Engine Coolant Thermostat for Mercedes-Benz ⚙️

This engine coolant thermostat is a key temperature control part in the Mercedes cooling system. It helps the engine warm up fast, then keeps coolant flow steady when the motor reaches working temperature. A good thermostat supports fuel economy, cabin heater performance, smooth running, and long engine life.

Why This Part Is Needed ?️

The engine must not run too cold or too hot. When cold, the thermostat stays closed to help the engine reach the correct temperature quickly. When hot, it opens and lets coolant move through the radiator. This simple action protects the cylinder heads, gaskets, water pump, radiator, and electronic sensors from heat stress.

How It Works ?

Inside the thermostat is a heat-sensitive valve. As coolant temperature rises, the valve opens in a controlled way. When temperature drops, it closes again. This keeps the engine in the best operating range during city driving, highway use, towing, and cold starts.

What Happens If It Fails ⚠️

A stuck closed thermostat can cause overheating, coolant pressure rise, warning lights, and possible engine damage. A stuck open thermostat may cause slow warm-up, weak heater output, high fuel use, rough idle, and poor emissions. Replacement is recommended when temperature readings become unstable or coolant service is performed.

Compatible Models

• E 400 4Matic
• S 400 4-Matic
• S 400 4-Matic Maybach
• Gle 320 4Matic
• Gl/Gls 450 4Matic
• Ml/Gle 400
• C 400 4Matic
• S 350
• Sl 400
• C 450 Amg Sport 4Matic
• Cls 400 4Matic
• Ml/Gle 400 4Matic
• Amg Glc 43 4Matic
• Gl/Gls 400 4Matic
• R 320 4Matic
• Amg C 43 4Matic
• E 400 L
• E 450 4Matic
• Gle 400 4Matic
• E 450
• S 450 4-Matic
• E 400
• E 400 L 4Matic
• S 560E
• S 450
• Ml/Gle 450 Sport Amg 4Matic
• E 320 Blue Efficiency
• Amg E43 4Matic
• Cls 400
• S 400
• S 400/S 450 4-Matic
• E 320 L 4Matic
• S 320
• E 400 4Matic Blue Efficiency
• R 400 4Matic
• Cls 320
• E 320 L
• E 350 Blue Efficiency
• E 400 Blue Efficiency
• S 500 Plug-In Hybrid/E
• Ml/Gle 500 4Matic Hybrid/E
• Gls 320 4Matic
• Ml/Gle 320 4Matic
• Gle 43 4Matic
• Amg Slc 43