For 2003-2010 BMW 750Li 745Li 650i 550i 750i 745i 645Ci AC Compressor
For 2003-2010 BMW 750Li 745Li 650i 550i 750i 745i 645Ci AC Compressor is a direct-fit, factory-replacement air-conditioning compressor that ships pre-filled with 80 ml of oil, eliminating the need for separate lubrication. Priced at $146.50, it restores full cooling performance on high-displacement BMW models from 2003-2010, especially when the original unit fails.
● In stock
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Key features
- OEM-spec cast-iron housing for durability
- High-efficiency scroll rotor matches factory performance
- Pre-filled with ~80 ml synthetic oil – no extra oil needed
- Direct fit for 4.4 L and 4.8 L BMW V8 engines (2003-2010)
- Matches OEM part numbers like 639862 and 447150-0390
- Designed for 5-Series, 6-Series, and 7-Series models
Pros
- +Restores full cooling capacity on failing OEM units
- +Pre-charged oil eliminates a common installation step
- +Fits without modifications, reducing labor time
- +Robust cast-iron construction resists wear
Cons
- −Requires a complete system flush before installation
- −Higher price than generic universal compressors
- −Installation may be challenging for beginners
About For 2003-2010 BMW 750Li 745Li 650i 550i 750i 745i 645Ci AC Compressor
What is For 2003-2010 BMW 750Li 745Li 650i 550i 750i 745i 645Ci AC Compressor?
The For 2003-2010 BMW 750Li 745Li 650i 550i 750i 745i 645Ci AC Compressor is an OEM-spec replacement designed to fit the complete range of high-output BMW V8 and V12 models produced between 2003 and 2010. Engineered with a cast-iron housing and a high-efficiency scroll rotor, the unit delivers the same pressure curve as the factory part, ensuring rapid refrigerant circulation and consistent cabin temperature. Each compressor arrives pre-charged with roughly 80 ml of synthetic oil, so installers do not need to add extra lubricant. The part matches all original part numbers, including 639862 and 447150-0390, and is compatible with both 4.4-liter and 4.8-liter engine variants.
Installation requires standard A/C service tools and a thorough system flush before mounting. Technicians should remove the drive belt, disconnect the battery, and drain any residual oil from the old unit. After the new compressor is bolted in, the refrigerant lines are inspected for metal debris, and a non-oil-based flush is run through the condenser and evaporator to prevent contamination. Once the system is recharged, the compressor should be tested for proper pressure and temperature rise.
Key features
- OEM-spec cast-iron housing — durable construction matches original durability.
- High-efficiency scroll rotor — maintains factory pressure and flow rates.
- Pre-filled with ~80 ml oil — no extra oil required for installation.
- Direct fit for 4.4 L and 4.8 L V8 engines — covers all 2003-2010 BMW V8 models.
- Matches OEM part numbers — includes 639862, 447150-0390 and others.
- Designed for 5-Series, 6-Series, and 7-Series — fits multiple BMW series.
Who is For 2003-2010 BMW 750Li 745Li 650i 550i 750i 745i 645Ci AC Compressor for?
The compressor is intended for professional automotive technicians, DIY enthusiasts with intermediate mechanical experience, and owners of BMW 5-Series, 6-Series, and 7-Series models that rely on robust climate control. It is especially valuable for vehicles equipped with the 4.4-liter V8 or 4.8-liter V8 engines, where cooling demand is high and OEM-grade parts are required to maintain warranty compliance.
How does For 2003-2010 BMW 750Li 745Li 650i 550i 750i 745i 645Ci AC Compressor compare?
Compared with generic aftermarket compressors, this unit matches the original equipment specifications for torque, flow rate, and oil capacity, delivering identical cooling efficiency. While universal compressors may require additional oil and adapters, the For 2003-2010 BMW AC Compressor fits directly without modification, reducing installation time and risk of leaks. Its cast-iron construction also offers longer service life than many lightweight aluminum alternatives.
Best use cases
- →Replacing a burnt-out compressor on a 2007 BMW 750Li
- →Upgrading cooling performance on a 2005 BMW 645Ci
- →Restoring A/C after a refrigerant leak in a 2009 BMW 750i
- →DIY rebuild of a 2004 BMW 550i climate system
Is For 2003-2010 BMW 750Li 745Li 650i 550i 750i 745i 645Ci AC Compressor right for you?
Buy this compressor if you own a 2003-2010 BMW with a 4.4 L or 4.8 L V8 engine and need a reliable, factory-grade replacement. It’s best suited for technicians or confident DIYers who can perform a full A/C system flush and have basic hand-tool skills. Alternatives include universal aftermarket compressors, which are cheaper but often require extra oil, adapters, and may not meet OEM pressure specs. Choose this part to maintain warranty compliance and ensure long-term cooling performance.
How it compares: Compared with generic aftermarket compressors, this BMW-specific unit offers exact torque, flow rate, and oil capacity matching the original part, eliminating the need for extra oil or adapters. While universal compressors are cheaper, they often sacrifice durability and may cause leaks. The cast-iron design also outlasts many lightweight aluminum alternatives.
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What symptoms indicate the AC compressor needs replacement?
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Typical signs include a warm or uneven cabin temperature, the compressor clutch not engaging, audible grinding noises, or the A/C system failing to build pressure after a recharge. In many cases the unit will also leak refrigerant or emit a burnt oil odor.
Does the compressor come with oil pre-charged?
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Yes, each unit is supplied with approximately 80 ml of synthetic oil already sealed inside the housing, so you do not need to add additional oil during installation. This pre-charge matches the OEM specification and helps ensure proper lubrication from the moment the compressor is powered.
How do I install the compressor correctly?
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Begin by disconnecting the battery and removing the drive belt. Drain any oil from the old unit, then detach the refrigerant lines and inspect them for debris. After bolting the new compressor in place, flush the system with a non-oil-based cleaner, recharge with the correct refrigerant, and verify pressure and temperature rise.
Is this part compatible with both 4.4 L and 4.8 L engines?
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The compressor is engineered to fit all BMW V8 models in the 2003-2010 range, covering both the 4.4-liter and 4.8-liter engine families. It matches the mounting points, pulley size, and refrigerant line connections for each displacement, ensuring a seamless swap without the need for adapters.
Can I use this compressor on a vehicle that has a different BMW model year?
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The unit is specific to the 2003-2010 model years and the listed engine sizes. Using it on earlier or later BMWs, or on models with different cooling system designs, may result in improper fit, mismatched oil capacity, or pressure discrepancies. Stick to the recommended years for reliable operation.
How much does For 2003-2010 BMW 750Li 745Li 650i 550i 750i 745i 645Ci AC Compressor cost?
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For 2003-2010 BMW 750Li 745Li 650i 550i 750i 745i 645Ci AC Compressor is $146.50 at Lab Work Auto. Prices may change — click through to Lab Work Auto for the latest.
Is For 2003-2010 BMW 750Li 745Li 650i 550i 750i 745i 645Ci AC Compressor in stock at Lab Work Auto?
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Yes, For 2003-2010 BMW 750Li 745Li 650i 550i 750i 745i 645Ci AC Compressor is currently in stock at Lab Work Auto.
Specifications
- SKU
- F8-014124