Mahle Behr Expansion Tank/Coolant Reservoir | 2225000849

Mercedes S550, S600, S63 AMG, S560, S65 AMG, Maybach S600, Maybach S650, Maybach S550, Maybach S560
$71.99
Reg
$74.99
List
$145.00
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Make Sure It Fits

P/N: 2225000849 Mahle Behr FREE SHIPPING
Cross References:
  • CRT139000S

The expansion tank is the reservoir that holds excess coolant until needed by the engine and allows for the expansion and contraction of coolant as it heats up and cools down.

Expansion tanks are often the highest point in the cooling system of your Mercedes, whether attached to the radiator or set apart in the engine compartment and connected to the cooling system using a hose. This placement allows any air trapped in the cooling system to be pushed into the expansion tank, where it can escape, and allows coolant to be added to the cooling system without allowing air to enter.

Detecting a Faulty Expansion Tank

Expansion tanks fail when they can no longer hold enough air pressure to prevent the cooling system from overflowing or when they can no longer hold coolant. Expansion tanks that are not holding pressure allow the cooling pressure to release, lowering the coolant's boiling point and allowing the coolant to expand and aerate and the engine to overheat. Expansion tanks that are leaking coolant allow air to enter the cooling system instead of coolant, causing engine overheating. Steam coming from the expansion tank or coolant dripping from the expansion tank are signs that it has failed.

Failed expansion tank caps can mimic an expansion tank that does not hold pressure. Checking the expansion tank cap and replacing it may solve the problem of an expansion tank not maintaining pressure.

Replacing Your Mercedes Expansion Tank

Replacing an expansion tank is usually simple. With the exception of expansion tanks mounted to the radiator, crimping the hose from the expansion tank to the cooling system will allow you to unbolt, remove, and replace the expansion tank without draining and refilling the cooling system.

View more Mercedes Expansion Tanks.

Left = Driver side and Right = Passenger side.
All parts are priced individually unless identified as a set or kit. "Per car" notes identify how many of a given part your car has and "Left/Right or Front/Rear" notes means the part fits the left or right side of the car. These parts are still sold individually and you'll need to select the appropriate quantity if you plan to replace more than one of this item.

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What This Mahle Behr Expansion Tank/Coolant Reservoir Fits?

Application information below is for reference only and should not be used to determine the exact vehicle fitment. Please use the "Make Sure It Fits" vehicle selection box above to determine the exact fitment and review any application notes. If you need any help determining if this part works with your vehicle, please don't hesitate to contact us.

Mercedes
17-17 - Maybach S550 4Matic
Radiator
18-20 - Maybach S560 4Matic
Radiator
16-17 - Maybach S600
Radiator
18-20 - Maybach S650
Radiator
14-17 - S550 Base, 4Matic
Radiator
18-21 - S560 Base, 4Matic
Radiator
15-17 - S600
Radiator
14-17 - S63 AMG
Radiator
15-20 - S65 AMG
Radiator