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ES#5504936 - 2045000949KT1 - Coolant Expansion Tank Replacement Kit - Refresh your cooling system! Includes a new expansion tank, pressure cap, and 1-liter of blue coolant. - Assembled By ECS - Mercedes Benz

Coolant Expansion Tank Replacement Kit

Refresh your cooling system! Includes a new expansion tank, pressure cap, and 1-liter of blue coolant.
10X Entries For Our 25th Anniversary Sweepstakes!
Assembled By ECS
Mfg Part #
2045000949KT1 2045000949KT1
ECS Part #
ES#5504936
Brand
Assembled By ECS

89.99
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on orders $49 and up
This product is lifetime replacement eligible Partial Replacement
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Product Details

10X Entries For Our 25th Anniversary Sweepstakes!

Restore the integrity of your high-performance Mercedes-Benz cooling system and prevent catastrophic overheating with this comprehensive coolant expansion tank replacement kit.

The engine coolant reservoir is a crucial component that captures the increased volume of engine coolant as it heats up and expands. Positioned in the engine bay, this tank is subjected to thousands of intense heat cycles from below freezing temperatures to over 200 degrees Fahrenheit. Over time, the clear factory plastic becomes foggy, opaque, and extremely brittle. The most common failure point is the molded plastic seam, which can crack and lead to total instantaneous failure or slow leaks. A bad expansion tank can reduce the cooling system's pressure, lower the coolant's boiling point, and ultimately cause engine overheating.

When replacing a cracked or leaking tank, installing a fresh pressure cap is highly recommended to ensure the system can hold proper pressure.

This curated kit takes the guesswork out of cooling system maintenance. It includes a brand-new expansion tank, a fresh pressure-rated cap, and a 1-liter bottle of factory-spec blue coolant to correctly top off the system and bleed out any air pockets.

Kit Contents:

This complete reservoir kit includes the following replacement components:

  • (1) Coolant Expansion Tank / Reservoir: Replaces Part# 2045000949 (Also replaces earlier supersessions 2045000149, 2045000449, and 2045000649)

  • (1) Expansion Tank Pressure Cap: Replaces Part# 2105010615

  • (1) 1-Liter Coolant/Antifreeze (Blue): (Mercedes-Benz Spec 325.0 / 326.0 required for topping off the system post-installation)

