Mercedes Benz W203 W211 W204 M271 940 Kompressor Aircond Compressor 6PK - A0012302811

Diagnosis and Common Symptoms

From a technical standpoint, the air conditioning compressor on the M271 engine is a high-duty cycle component. Failure typically manifests through internal mechanical seizing or the failure of the electromagnetic clutch. Common symptoms include a noticeable metallic grinding or "clattering" noise emanating from the front of the engine, particularly when the AC is engaged. If your Mercedes is blowing warm air despite a full refrigerant charge, or if you notice an erratic idle when the climate control is active, the compressor is likely failing. Diagnostic scans may reveal fault codes related to the AC pressure sensor or the compressor control valve circuit.

Introduction

Maintaining the high-pressure integrity of your Mercedes-Benz climate system requires components built to exact factory tolerances. This unit is a Genuine Used air conditioning compressor that has undergone rigorous bench testing to ensure internal compression and pulley stability. Unlike aftermarket alternatives that often struggle with heat dissipation, this Genuine part ensures your W203, W211, or W204 retains its original cooling efficiency.

Product Details

• Brand: Mercedes-Benz (Genuine)
• Model Compatibility: W203 C-Class, W211 E-Class, W204 C-Class (M271 Engine)
• Part Name: Aircond Compressor 6PK
• Part Number: A0012302811
• Condition: Genuine Used (Tested Working)
• Notes: This is the 6-groove (6PK) pulley variant. It is essential to flush the AC system and replace the receiver drier before installation to maintain the warranty and prevent debris from the old unit damaging this compressor.