You’re referring to an OEM A/C compressor, specifically for the 2003–2010 Chevy Silverado or GMC Sierra 2500HD/3500 models equipped with the 6.6L Duramax diesel engine. The part number MC447220-4366 is typically associated with a Denso-manufactured compressor, which is a common OEM supplier for GM vehicles.

Key Details:

Vehicle Compatibility:
- Chevrolet Silverado 2500HD/3500 (2003–2010)
- GMC Sierra 2500HD/3500 (2003–2010)
- Must be equipped with 6.6L Duramax Diesel Engine
OEM Manufacturer:
- Denso
- Part number: MC447220-4366 (can also appear as 447220-4366)
OEM/GM Cross-reference Numbers (may vary slightly):
- GM Part Number: 15-20941, 89019353, or similar depending on year
- Denso Part Number: 471-7026 (may also cross-reference)
Function:
This is the A/C compressor, which compresses refrigerant and circulates it through the air conditioning system to cool the cabin.
Installation Note:
When replacing the A/C compressor, it’s generally recommended to:
- Replace the accumulator/drier
- Replace the orifice tube
- Flush the A/C system
- Use the correct amount and type of PAG oil

FITS:

2003-2010 Silverado Sierra 2500HD 3500 6.6L

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GMC Sierra 2500HD/3500 (2003–2010)

MC447220-4366 AC Compressor Fits 2003 2010 Silverado SIERRA 1500 10S17F – Denso