URO Parts Expansion Tank/Coolant Reservoir | 2045000949

Mercedes E550, CLS550, C63 AMG, E63 AMG, E63 AMG S, G63 AMG, G550, C63 AMG S, CLS63 AMG, CLS63 AMG S & more
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P/N: 2045000949 URO Parts
Cross References:
  • 2045000149
  • 2045000449
  • 2045000649
  • CRT213000S
  • URO015655

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.

Uro Parts, manufactured by APA Industries, is a quality line of aftermarket replacement parts for import vehicles. The Uro line has been OE factory approved on a number of parts for Jaguar and Mercedes while continuing to work on even more OE approvals. APA conducts extensive quality, fitment, and lifecycle testing in-house to assure customer satisfaction that the parts will exceed your expectations. Their engineers also work with manufacturers to design improvements and build better than OE products on those parts that had issues from the original manufacturer on the vehicles. Uro Parts is always striving to build the best available part at the most affordable price.
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.

Frequently Viewed Together

We found 7 additional part(s) that are frequently viewed together.

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What This URO Parts 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.

17-21 - AMG GT
For cars with (Code 805, 806, or 807). Body Type: Coupe
16-19 - AMG GT S
For cars with (Code 805, 806, or 807).
08-15 - C63 AMG Base, Black Series
16-21 - C63 AMG
15-21 - C63 AMG S
12-18 - CLS550 Base, 4Matic
Radiator ~ Not for cars with Additonal Warm Water Heating (Code 228).
14-14 - CLS63 AMG 4Matic
12-13 - CLS63 AMG
14-18 - CLS63 AMG S 4Matic
10-11 - E550 Base, 4Matic
12-14 - E550 4Matic
Not for cars with (Code 228, 804, 805, or 806).
12-17 - E550
Not for cars with (Code 228, 804, or 805).
10-15 - E63 AMG Base, 4Matic
14-16 - E63 AMG S 4Matic
14-18 - G550
12-13 - G550
from chassis # X 204078 from 11/01/12
17-18 - G550 4x4
14-18 - G63 AMG
13-13 - G63 AMG
For cars with (Code XZ2).
16-18 - G65 AMG