Genuine OEM 1102000515 - Engine Coolant Thermostat

Product Overview

The Genuine OEM 1102000515 engine coolant thermostat is the factory-specification cooling system component for Mercedes-Benz W201 (190E), W124 (260E, 300E, 300CE, 300SE, 300SEL, 300TE), W202 (C280, C36 AMG), W210 (E320), W140 (S320), and R129 (SL320) models from 1985 to 1999. This thermostat regulates coolant flow to maintain optimal engine operating temperature across all driving conditions. As a Genuine Mercedes-Benz part, it meets factory specifications and is backed by dealership warranty coverage, ensuring reliable thermal management and engine longevity.

Symptoms of a Failing Engine Coolant Thermostat

• Engine runs cold; temperature gauge remains low even after extended driving
• Engine overheats; temperature gauge climbs into the red zone or warning light illuminates
• Erratic temperature gauge behavior; needle fluctuates between hot and cold
• Coolant leakage around the thermostat housing or water outlet
• Heater blows cold air even when engine is warm and heat is requested
• Check Engine light or coolant temperature sensor faults stored in the diagnostic module

Cross Reference Numbers

This Genuine OEM 1102000515 thermostat is equivalent to or replaces the following part numbers: 110-200-05-15, 1102000515.

Vehicle Compatibility

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

• Mercedes-Benz 190E 2.3 L4 Gas (W201): 1985–1988
• Mercedes-Benz 190E 2.3-16 L4 Gas (W201): 1986–1988
• Mercedes-Benz 190E 2.6 L6 Gas (W201): 1987–1993
• Mercedes-Benz 190E 2.3 L4 Gas (W201): 1991–1993
• Mercedes-Benz 260E L6 Gas (W124): 1987–1989
• Mercedes-Benz 300E L6 Gas (W124): 1986–1993
• Mercedes-Benz 300E 2.6 L6 Gas (W124): 1990–1992
• Mercedes-Benz 300E 2.8 L6 Gas (W124): 1993
• Mercedes-Benz 300E 4MATIC L6 Gas (W124): 1990–1993
• Mercedes-Benz 300CE Coupe L6 Gas (W124): 1988–1993
• Mercedes-Benz 300SE Sedan L6 Gas (W124): 1988–1992
• Mercedes-Benz 300SEL Sedan L6 Gas (W124): 1988–1991
• Mercedes-Benz 300TE Wagon L6 Gas (W124): 1988–1993
• Mercedes-Benz 300TE 4MATIC Wagon L6 Gas (W124): 1990–1993
• Mercedes-Benz 300SL Roadster L6 Gas (R129): 1990–1993
• Mercedes-Benz C280 Sedan L6 Gas (W202): 1994–1997
• Mercedes-Benz C36 AMG Sedan L6 Gas (W202): 1995–1997
• Mercedes-Benz E320 Sedan L6 Gas (W210): 1994–1997
• Mercedes-Benz S320 Sedan L6 Gas (W140): 1994–1999
• Mercedes-Benz S320 LWB L6 Gas (W140): 1994–1999
• Mercedes-Benz SL320 Roadster L6 Gas (R129): 1994–1997

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

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 W201 or W124 needs a new thermostat?

The most common sign is an engine that runs persistently cold or hot. If your temperature gauge stays below the normal midpoint even after 10 to 15 minutes of driving, or if it climbs toward the red zone, the thermostat may be stuck open or closed. You may also notice the heater produces only lukewarm air, or coolant leaks from the thermostat housing. A diagnostic scan can reveal coolant temperature sensor codes that point to thermostat malfunction.

How long does thermostat replacement take?

Thermostat replacement on W201 and W124 models typically takes 1 to 2 hours for a professional technician. The exact time depends on engine configuration and thermostat housing location. You will need basic hand tools, a drain pan for coolant, and a wrench or socket set. After installation, the cooling system must be refilled and bled of air to prevent overheating and cavitation.

What tools and supplies do I need to replace the thermostat?

You will need a floor jack and jack stands, a socket set and wrenches, a drain pan, fresh coolant (Mercedes-Benz specification), a gasket scraper, and a new gasket or O-ring (often included with the thermostat housing). A torque wrench ensures proper fastener tightness, and a coolant refill funnel simplifies the bleed process. Consult your service manual for specific socket sizes and torque values.

Should I replace the coolant when I replace the thermostat?

It is good practice to drain and refill the cooling system when replacing the thermostat. This removes old coolant that may contain corrosion particles or sediment, and it gives you an opportunity to inspect the system for leaks or damage. If the coolant is fresh and the system is clean, you may reuse it, but flushing is recommended for vehicles over 50,000 miles or if the coolant appears discolored.

What is the difference between Genuine OEM and aftermarket thermostats?

Genuine OEM thermostats are manufactured to Mercedes-Benz factory specifications and are the same parts installed on the assembly line. They undergo strict quality control and are backed by dealership warranty. Aftermarket thermostats may cost less but can vary in opening temperature, build quality, and longevity. For a vehicle as precision-engineered as a Mercedes-Benz, Genuine OEM parts ensure consistent thermal management and compatibility with the engine control module.

Can a failing thermostat damage my engine?

Yes. A thermostat stuck closed will cause the engine to overheat, which can warp cylinder heads, damage gaskets, and degrade oil viscosity. A thermostat stuck open will allow the engine to run too cool, increasing wear, reducing fuel economy, and causing carbon buildup. Prolonged operation outside the optimal temperature range accelerates engine aging and can lead to costly repairs. Prompt replacement prevents secondary damage.

Order Genuine OEM 1102000515 today to restore proper coolant temperature regulation in your Mercedes-Benz W201, W124, W202, W210, W140, or R129. 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 vehicle.

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.