Check Low-Temperature Circuit Coolant Level - AP20.30-P-2052L

WARNING: This page is about a different car, the 2023 Mercedes-Benz GLC300, 2022 Mercedes-Benz GLC300, 2021 Mercedes-Benz GLC300, 2020 Mercedes-Benz GLC350e, and 2020 Mercedes-Benz GLC300. However, it is still accessible from the selected car via links, so may be relevant.

Engine 274 in model 172, 205, 253

Shown on engine 274.9 in model 253.3

Courtesy of MERCEDES-BENZ USA

	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 overpressure. Do not pour coolant into beverage containers. Wear protective gloves, protective clothing and safety glasses.	AS20.00-Z-0001-01A
Notice	Notes on coolant		AH20.00-P-2080-01KOA
	Remove
1	Unscrew cap (1) from coolant expansion reservoir for low-temperature circuit (2).
	Check
2	Check coolant level.	With a cold engine, the coolant level must reach the marking (arrow) in the low-temperature circuit coolant expansion reservoir (2). When the coolant is warm: approx. 1 cm (0.39 inch) above the marking. If the coolant level is too low, ↓ Check Cooling system for leak tightness and coolant for antifreeze content.
		Coolant specifications	BB00.40-P-0310-01A
		After obtaining special order.
	Install
3	Seal coolant expansion reservoir for low-temperature circuit (2) with cap (1).