Product Overview

The coolant expansion tank, OEM number A2045000049, is fitted across a wide range of Mercedes-Benz models sharing this cooling system component, including the C-Class (W204/S204/C204), E-Class (W212/C207/S212/A207), GLK-Class (X204), and CLS-Class (C218/X218), covering the 2007-2014 production run. Since this expansion tank spans so many closely related Mercedes-Benz platforms, it's a high-turnover part number worth stocking in volume for distributors serving Mercedes-Benz cooling system parts demand.

Worn or failing units typically show up as coolant leaks, steam or bubbling from the tank, an illuminated coolant warning light, or engine overheating from lost system pressure. GSK Auto manufactures this expansion tank to OEM specification at our Ningbo, China facility, with every unit tested before packing. We supply at wholesale volume with low MOQ and support private label packaging, with our team available to confirm fitment before shipping.

Replacement OEM Numbers

Cross-Reference OEM Number

2045000049, A2045000549, A2045000749, 2045000549, 2045000749

(Confirm against your VIN or chassis code before ordering — these are commonly listed cross-references for this application, not a guarantee of exact fitment for every variant.)

What Is a Coolant Expansion Tank?

Function: The coolant expansion tank stores excess coolant and accommodates its expansion and contraction as engine temperature changes, while also allowing trapped air to escape from the cooling system.

Working Principle: As coolant heats up and expands, it flows into the tank; as it cools and contracts, coolant is drawn back into the system. The tank cap maintains system pressure, which raises the coolant's boiling point and helps prevent overheating.

Importance: On a high-volume sedan, wagon, and crossover platform, a properly sealed and functioning expansion tank is essential for maintaining cooling system pressure and preventing overheating.

Common Failures & Signs: Cracked plastic causing coolant leaks, especially common as the tank ages. Loss of system pressure leading to overheating. Steam or coolant visible at the tank. Illuminated coolant level or temperature warning light.

Key Features

OEM-standard fitment - matches factory mounting and capacity specification for the A2045000049 application.

Durable construction - built to withstand sustained heat cycling and system pressure.

Excellent fitment - direct bolt-in replacement, no modification required.

Tested before shipment - every unit checked for proper seal and function before packing.

Reliable performance - restores factory cooling system pressure and reliability.

Benefits

Importers - covers coolant expansion tank demand across the C-Class, E-Class, GLK, and CLS from one part number.

Wholesalers - steady demand from Mercedes-Benz's highest-volume shared platforms.

Repair Shops - tested unit reduces comeback risk on cooling system repairs.

Distributors - private label packaging available for building a branded catalog.

End Customers - restored cooling system reliability and reduced overheating risk.

Packaging & Shipping

Standard export cartons. Customized packaging available for distributor branding. OEM-style and private label printing on request. Container loading handled directly, with mixed-SKU consolidation for smaller orders. Worldwide shipping to Europe, North America, South America, the Middle East, Africa, and Southeast Asia.

Frequently Asked Questions

• What does this expansion tank do?

It stores excess coolant, accommodates thermal expansion, and helps maintain cooling system pressure.

• Which vehicles use OEM A2045000049?

Mercedes-Benz C-Class (W204), E-Class (W212), GLK (X204), and CLS (C218), 2007-2014 — confirm exact trim and model year before ordering.

• Can GSK Auto supply OEM-standard parts?

Yes, this expansion tank is manufactured to match OEM specification for fitment and performance.

• What's the MOQ for wholesale orders?

MOQ varies by order type — contact us directly for current wholesale tiers.

• Do you export worldwide?

Yes, we ship to Europe, North America, South America, the Middle East, Africa, and Southeast Asia.

• Can you customize packaging?

Yes, OEM-style and private label printing are available.

• How do I know if my expansion tank needs replacing?

Common signs include coolant leaks, steam from the tank, overheating, or a coolant warning light.

Why Choose GSK Auto

GSK Auto manufactures factory-direct, keeping pricing tied to production cost. This expansion tank is built to OEM specification and tested before packing. We support low MOQ, private label packaging, and worldwide shipping, with our technical team available to confirm fitment before you order.

Call to Action

Sourcing coolant expansion tanks for the Mercedes-Benz C-Class, E-Class, GLK, or CLS? Contact GSK Auto for a wholesale quote, catalog, or OEM/private label cooperation.