Maintaining the coolant level is essential for preventing overheating and ensuring the engine runs efficiently in your Mercedes-Benz R107. Below is a step-by-step guide on how to check, refill, and maintain the coolant system properly.
Checking the Coolant Level
📌 Important: Always check coolant when the engine is cold to avoid burns from hot steam or fluid.
Step 1: Locate the Coolant Reservoir
✅ The coolant expansion tank is separate from the radiator.
✅ Ensure the vehicle is parked on level ground before checking.
Step 2: Check the Coolant Level
- Coolant reservoir cap
- Marking for coolant level
- When the coolant is cold → It should reach the marked level on the reservoir.
- When the coolant is hot → It should be approximately 2 cm (0.8 in) above the mark due to expansion.
🚨 If the coolant level is low, you must add coolant immediately to prevent overheating.
How to Add Coolant
📌 Use the Correct Coolant Mixture:
- Always use a 50/50 mixture of water and Mercedes-Benz (MB) anticorrosion/antifreeze coolant.
- This ensures optimal engine cooling and protection against corrosion and freezing.
PEAK OET Extended Life Blue 50/50 Prediluted Antifreeze/Coolant for European Vehicles, 1 Gal.
Step 1: Open the Coolant Reservoir Carefully
🚨 Warning:
- If the engine is above 90°C (194°F), DO NOT remove the cap!
- If you see steam or leaking coolant, wait for the engine to cool down completely.
Step 2: Relieve Pressure Before Fully Opening
✅ Using a rag, turn the cap slowly to the first notch—this allows pressure to escape.
✅ Once all excess pressure is released, carefully remove the cap.
Step 3: Add Coolant
✅ Pour the 50/50 coolant mix slowly into the reservoir until it reaches the correct level.
✅ Securely tighten the cap to prevent leaks.
Coolant Drain and Replacement
🔧 Coolant Drain Locations:
- Engine Drain Plugs: Located on both the right and left side of the engine.
- Radiator Drain Plug: Located at the bottom of the radiator.
When to Replace Coolant:
✅ Follow the manufacturer’s recommended coolant change intervals.
✅ If the coolant appears dirty or rust-colored, flush and replace it immediately.
Coolant System Safety Warnings
🚨 Never open the coolant reservoir when the engine is hot—this can result in serious burns from steam and hot fluid.
🚨 Always dispose of old coolant properly—it is toxic to humans and animals.
🚨 Use only recommended Mercedes-Benz coolant—mixing different brands may cause engine damage.
PEAK OET Extended Life Blue 50/50 Prediluted Antifreeze/Coolant for European Vehicles, 1 Gal.
Final Tips for Coolant System Maintenance
✅ Regularly check the coolant level to prevent overheating.
✅ Inspect for leaks under the vehicle or around hoses and the radiator.
✅ Monitor engine temperature—if the temperature gauge rises abnormally, check the coolant system immediately.
By following these simple steps, you can keep your Mercedes-Benz R107 running cool and performing optimally! 🚗❄️