This Part Fits the Following Vehicles

Make Model Submodel Engine Year Chasis Special Fitment Notes
Mercedes Benz AMG GT Base M178.980 2016 190.377 For cars with (Code 805, 806, or 807).
Mercedes Benz AMG GT Base V8 4.0L 2017 190.377 For cars with (Code 805, 806, or 807).
Mercedes Benz AMG GT Base V8 4.0L 2018 190.377 For cars with (Code 805, 806, or 807).
Mercedes Benz AMG GT Base V8 4.0L 2018 190.477 For cars with (Code 805, 806, or 807).
Mercedes Benz AMG GT Base V8 4.0L 178.980 2019 190.377 For cars with (Code 805, 806, or 807).
Mercedes Benz AMG GT Base V8 4.0L 178.980 2019 190.477 For cars with (Code 805, 806, or 807).
Mercedes Benz AMG GT Base V8 4.0L 178.980 2020 190.377 For cars with (Code 805, 806, or 807).
Mercedes Benz AMG GT Base V8 4.0L 178.980 2020 190.477 For cars with (Code 805, 806, or 807).
Mercedes Benz AMG GT Base V8 4.0L 178.980 2021 190.377 For cars with (Code 805, 806, or 807).
Mercedes Benz AMG GT Base V8 4.0L 178.980 2021 190.477 For cars with (Code 805, 806, or 807).
Mercedes Benz AMG GT S M178.980 2016 190.378 For cars with (Code 805, 806, or 807).
Mercedes Benz AMG GT Black Base V8 4.0L 178.980 2021 190.381 For cars with (Code 805, 806, or 807).
Mercedes Benz AMG GT S Base V8 4.0L 2016 190.378 For cars with (Code 805, 806, or 807).
Mercedes Benz AMG GT S Base V8 4.0L 2017 190.378 For cars with (Code 805, 806, or 807).
Mercedes Benz AMG GT S Base V8 4.0L 2018 190.378 For cars with (Code 805, 806, or 807).
Mercedes Benz AMG GT S Base V8 4.0L 178.980 2019 190.378 For cars with (Code 805, 806, or 807).
Mercedes Benz C63 AMG Base V8 4.0L 2016 205.086 For Radiator
Mercedes Benz C63 AMG Base V8 4.0L 2017 205.086 For Radiator
Mercedes Benz C63 AMG Base V8 4.0L 2017 205.386 For Radiator
Mercedes Benz C63 AMG Base V8 4.0L 2017 205.486 For Radiator
Mercedes Benz C63 AMG Base V8 4.0L 2018 205.086 For Radiator
Mercedes Benz C63 AMG Base V8 4.0L 2018 205.386 For Radiator
Mercedes Benz C63 AMG Base V8 4.0L 2018 205.486 For Radiator
Mercedes Benz C63 AMG Base V8 4.0L 177.980 2019 205.086 For Radiator
Mercedes Benz C63 AMG Base V8 4.0L 177.980 2019 205.386 For Radiator
Mercedes Benz C63 AMG Base V8 4.0L 177.980 2019 205.486 For Radiator
Mercedes Benz C63 AMG Base V8 4.0L 177.980 2020 205.086 For Radiator
Mercedes Benz C63 AMG Base V8 4.0L 177.980 2020 205.386 For Radiator
Mercedes Benz C63 AMG Base V8 4.0L 177.980 2020 205.486 For Radiator
Mercedes Benz C63 AMG Base V8 4.0L 177.980 2021 205.086 For Radiator
Mercedes Benz C63 AMG Base V8 4.0L 177.980 2021 205.386 For Radiator
Mercedes Benz C63 AMG Base V8 4.0L 177.980 2021 205.486 For Radiator
Mercedes Benz C63 AMG Base V8 6.3L 2015 204.077 Use vehicle selector to confirm fitment
Mercedes Benz C63 AMG Base V8 6.3L 156.985 2008 204.077 Use vehicle selector to confirm fitment
Mercedes Benz C63 AMG Base V8 6.3L 156.985 2009 204.077 Use vehicle selector to confirm fitment
Mercedes Benz C63 AMG Base V8 6.3L 156.985 2010 204.077 Use vehicle selector to confirm fitment
Mercedes Benz C63 AMG Base V8 6.3L 156.985 2011 204.077 Use vehicle selector to confirm fitment
Mercedes Benz C63 AMG Base V8 6.3L 156.985 2012 204.077 Use vehicle selector to confirm fitment
