Check main circuit coolant level - AP20.30-P-2050EW

WARNING: This page does not describe the selected car, but rather 203 other vehicles, including the 2020 Mercedes-Benz SLC300, 2020 Mercedes-Benz SL550, 2020 Mercedes-Benz SL450, 2020 Mercedes-Benz S65 AMG, and 2020 Mercedes-Benz GLA250. However, it is still accessible from the selected car via links, so may be relevant.

ENGINE 111, 112, 113, 271, 272, 611, 612, 642, 646 in MODEL 203

ENGINE 156, 157, 271, 272, 273, 274, 276, 278, 642, 651 in MODEL 212

ENGINE 156, 157, 272, 273, 276, 278, 629, 642, 651 in MODEL 221

ENGINE 156, 157, 273, 278 in MODEL 216

ENGINE 156, 271, 272, 274, 276, 642, 646, 651 in MODEL 204

ENGINE 157, 274, 276, 278, 642, 651 in MODEL 218

ENGINE 271, 272, 273, 274, 276, 278, 642, 651 in MODEL 207

ENGINE 273, 629, 642 in MODEL 164.8

ENGINE 275 in MODEL 216, 221 Main circuit

Shown on model 204

Fig 1: Locating Coolant Expansion Reservoir Cap

Courtesy of MERCEDES-BENZ USA

	Remove
1	Switch off ignition
2	Open engine hood	MODEL 164.8, 203, 204, 207, 212, 216, 218, 221
	Open engine hood	MODEL 204.3, 207, 212 MODEL 204.3, 207, 212 with CODE U60 (Pedestrian protection) Moving the engine hood to the vertical position: Detach left and right clamping levers at the upper left and right hinges.	AR88.40-P-1000EW
	Risk of injury to skin and eyes suffering scalding from contact with hot coolantspray. Risk of poisoning from swallowing coolant.	Do not open cooling system unless coolant temperature is below 90 °C. Open cap slowly and release the pressure. Do not pour coolant into beverage containers. Wear protective gloves, protective clothing and safety glasses.	AS20.00-Z-0001-01A
3	Unscrew cap (1) for coolant expansion reservoir (2)		AS20.00-Z-0001-01A
	Check
4	Check coolant level
	Notes on coolant		AH20.00-N-2080-01
	Notes on coolant	The coolant level on a cold engine must reach up to the marking (arrow) in the coolant expansion reservoir. When the coolant is warm, about 1 cm above the marking (arrow). If coolant level is too low: ↓ Check coolant for leaktightness and check coolant for antifreeze content subject to separate repair order.	AH20.00-N-2080-01
	Install
5	Seal coolant expansion reservoir (2) with cap (1)
6	Close engine hood	MODEL 164.8, 203, 204, 207, 212, 216, 218, 221
	Close engine hood	MODEL 204.3, 207, 212 MODEL 204.3, 207, 212 with CODE U60 (Pedestrian protection) Close engine hood: Mount left and right clamping levers at the upper left and right hinges.	AR88.40-P-1000EW