform Medtronics test on battery
  • Road test
  • Vehicle wash with interior vacuum

 

 

 

Must present offer when your service order is written for offer to apply. Valid at Mercedes-Benz of Escondido. Service wait time may vary depending on the services requested. 2009 and newer Mercedes-Benz vehicles only. Please refer to your maintenance booklet for the complete list of factory-required services and details on the specific intervals for your vehicle's year and model. Cannot be combined with any other offer or applied to past services. Does not include applicable taxes, shop supplies, and hazardous waste fees. Excludes AMG®, Maybach, GTS, GT, SLR, Diesel, Electric, smart, Sprinter vehicles. Limit one original offer per person. Other restrictions may apply. Void where prohibited. See Dealer for details. Expires 4/30/2021.

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1101 West Ninth Ave • Escondido, CA 92025

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