Mercedes Benz C63 AMG Base V8 6.3L 156.985 2012 204.377 Use vehicle selector to confirm fitment
Mercedes Benz C63 AMG Base V8 6.3L 156.985 2013 204.077 Use vehicle selector to confirm fitment
Mercedes Benz C63 AMG Base V8 6.3L 156.985 2013 204.377 Use vehicle selector to confirm fitment
Mercedes Benz C63 AMG Base V8 6.3L 156.985 2014 204.077 Use vehicle selector to confirm fitment
Mercedes Benz C63 AMG Base V8 6.3L 156.985 2014 204.377 Use vehicle selector to confirm fitment
Mercedes Benz C63 AMG Edition 507 V8 6.3L 2015 204.377 Use vehicle selector to confirm fitment
Mercedes Benz C63 AMG S Base V8 4.0L 2015 205.087 For Radiator
Mercedes Benz C63 AMG S Base V8 4.0L 2016 205.087 For Radiator
Mercedes Benz C63 AMG S Base V8 4.0L 2017 205.087 For Radiator
Mercedes Benz C63 AMG S Base V8 4.0L 2017 205.387 For Radiator
Mercedes Benz C63 AMG S Base V8 4.0L 2017 205.487 For Radiator
Mercedes Benz C63 AMG S Base V8 4.0L 2018 205.087 For Radiator
Mercedes Benz C63 AMG S Base V8 4.0L 2018 205.387 For Radiator
Mercedes Benz C63 AMG S Base V8 4.0L 2018 205.487 For Radiator
Mercedes Benz C63 AMG S Base V8 4.0L 177.980 2019 205.087 For Radiator
Mercedes Benz C63 AMG S Base V8 4.0L 177.980 2019 205.387 For Radiator
Mercedes Benz C63 AMG S Base V8 4.0L 177.980 2019 205.487 For Radiator
Mercedes Benz C63 AMG S Base V8 4.0L 177.980 2020 205.087 For Radiator
Mercedes Benz C63 AMG S Base V8 4.0L 177.980 2020 205.387 For Radiator
Mercedes Benz C63 AMG S Base V8 4.0L 177.980 2020 205.487 For Radiator
Mercedes Benz C63 AMG S Base V8 4.0L 177.980 2021 205.087 For Radiator
Mercedes Benz C63 AMG S Base V8 4.0L 177.980 2021 205.387 For Radiator
Mercedes Benz C63 AMG S Base V8 4.0L 177.980 2021 205.487 For Radiator
Mercedes Benz C63 AMG S Base V8 4.0L 177.980 2023 205.387 For Radiator
Mercedes Benz C63 AMG S Base V8 4.0L 177.980 2023 205.487 For Radiator
Mercedes Benz CLS550 4Matic V8 4.6L 2015 218.391 Not for cars with Additonal Warm Water Heating (Code 228).
Mercedes Benz CLS550 4Matic V8 4.6L 2016 218.391 Not for cars with Additonal Warm Water Heating (Code 228).
Mercedes Benz CLS550 4Matic V8 4.6L 2017 218.391 Not for cars with Additonal Warm Water Heating (Code 228).
Mercedes Benz CLS550 4Matic V8 4.6L 2018 218.391 Not for cars with Additonal Warm Water Heating (Code 228).
Mercedes Benz CLS550 4Matic V8 4.6L 278.922 2012 218.391 Not for cars with Additonal Warm Water Heating (Code 228).
Mercedes Benz CLS550 4Matic V8 4.6L 278.922 2013 218.391 Not for cars with Additonal Warm Water Heating (Code 228).
Mercedes Benz CLS550 4Matic V8 4.6L 278.922 2014 218.391 Not for cars with Additonal Warm Water Heating (Code 228).
Mercedes Benz CLS550 Base V8 4.6L 2015 218.373 Not for cars with Additonal Warm Water Heating (Code 228).
Mercedes Benz CLS550 Base V8 4.6L 2016 218.373 Not for cars with Additonal Warm Water Heating (Code 228).
Mercedes Benz CLS550 Base V8 4.6L 2017 218.373 Not for cars with Additonal Warm Water Heating (Code 228).
Mercedes Benz CLS550 Base V8 4.6L 2018 218.373 Not for cars with Additonal Warm Water Heating (Code 228).
