Genuine OEM 2602002900 - Engine Coolant Thermostat Kit

Product Overview

This Genuine OEM 2602002900 engine coolant thermostat kit is designed for Mercedes-Benz compact models powered by the 2.0L turbocharged four-cylinder engine. The kit fits A-Class, CLA-Class, GLA-Class, and GLB-Class vehicles from 2019 to 2023, including both standard and AMG variants. The thermostat regulates coolant flow to maintain optimal engine operating temperature and is essential for proper cooling system function and fuel efficiency.

This thermostat kit is a single replacement unit. One kit per vehicle is required for a complete cooling system service.

Symptoms of a Failing Engine Coolant Thermostat

• Engine runs hotter than normal or temperature gauge reads in the high zone.
• Engine runs too cold and takes longer to reach operating temperature.
• Fluctuating temperature gauge that moves erratically between hot and cold.
• Coolant leaking from the thermostat housing area.
• Dashboard warning light for engine temperature or coolant system illuminates.
• Reduced heater output or inconsistent cabin temperature control.

Cross Reference Numbers

This Genuine OEM 2602002900 is equivalent to or replaces the following part numbers: 260-200-29-00, 2602002600.

Vehicle Compatibility

This kit fits the popular models below. For Fitment Confidence, please use the vehicle selector tool above to verify exact compatibility for your vehicle.

• Mercedes-Benz A220 2.0 L4 Gas: 2019–2022
• Mercedes-Benz A35 AMG 2.0 L4 Gas: 2020–2021
• Mercedes-Benz CLA250 2.0 L4 Gas: 2020–2023
• Mercedes-Benz CLA35 AMG 2.0 L4 Gas: 2020–2021
• Mercedes-Benz GLA250 2.0 L4 Gas: 2021–2023
• Mercedes-Benz GLA35 AMG 2.0 L4 Gas: 2021–2023
• Mercedes-Benz GLB250 2.0 L4 Gas: 2020–2023
• Mercedes-Benz GLB35 AMG 2.0 L4 Gas: 2021–2022

This kit may also fit other applications. Please use the vehicle selector tool to verify fitment.

Often Replaced Together

For a complete cooling system service, many owners replace the following at the same time:

• Engine coolant or antifreeze (full flush recommended with thermostat replacement).
• Coolant hoses and clamps if showing signs of age or deterioration.
• Water pump if mileage is high and the system is being opened.
• Radiator cap to ensure proper system pressure.

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Frequently Asked Questions

How do I know if my Mercedes-Benz A220, CLA250, or GLA250 needs a new thermostat?

Common signs include the engine running too hot or too cold, a temperature gauge that fluctuates, longer warm-up times, or a coolant leak around the thermostat housing. If your dashboard warning light illuminates or your heater output drops, the thermostat may be stuck or failing. A diagnostic scan can confirm thermostat malfunction on modern Mercedes vehicles.

Can I replace the thermostat myself, or do I need a professional?

Thermostat replacement requires draining coolant, removing hoses and fasteners, and refilling the system. You will need basic hand tools, a drain pan, jack and jack stands, and new coolant. While experienced DIY enthusiasts can perform this work, the cooling system must be bled of air after installation. If you are not confident with cooling system work, professional installation is recommended.

What type of coolant should I use with this thermostat kit?

Refer to your vehicle's owner manual for the specific coolant type and capacity. Mercedes-Benz vehicles typically use a pink or red long-life coolant. Using the correct coolant type is important for corrosion protection and system longevity. Never mix different coolant types.

Will this thermostat kit work on both 4MATIC and standard models?

Yes. This Genuine OEM thermostat is the same regardless of drivetrain. Both 4MATIC (all-wheel drive) and standard rear-wheel-drive versions of the A220, CLA250, GLA250, and GLB250 use the same cooling system and thermostat.

Is this kit compatible with both base and AMG variants?

Yes. This thermostat kit fits base models, AMG 35 variants, and all trim levels from 2019 to 2023. All 2.0L turbocharged four-cylinder models in the A-Class, CLA-Class, GLA-Class, and GLB-Class share the same thermostat housing and component.

How often should the thermostat be replaced?

Thermostats do not have a set replacement interval. They are typically replaced only when they fail or show signs of malfunction. However, if the cooling system is being serviced for another reason, or if your vehicle has high mileage, a new thermostat is often a good preventive measure to avoid future cooling issues.

Order Genuine OEM 2602002900 today. In-stock orders ship same or next business day from our U.S. warehouse, and our fitment team is one call away if you need help confirming the right part for your Mercedes-Benz.

Note: All information on this page and in the FAQ is for general reference only. Verify fitment and consult a professional as needed. eEuroparts.com is not responsible for incorrect part selection or installation.