Remove/Install Expansion Reservoir - AR20.30-P-4950LW

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 264, 274.9, 276.8, 642, 651, 654, 656 in model 253

Engine 264, 274.9, 276.8, 651, 654 in model 205

Fig 1: Coolant Expansion Reservoir Components Location - Engine 264; 274.9 In Model 253

Courtesy of MERCEDES-BENZ USA

Shown on engine 651 in model 205 (except 205.012/212)

Shown on engine 654 in model 205

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
	Risk of injury caused by scraping or cutting body parts on sharp vehicle parts	Always wear protective gloves when working on or near sharp and non-deburred vehicle parts. Deburr repair panels.	AS00.00-Z-0017-01A
Notice	Notes on avoiding damage through contamination and foreign objects		AH00.00-P-5000-01A
Notice	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
Notice	Notes on coolant		AH20.00-P-2080-01KOA
	Notes on coolant level		AH20.00-P-1142-01CW
	Remove/install
1	Release and disconnect electrical connector from DPF differential pressure sensor (B28/8).	Engine 654 in model 205 except code 926 (Exhaust gas cleaning with Euro 4 technology) Engine 654, 656 in model 253 except code 926 (Exhaust gas cleaning with Euro 4 technology) except code 9O1 (Fuel cell pre-installation)
2	Remove heat shield (8) from expansion reservoir (2).	Engine 654 in model 205 Engine 654, 656 in model 253
3	Carefully unscrew cap (1).
4	Suction off coolant from the expansion reservoir (2) and capture coolant in a suitable container.	Hand pump	Fig 2
5	Remove bleed line (3) from expansion reservoir (2).		AR20.20-P-7441-01RQ
6	Unclip expansion reservoir (2) from rubber guides (4) and front guide.
7	Remove electric lines (5) from expansion reservoir (2).
8	Release and disconnect electrical connector (7).
9	Remove coolant hose (6) from expansion reservoir (2) and seal openings using suitable protective covers.		AR20.20-P-7441-01RQ
		Set of protective caps	Fig 3
10	Remove expansion reservoir (2).
	Check
11	Check rubber guides (4) for wear and damage.	If damage or wear are present, ↓ replace rubber guides (4).
12	Install in the reverse order.
13	Check engine Cooling system for leak tightness.		AR20.00-P-1010LW

Fig 2: Identifying Hand Pump (210 589 00 71 00)

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Set Of Protective Caps (001 589 00 91 00)

Courtesy of MERCEDES-BENZ USA