Mercedes Benz CLS550 Base V8 4.6L 278.922 2012 218.373 Not for cars with Additonal Warm Water Heating (Code 228).
Mercedes Benz CLS550 Base V8 4.6L 278.922 2013 218.373 Not for cars with Additonal Warm Water Heating (Code 228).
Mercedes Benz CLS550 Base V8 4.6L 278.922 2014 218.373 Not for cars with Additonal Warm Water Heating (Code 228).
Mercedes Benz CLS63 AMG 4Matic V8 5.5L 157.981 2014 218.392 For Radiator
Mercedes Benz CLS63 AMG 4Matic S-Model V8 5.5L 157.981 2014 218.376 For Radiator
Mercedes Benz CLS63 AMG Base V8 5.5L 157.981 2012 218.374 For Radiator
Mercedes Benz CLS63 AMG Base V8 5.5L 157.981 2013 218.374 For Radiator
Mercedes Benz CLS63 AMG S 4Matic V8 5.5L 2015 218.376 For Radiator
Mercedes Benz CLS63 AMG S 4Matic V8 5.5L 2016 218.376 For Radiator
Mercedes Benz CLS63 AMG S 4Matic V8 5.5L 2017 218.376 For Radiator
Mercedes Benz CLS63 AMG S 4Matic V8 5.5L 2018 218.376 For Radiator
Mercedes Benz E550 4Matic V8 4.6L 2016 212.091 Not for cars with (Code 228, 804, or 805).
Mercedes Benz E550 4Matic V8 4.6L 278.922 2012 212.091 Not for cars with (Code 228, 804, or 805).
Mercedes Benz E550 4Matic V8 4.6L 278.922 2013 212.091 Not for cars with (Code 228, 804, or 805).
Mercedes Benz E550 4Matic V8 4.6L 278.922 2014 212.091 Not for cars with (Code 228, 804, or 805).
Mercedes Benz E550 4Matic V8 5.5L 273.970 2010 212.090 Not for cars with (Code 228, 804, or 805).
Mercedes Benz E550 4Matic V8 5.5L 273.970 2011 212.090 Not for cars with (Code 228, 804, or 805).
Mercedes Benz E550 Base V8 4.6L 2015 207.373 Not for cars with (Code 228, 804, or 805).
Mercedes Benz E550 Base V8 4.6L 2015 207.473 Not for cars with (Code 228, 804, or 805).
Mercedes Benz E550 Base V8 4.6L 2016 207.373 Not for cars with (Code 228, 804, or 805).
Mercedes Benz E550 Base V8 4.6L 2016 207.473 Not for cars with (Code 228, 804, or 805).
Mercedes Benz E550 Base V8 4.6L 2017 207.373 Not for cars with (Code 228, 804, or 805).
Mercedes Benz E550 Base V8 4.6L 2017 207.473 Not for cars with (Code 228, 804, or 805).
Mercedes Benz E550 Base V8 4.6L 278.922 2012 207.373 Not for cars with (Code 228, 804, or 805).
Mercedes Benz E550 Base V8 4.6L 278.922 2012 207.473 Not for cars with (Code 228, 804, or 805).
Mercedes Benz E550 Base V8 4.6L 278.922 2013 207.373 Not for cars with (Code 228, 804, or 805).
Mercedes Benz E550 Base V8 4.6L 278.922 2013 207.473 Not for cars with (Code 228, 804, or 805).
Mercedes Benz E550 Base V8 4.6L 278.922 2014 207.373 Not for cars with (Code 228, 804, or 805).
Mercedes Benz E550 Base V8 4.6L 278.922 2014 207.473 Not for cars with (Code 228, 804, or 805).
Mercedes Benz E550 Base V8 5.5L 273.966 2010 207.372 Not for cars with (Code 228, 804, or 805).
Mercedes Benz E550 Base V8 5.5L 273.966 2011 207.372 Not for cars with (Code 228, 804, or 805).
Mercedes Benz E550 Base V8 5.5L 273.966 2011 207.472 Not for cars with (Code 228, 804, or 805).
Mercedes Benz E550 Base V8 5.5L 273.966 2011 212.072 Not for cars with (Code 228, 804, or 805).
Mercedes Benz E550 Base V8 5.5L 273.971 2010 212.072 Not for cars with (Code 228, 804, or 805).
Mercedes Benz E550 Base V8 5.5L 273.971 2011 207.372 Not for cars with (Code 228, 804, or 805).
