24/7 Customer service
To make aftermarket auto parts an afterthought.
Add your vehicle
Address
Login
Cart
Item
$0.00
Add your vehicle to ensure fitment/Choose a yearRequired Fields
Select a different vehicle
Make/Model
VIN
Save

2021 Mercedes-Benz C300 Radiator

5 items

Keep engine temperatures under control with an A-Premium radiator. Browse replacement cooling radiators and assemblies for cars, trucks and SUVs.

  • All filters
  • Sort By
  • Price
  • Placement on Vehicle
  • Brand
  • Material
  • Warranty
Aluminum Radiator without Oil Cooler for Mercedes-Benz W205 C300 C350e C400 C43 AMG 3.0LAluminum Radiator without Oil Cooler for Mercedes-Benz W205 C300 C350e C400 C43 AMG 3.0L
A-Premium®Part # APRAD828
Aluminum Radiator without Oil Cooler for Mercedes-Benz W205 C300 C350e C400 C43 AMG 3.0L
4.6139 Reviews
$135.99
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits 2017 - 2021 Mercedes-Benz C43 AMG, 2016 - 2018 Mercedes-Benz C350e, 2016 - 2016 Mercedes-Benz C450 AMG, 2015 - 2018 Mercedes-Benz C300, 2015 - 2015 Mercedes-Benz C400
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2021 Mercedes-Benz C300
Item LocatedUnited States
Installation PositionFront
ConditionNew
item #1004DSGG
Note
【Note-1】 This specific radiator does not include a transmission oil cooler or an engine oil cooler.
【Note-2】 The location of this radiator is primary, meaning it is the main radiator for the vehicle's cooling system.
Show less
Radiator for Mercedes-Benz C300 C43 AMG C63 AMG C63 AMG S 2019-2021
A-Premium®Part # APRAD2572
Radiator for Mercedes-Benz C300 C43 AMG C63 AMG C63 AMG S 2019-2021
4.6139 Reviews
$202.99
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits 2019 - 2021 Mercedes-Benz C300, 2019 - 2021 Mercedes-Benz C43 AMG, 2019 - 2021 Mercedes-Benz C63 AMG, 2019 - 2021 Mercedes-Benz C63 AMG S
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2021 Mercedes-Benz C300
Item LocatedUnited States
Quantity1
Part interchange
MB3010184, A0995001703, 0995001703
ConditionNew
item #1002120H
Show less
Radiator - Primary - TYC 13507
TYCPart # 13507
Radiator - Primary - TYC 13507
53 Reviews
$172.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2019-2022 Mercedes-Benz C43 AMG, 2019-2021 Mercedes-Benz C43 AMG, 2019-2021 Mercedes-Benz C43 AMG, 2017-2018 Mercedes-Benz C300, 2017-2018 Mercedes-Benz C300, 2017-2018 Mercedes-Benz C43 AMG, 2016-2018 Mercedes-Benz C350e, 2016-2016 Mercedes-Benz C450 AMG, 2015-2016 Mercedes-Benz C300, 2015-2015 Mercedes-Benz C400
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2021 Mercedes-Benz C300
Item LocatedUnited States
Quantity1
Installation PositionPrimary
Part interchange
13507, MB3010175, 8013507, CU13507, 099 500 73 03
item #1002NE8E
Show less
Radiator - TYC 13802
TYCPart # 13802
Radiator - TYC 13802
53 Reviews
$288.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2023-2023 Mercedes-Benz C43 AMG, 2023-2023 Mercedes-Benz C43 AMG, 2022-2023 Mercedes-Benz C300, 2022-2023 Mercedes-Benz C300, 2022-2023 Mercedes-Benz C300, 2022-2023 Mercedes-Benz C300, 2021-2021 Mercedes-Benz C300, 2019-2020 Mercedes-Benz C300, 2019-2020 Mercedes-Benz C300, 2019-2020 Mercedes-Benz C300, 2019-2020 Mercedes-Benz C300
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2021 Mercedes-Benz C300
Item LocatedUnited States
Quantity1
Part interchange
13802, MB3010184, 099 500 17 03
item #1002NCU0
Show less
Radiator for Mercedes-Benz C300 C43 AMG C63 AMG 2019-2021
AisinPart # RDTMB-00601
Radiator for Mercedes-Benz C300 C43 AMG C63 AMG 2019-2021
4.6139 Reviews
$223.99
Low stock: Only 4 left
Enter ZIP codeFree standard shipping
2-year warranty
90 days free return
Fits 2019 - 2021 Mercedes-Benz C300, 2019 - 2021 Mercedes-Benz C43 AMG, 2019 - 2021 Mercedes-Benz C63 AMG, 2019 - 2021 Mercedes-Benz C63 AMG S
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: 2021 Mercedes-Benz C300
Item LocatedUnited States
MaterialAluminum
Part interchange
366510410156
ConditionNew
item #1018ZW8Q
Show less

