Genuine OEM 1132030275 - Engine Coolant Thermostat Kit

Product Overview

The Genuine OEM 1132030275 is an engine coolant thermostat kit engineered for Mercedes-Benz supercharged 5.5L V8 AMG models. This OEM-specification component maintains optimal coolant temperature across the W209 CLK55 AMG, W210 E55 AMG, W220 S55 AMG, R230 SL55 AMG, W463 G55 AMG, and C126 CL55 AMG platforms from 2003 to 2011. The thermostat regulates coolant flow to the engine block and radiator, ensuring efficient thermal management and preventing overheating or excessive cold-start heat loss. As a Genuine OEM part, this kit meets factory specifications and is backed by dealership warranty coverage, making it the preferred choice for owners seeking factory-matched reliability.

This thermostat kit is sold as a complete assembly. Order quantity 1 for a full engine cooling system service.

Symptoms of a Failing Engine Coolant Thermostat

• Engine running hotter than normal or temperature gauge reading in the red zone
• Coolant leaking from the thermostat housing or surrounding gasket areas
• Slow warmup time on cold starts; cabin heater not producing hot air quickly
• Erratic temperature gauge fluctuations or needle bouncing
• White steam or coolant vapor visible from under the hood
• Check Engine light or cooling system warning messages on the instrument cluster

Cross Reference Numbers

This Genuine OEM 1132030275 is equivalent to or replaces the following part numbers: 113-203-02-75, 1132030275.

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 CL55 AMG 5.5 V8 Supercharged (C126): 2003–2006
• Mercedes-Benz CLK55 AMG 5.5 V8 Supercharged (W209): 2003–2006
• Mercedes-Benz CLS55 AMG 5.5 V8 Supercharged (C218): 2006
• Mercedes-Benz E55 AMG 5.5 V8 Supercharged (W210): 2003–2006
• Mercedes-Benz G55 AMG 5.5 V8 Supercharged (W463): 2005–2011
• Mercedes-Benz S55 AMG 5.5 V8 Supercharged (W220): 2003–2006
• Mercedes-Benz SL55 AMG 5.5 V8 Supercharged (R230): 2003–2008

This 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 (OEM specification fluid; check your service manual for capacity and type)
• Coolant hoses and clamps (inspect for cracks and deterioration)
• Radiator cap and pressure relief valve
• Water pump (if mileage warrants preventive replacement)

Why Shop at eEuroparts.com?

• Proven Expertise: Over 25 years of experience with European vehicles means we know your car inside and out.
• Fitment Confidence: Our accurate cataloging ensures you get the right part the first time, backed by our fitment guarantee.
• Fast, Reliable Shipping: Most in-stock orders ship the same or next business day from our U.S.-based warehouse.
• Transparent Pricing: Competitive prices with no hidden fees or surprise charges.
• Exclusive Kits That Fit™: Complete repair solutions with no guesswork.
• Established Trust: Serving the European car community since 2000.

Frequently Asked Questions

How do I know if my Mercedes-Benz E55 AMG or S55 AMG needs a new thermostat?

The most common sign is a temperature gauge that reads higher than normal or climbs into the red zone during normal driving. You may also notice the engine taking longer than usual to warm up on cold starts, or the cabin heater not blowing hot air quickly. Coolant leaks around the thermostat housing or a visible Check Engine light related to cooling are also strong indicators. If you observe any of these symptoms, have the cooling system inspected promptly to prevent engine damage.

Is this a complete kit, or do I need additional parts?

The 1132030275 is a complete thermostat assembly kit that includes the thermostat, housing, and necessary gaskets. You will not need to source additional thermostat components. However, it is good practice to replace your engine coolant and inspect hoses and clamps at the same time, especially if your vehicle has high mileage or the coolant has not been changed recently.

What is the difference between OEM and aftermarket thermostats?

Genuine OEM thermostats are engineered to exact Mercedes-Benz specifications and are calibrated to open and close at precise temperature thresholds optimized for your engine. Aftermarket alternatives may vary in calibration and material quality. Because the 5.5L supercharged V8 in your AMG model runs at elevated temperatures, using a Genuine OEM thermostat ensures reliable thermal regulation and protects your engine's longevity. OEM parts are also backed by dealership warranty coverage.

Can I install this thermostat myself, or do I need a professional?

Thermostat replacement requires draining coolant, removing the thermostat housing, and installing gaskets correctly to prevent leaks. You will need a floor jack, jack stands, socket set, and a torque wrench. Consult your factory service manual for exact torque specifications and coolant capacity. If you are not confident in your mechanical skills or do not have the necessary tools, professional installation is recommended to ensure proper torque and no leaks.

How often should I replace the thermostat on my W220 S55 AMG or W210 E55 AMG?

Thermostats do not have a fixed replacement interval; they are replaced when they fail or show symptoms of malfunction. However, if you are performing a major cooling system service or have high mileage (over 100,000 miles), many technicians recommend replacing the thermostat as preventive maintenance to avoid future cooling issues. Always consult your owner's manual or service advisor for guidance specific to your vehicle's condition and history.

Will this kit fit my 2003 CLK55 AMG or other W209 models?

Yes. The 1132030275 is confirmed to fit all W209 CLK55 AMG models from 2003 onward that are equipped with the 5.5L supercharged V8 engine. The chassis reference confirms compatibility across the CLK55 AMG lineup. Always verify your specific trim and engine before ordering, and use the vehicle selector tool on this page to confirm fitment for your exact model year and configuration.

Why Shop at eEuroparts.com?

• Proven Expertise: Over 25 years of experience with European vehicles means we know your car inside and out.
• Fitment Confidence: Our accurate cataloging ensures you get the right part the first time, backed by our fitment guarantee.
• Fast, Reliable Shipping: Most in-stock orders ship the same or next business day from our U.S.-based warehouse.
• Transparent Pricing: Competitive prices with no hidden fees or surprise charges.
• Exclusive Kits That Fit™: Complete repair solutions with no guesswork.
• Established Trust: Serving the European car community since 2000.

Order Genuine OEM 1132030275 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 AMG.

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.