Mercedes Benz E550 Base V8 5.5L 273.971 2011 207.472 Not for cars with (Code 228, 804, or 805).
Mercedes Benz E550 Base V8 5.5L 273.971 2011 212.072 Not for cars with (Code 228, 804, or 805).
Mercedes Benz E63 AMG 4Matic V8 5.5L 2015 212.092 Use vehicle selector to confirm fitment
Mercedes Benz E63 AMG 4Matic V8 5.5L 157.981 2014 212.092 Use vehicle selector to confirm fitment
Mercedes Benz E63 AMG 4Matic S-Model V8 5.5L 157.981 2014 212.076 Use vehicle selector to confirm fitment
Mercedes Benz E63 AMG 4Matic S-Model V8 5.5L 157.981 2014 212.276 Use vehicle selector to confirm fitment
Mercedes Benz E63 AMG Base V8 5.5L 157.981 2012 212.074 Use vehicle selector to confirm fitment
Mercedes Benz E63 AMG Base V8 5.5L 157.981 2012 212.274 Use vehicle selector to confirm fitment
Mercedes Benz E63 AMG Base V8 5.5L 157.981 2013 212.074 Use vehicle selector to confirm fitment
Mercedes Benz E63 AMG Base V8 5.5L 157.981 2013 212.274 Use vehicle selector to confirm fitment
Mercedes Benz E63 AMG Base V8 6.3L 156.985 2010 212.077 Use vehicle selector to confirm fitment
Mercedes Benz E63 AMG Base V8 6.3L 156.985 2011 212.077 Use vehicle selector to confirm fitment
Mercedes Benz E63 AMG S 4Matic V8 5.5L 2015 212.076 Use vehicle selector to confirm fitment
Mercedes Benz E63 AMG S 4Matic V8 5.5L 2015 212.276 Use vehicle selector to confirm fitment
Mercedes Benz E63 AMG S 4Matic V8 5.5L 2016 212.076 Use vehicle selector to confirm fitment
Mercedes Benz E63 AMG S 4Matic V8 5.5L 2016 212.276 Use vehicle selector to confirm fitment
Mercedes Benz G550 4Matic V8 5.5L 273.963 2014 463.237 Use vehicle selector to confirm fitment
Mercedes Benz G550 Base V8 4.0L 2017 463.239 Use vehicle selector to confirm fitment
Mercedes Benz G550 Base V8 4.0L 2018 463.239 Use vehicle selector to confirm fitment
Mercedes Benz G550 Base V8 5.5L 2015 463.237 Use vehicle selector to confirm fitment
Mercedes Benz G550 Base V8 5.5L 2016 463.239 Use vehicle selector to confirm fitment
Mercedes Benz G550 Base V8 5.5L 273.963 2012 463.237 Use vehicle selector to confirm fitment
Mercedes Benz G550 Base V8 5.5L 273.963 2013 463.237 Use vehicle selector to confirm fitment
Mercedes Benz G550 4x4 Base V8 4.0L 2018 463.255 Use vehicle selector to confirm fitment
Mercedes Benz G63 AMG 4Matic V8 5.5L 2017 463.273 Use vehicle selector to confirm fitment
Mercedes Benz G63 AMG Base V8 5.5L 2015 463.273 Use vehicle selector to confirm fitment
Mercedes Benz G63 AMG Base V8 5.5L 2016 463.273 Use vehicle selector to confirm fitment
Mercedes Benz G63 AMG Base V8 5.5L 2018 463.273 Use vehicle selector to confirm fitment
Mercedes Benz G63 AMG Base V8 5.5L 157.984 2014 463.273 Use vehicle selector to confirm fitment
Mercedes Benz G65 AMG 4Matic V12 6.0L 2017 463.275 Use vehicle selector to confirm fitment
Mercedes Benz G65 AMG Base V12 6.0L 2016 463.275 Use vehicle selector to confirm fitment
Mercedes Benz G65 AMG Base V12 6.0L 2018 463.275 Use vehicle selector to confirm fitment
*The above product applications have been written by ECS Tuning. All warranties, product application, fitment, and performance are the responsibility of ECS Tuning. For additional information see the terms of use.

