Mercedes-Benz Cooling Systems
availability
Relay
Mercedes-Benz
002-542-66-19
Additional fan in wheelhouse. Secondary air pump "o". Engine control unit relay.
$24.50
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Cooling System Parts in Brief
This category includes genuine Mercedes-Benz radiators, water pumps, thermostats, hoses, coolant reservoirs, and related parts for select models. OEM cooling parts help maintain correct operating temperature, protecting the engine and supporting efficient performance.
A Mercedes-Benz cooling system keeps the engine within a narrow temperature range. Leaks, failing pumps, or stuck thermostats can lead to overheating, warning messages, or reduced heater output. Browse focused categories such as radiators and parts, water pumps, and thermostats, or shop the full range here.
Coolant Circulation and Heat Exchange Components
- Radiators and radiator supports
- Mechanical and electric water pumps
- Thermostats and housings
- Coolant hoses, pipes, and clamps
- Expansion tanks and reservoir caps
- Auxiliary coolant pumps and temperature sensors where applicable
Why Genuine Cooling Parts Protect Temperature Control
Mercedes-Benz engines are designed around specific coolant flow and temperature targets, and some use electronically controlled thermostats or pumps. Genuine parts are designed to work with those controls. Aftermarket thermostats or pumps may open at different temperatures or flow differently, which can affect warm-up, efficiency, or warning messages. OEM hoses and caps also match factory routing and pressure ratings.
Matching Cooling Parts to Your Engine
Enter your year, model, trim, and engine, since cooling components vary widely by engine. Confirm details with your VIN, and search by the part number from the old component when possible. Use the coolant specified in your owner's manual or service information.
Engine, Drivetrain, and Equipment Variations
Cooling system fitment varies by engine, model year, drivetrain, and equipment, and AMG or electrified models may use additional cooling circuits. Confirm fitment before purchase. Never open a hot cooling system, and if the engine has overheated, have related components inspected before returning to regular driving. During repairs, review hoses and clamps and fan kits as well.
Cooling System Shopping Essentials
- Includes radiators, pumps, thermostats, hoses, tanks, and sensors.
- OEM parts match factory flow, temperature, and pressure specifications.
- Engine is the key fitment detail.
- Use the coolant specified for your vehicle.
- Never open a hot cooling system.
Mercedes-Benz Cooling System Questions
What are the signs of a cooling system problem?
Rising temperature readings, coolant warnings, puddles under the car, a sweet smell, or weak cabin heat can indicate a cooling issue.
What coolant does my Mercedes-Benz need?
Use the coolant specified in your owner's manual or service information, since mixing types can affect protection.
Should I replace the thermostat with the water pump?
Many owners do both at once to save on labor, especially at higher mileage. Ask your technician.
Are OEM cooling parts worth it?
OEM parts match the engine's temperature controls and pressure ratings, supporting reliable cooling.
Can I replace cooling parts myself?
Simple items like reservoir caps may be easy, but bleeding air from the system often requires specific procedures. A technician is recommended for most repairs.