Car Radiator Design and Engine Cooling

Engine coolant carries heat away from the engine to the car radiator, where tubes and fins transfer it to passing air. Coolant circulation and airflow both matter. The water pump circulates coolant, the thermostat regulates its route, and the fans support airflow when needed.

Radiator Cooler Connections

For radiator replacement, cooling-system connections matter as much as the core itself. An automotive radiator may also contain a transmission-fluid or engine-oil heat exchanger. These separate fluid circuits require their own connections. Include the cooler arrangement when comparing replacement radiators.

What to Compare Beyond Radiator Dimensions

Core height, width, and thickness describe the heat-exchanger section, not necessarily the complete assembly. Tanks, mounting brackets, hose necks, and cooler fittings add to its overall size. Fan-shroud attachments also need to line up without pulling the radiator out of position.

Two design details help explain radiator descriptions:

  • Crossflow radiators have side tanks; downflow radiators have top and bottom tanks. The surrounding cooling system and available space determine the appropriate layout.
  • Core and tank materials are separate specifications. An aluminum core can be combined with different tank materials, so read both descriptions when comparing construction.

Radiator Assemblies and Related Cooling Parts

An assembly may be the radiator alone or a package with additional cooling components. A-Premium offers both individual radiators and selected radiator-and-fan combinations; the included-parts description establishes what comes in each package. Check the package contents for cooler connectors, caps, and mounting cushions.

The radiator, condenser, and fans sit close together but perform different tasks. A blocked air path can limit heat rejection even when the radiator does not leak. Before fitting a replacement, inspect the surrounding supports and air passages so bent brackets or trapped debris do not damage the new unit.

Frequently Asked Questions

Can a radiator flush repair a leaking radiator?

No. Flushing may remove some contamination, but it does not repair a cracked tank, damaged tube, or leaking joint. Locate the leak with the cooling system cold and have its repairability assessed before choosing cleaning or replacement.

Is plain water suitable for everyday radiator use?

Use the coolant specification and concentration required by the vehicle manufacturer. Plain water lacks the intended freeze and corrosion protection. Coolant color alone is not a reliable way to identify a compatible formula.

Should the pressure cap be replaced with the radiator?

Not automatically, but its seals and pressure function deserve attention. A damaged or incorrect cap can affect system operation. Some vehicles place the pressure cap on a separate reservoir, so order by the system's specified cap type and rating.

Why can an engine still overheat after radiator replacement?

Trapped air, a thermostat fault, poor coolant circulation, or an inoperative fan can remain after the radiator is changed. Stop driving if the temperature rises abnormally and diagnose the system rather than assuming the new radiator is defective.

When is it safe to open the cooling system?

Only after the engine and cooling system have cooled fully, following the owner's instructions. Hot coolant can remain pressurized and escape suddenly when a cap is loosened. Do not use the dashboard temperature reading alone as permission to open it.

Related Blogs

Can a Dirty Radiator Cause Overheating? External Debris vs. Internal Clogs

Distinguish external debris blocking airflow from internal clogs restricting coolant flow. Learn to identify symptoms, safely clean fins, diagnose issues, and decide between flushing or replacement to prevent engine damage.

Sep 01, 2026

What Is a Radiator in a Car?

When it comes to keeping a car's engine running smoothly, one vital component plays a crucial role: the radiator.

Aug 17, 2026

How Much Does It Cost to Replace a Radiator?

Is your radiator on the fritz? Dive into our guide that outlines the warning signs, provides a step-by-step replacement tutorial, breaks down costs, and offers advice on picking the perfect radiator to ensure your ride stays cool and efficient.

Aug 17, 2026

How to Repair a Car Radiator

Learn how to diagnose radiator leaks and clogs, and repair or replace your radiator to prevent engine overheating.

Jul 21, 2026

Radiator Failure: Causes, Signs, and Prevention Tips

Radiator failure can bring your car to a screeching halt, but understanding the causes and learning how to deal with it can save you from major headaches.

Jul 21, 2026