Some kit components are covered by our Lifetime Replacement Program

Products protected by our Lifetime Replacement Program are covered for as long as you own the product, no need to worry about an expiration date. Purchase your products and enjoy some worry-free motoring, knowing we've got you covered.

If you have any questions, would like to learn more or are ready to place a replacement claim, click here!

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Return and Exchanges

Need to set up a return? Click here to begin: Return Process

All you need is your order number and email address.


New/Unused Product Returns

ECS Tuning will accept returns for unused products within 90 days of the ship date for a refund to the original payment method used. The customer is responsible for the return shipping costs and fees. If selecting to use a prepaid shipping label, the shipping cost will be deducted from the total refunded amount. All new/unused products must be new, unused and must be in the original packaging, including labeling, manuals, hardware, etc. Special order parts are non-refundable.

In the event that we find an error on our website or on behalf of an ECS Tuning Representative, we will provide a return shipping label from the original delivery location.

Refused Packages

Any domestic orders that are returned to ECS Tuning as refused by receiver or non-deliverable will be subject to a return handling fee and will be processed as a return in compliance with our standard return policy, including a 15% restocking fee.

Any international orders that are refused at the time of delivery will be subject to carrier abandonment of the package, at which time the ordered products would be discarded by the carrier. The customer will not be refunded for the value of the order and the discarded products are no longer retrievable.

Return Process

Return Process

ECS Tuning now offers an online returns solution! To get started, simply log into your ECS Tuning account, Click the "View Orders" button on the My Account home page and select the order that you wish to make a return on to begin. If you have any questions, feel free to reach out to our Customer Service Team for assistance!

Please note: Refunds will be processed to the original payment method used on the order or to an in store credit, respective to the type of return that is made as well as any pre-existing arrangements with an ECS Tuning Customer Service Representative. In the event that multiple forms of payment were used, we will refund the value to an in store credit. In the event that a return label is provided, these charges may be deducted from the total refund you receive.

Original shipping costs are non-refundable and the buyer is responsible for return shipping charges. ECS Tuning will not accept COD deliveries.


All in store credit balances will expire after one year from the original purchase date.

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Shipping Policy

Free Shipping On Orders $49 & Up

Items marked with a 'Free Shipping On Orders $49 and Up' logo may qualify for free standard economy ground shipping to the contiguous United States (48 states) for most orders with a value greater or equal to $49.00 USD. Oversized products and direct ship products are excluded from this offer unless otherwise noted.

Free Shipping

Items marked as 'Free Shipping' may qualify for free standard economy ground shipping to the contiguous United States (48 states). Oversized products and direct ship products are excluded from this offer unless otherwise noted.


The policies listed above are subject to change at any time without notice.

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Lifetime Replacement

Want to know more about our Lifetime Replacement program?

Click here to learn more.

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Why You Should Shop From ECS Tuning

ECS Tuning stands out as more than an automotive parts supplier-it's a vibrant community fueled by a shared passion for cars. Born from the enthusiasm of car lovers, we offer an unmatched understanding and commitment to the automotive world, providing high-quality parts and accessories sourced from our own experiences. Our selection is meticulously crafted to meet the highest standards of performance, quality, and design, catering to both the latest trends and classic styles.


Our distinct advantage lies in our passionate team and comprehensive support, offering expert advice and seamless service from selection to installation. Shopping with ECS brings exclusive perks, including our Lifetime Replacement Guarantee and free shipping on orders over $49, enhancing the value of every purchase. As a central hub for car enthusiasts, ECS Tuning fosters a rich community where ideas and experiences flourish, transforming us from a mere supplier into a platform where automotive dreams come to life.

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Cancellation Policy

At ECS Tuning, we understand that plans can change. That's why we offer a flexible cancellation policy for our customers. You may cancel your order at any time before you receive the shipment confirmation. This policy is designed to provide you with peace of mind and the flexibility to make adjustments to your purchases as needed. Should you decide to cancel your order, simply reach out to our customer service team, and we will assist you with the process swiftly and efficiently.

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Coolant Expansion Tank Replacement Kit
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Coolant Expansion Tank Replacement Kit

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