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Engine thermostat assembly, designed for Mercedes-Benz vehicles with the M271 1.8L petrol engine, Kompressor or CGI turbo. Intended for engines with slow warm-up, unstable operating temperature, overheating or poor heater performance. Sold per unit, variant specific as supplied with housing and sensor where applicable.
What this is / isn’t:
Included: 1× thermostat assembly
Important: Match by VIN and engine code M271. Early Kompressor and later CGI direct-injection versions can use different housings, outlet angles and connectors. Always confirm by OE part number.
Key Features:
Temperature control: Opening temp and flow for stable engine and cabin heat.
Integrated housing and seal: Replacement to minimise leaks and comeback repairs.
Correct sensor or actuator logic: Works with the ECU for accurate warm up and efficiency.
Materials: High temp plastics and elastomers.
Fitment: Designed to use the existing mounting points.
Compatibility:
Common applications equipped with the M271 Four cylinder, match by VIN or OE:
C Class W203, W204 C180, C200, C230K, C200 CGI, C250 CGI
E Class W211, early W212 E200K, E200 CGI
CLK C209, A209 200K trims
SLK R171, early R172 200K and 200 CGI
GLK X204 200 CGI where fitted
Note: Some markets vary by year and emissions package, verify via VIN.
Options, engine or sensor variations:
M271 Kompressor → thermostat with specific housing orientation.
M271 EVO or CGI → revised housing and connector, check supersessions.
Model year revisions → later updates may change outlet and sensor style.
Always order by the exact OE part number on your vehicle or confirm via VIN.
Symptoms of a faulty thermostat:
Slow warm up, temperature gauge low or fluctuating.
Overheating at idle or in traffic.
Weak cabin heat, fault code P0128 Or similar temperature errors.
Coolant seepage at housing, dried crust around joints.
Installation notes, pro tips:
Work on a cold engine. Drain coolant to below the housing level.
Replace the seal or O ring, clean mating faces, torque bolts evenly to spec.
Refill with Mercedes approved coolant, MB 325.x Spec, bleed the system thoroughly.
Verify fan operation and hose temperatures on first heat cycle, clear stored codes after a road test.
Inspect adjacent hoses, clamps and plastic tees for age related brittleness.
What’s included / not included:
Included: 1× Thermostat assembly with housing and seal, sensor or actuator if supplied
Not included: Coolant, hoses, clamps, water pump, radiator, extra sensors, hardware
Q&A
Q1: How do I confirm I have the M271 engine?
Check the VIN data card or engine stamp. M271 appears in many C, E, CLK, SLK and GLK models. Your VIN will map to the exact part number.
Q2: Do I need coding after replacement?
Clear fault codes and verify operating temperature with a scan tool.
Q3: Which coolant should I use?
Mercedes coolant meeting MB 325.x Specification, mixed to the correct ratio for your climate.
Q4: Should I change anything else at the same time?
Consider a coolant service, inspect hoses and clamps, and replace brittle plastic fittings.
Condition: New aftermarket replacement part. Not an original Mercedes-Benz part; brand and model names are used only to show fitment.


Hello! Need help? Don’t worry, I’ve got you. Tell me what’s up, and I’ll be happy to assist 💁
