denso 447220-4771

The designation denso 447220-4771 refers to a specific model within Denso’s long-standing line of automotive air-conditioning compressors — a component that quietly does one of the job’s most important tasks: moving refrigerant through a vehicle’s A/C system so occupants stay cool and systems operate efficiently. At first glance the part number is just a string of digits and dashes, but behind it sits engineering: a compressor family (often referenced as Denso 10-series, e.g. 10PA/10S variants), vehicle fitment histories, clutch and pulley ­specifications, oil charge and refrigerant compatibilities, and aftermarket remanufacture options. For technicians, fleet managers, owners of equipment such as tractors or buses, and automotive students, understanding what a Denso part number like 447220-4771 means in practice — in terms of specs, compatibility, installation, common failure modes, maintenance best practices, and sourcing options — pays dividends in safety, cost savings and reliability.

This long-form article unpacks the Denso 447220-4771 comprehensively: what the number denotes in Denso’s product universe, typical technical specifications and variants, how to identify OEM versus remanufactured units, vehicle and equipment fitment considerations, step-by-step installation and troubleshooting guidance, lifetime maintenance practices, buying and warranty tips, environmental and refrigerant considerations, and frequently asked practical questions. Wherever useful, I’ll cite manufacturer or catalog references so you can verify critical details. Whether you’re a professional technician or a curious vehicle owner, this guide aims to turn the cryptic part number into actionable knowledge that helps you choose, install, and maintain the right compressor for your application. Villetech+2GeniussTech+2

1. What the Part Number Means — decoding “447220-4771”

A modern OEM part number like 447220-4771 is a key used by manufacturers and distributors to identify a specific assembly variant. In Denso’s ecosystem this typically maps to a compressor family (for example, the Denso 10PA or 10S series), specific mounting and port configurations, clutch/pulley dimensions, and factory oil charge/refrigerant pairing. That means two compressors that look similar may carry different part numbers because they were built for different vehicles, different voltage systems (12V vs 24V), or different pulley grooves and diameters. In plain terms: the number tells you which exact compressor you need for which application. Several aftermarket and informational pages list 447220-4771 as an A/C compressor SKU within Denso’s 10-series family, describing it as intended for automotive and off-road equipment (tractors, light trucks) and noting its compatibility with R-134a systems in many instances. Villetech+1

Understanding that part numbers encode mechanical and electrical details is essential. For example, the same basic compressor model might be produced in an 8-groove pulley or a 6-groove pulley variant; might be optimized for a specific belt type; or might have a clutch with a 130 mm diameter versus 136 mm, any of which will affect fitment on a particular engine. Denso (and distributors) publish cross-reference tables so technicians can match OE numbers to current SKUs or remanufactured replacements. Before buying, always compare the exact OEM number on the old compressor to the seller’s listing and the application guide to avoid mismatches. acparts.com+1

2. Typical Technical Characteristics (What to expect from a Denso 10-series compressor)

While specific specs for 447220-4771 can vary with sub-model and vehicle application, compressors in this family generally share common engineering attributes: a rotary vane or scroll/reciprocating architecture (depending on the exact 10S/10PA subtype), designed to operate with R-134a refrigerant (older units may be R-12 originally but most modern replacements are R-134a compatible), factory oil charge (often PAG46 or specified oil), and 12V or 24V electrical clutch coils depending on vehicle type. Displacement figures, mounting bolt patterns, and pulley/clutch geometry will be specific to the exact SKU. Catalog and parts sites commonly identify the 447220-4771 entry under Denso 10PA/10S compressor variants with build notes such as “direct mount,” “8-groove,” or similar designators. GeniussTech+1

Two practical technical details to call out: (1) oil type and charge — compressors are shipped with a factory oil charge; replacing a compressor without using the correct oil type or replacing/adjusting the oil level risks lubrication failure and premature seizure; (2) clutch pulley alignment and belt specs — incorrect groove counts or A-B distances (centerline to centerline distances) cause belt misrouting or slippage, leading to overheating or belt failure. When swapping compressors, technicians regularly measure clutch diameter, number of grooves, A-B distance, and electrical plug type to ensure the replacement is physically compatible. acparts.com

3. Common Applications and Fitments (Where 447220-4771 is used)

Public parts databases, aftermarket sellers and auction listings indicate that compressors with the 447220 series suffix are used in a range of vehicles: passenger cars, light commercial vehicles, buses, and even agricultural equipment such as Kubota tractors. Some aftermarket listings explicitly cite fitments for brands and models (e.g., Kubota tractors M8540, M9540 and certain DAIHATSU models for nearby part references), while other sources show Denso compressors of the same family used in Toyota, Nissan and Mazda vehicles in various years. The bottom line: the 447220-4771 variant is broadly applied, but exact vehicle compatibility must be confirmed by cross referencing engine model, year, and the compressor mounting/clutch configuration. Amazon+2Amazon+2

Because many fleets and repair shops service multiple vehicle brands, cross-reference charts are widely used to map the OEM compressor number found on the unit to Denso’s current catalog number and to compatible aftermarket SKUs. If your vehicle’s original compressor carried a number close to 447220-XXXX, there’s a chance the 447220-4771 is the correct modern replacement — but always verify with the vehicle VIN, the compressor’s printed tag, or the OEM parts manual. Retailers such as AC Parts, TruckAC, and specialized compressor sellers list exact fitment tables that are essential for accurate selection. acparts.com+1

4. OEM vs Remanufactured vs Aftermarket: Sourcing the Right Unit

When the time comes to replace an A/C compressor, buyers face three main categories: OEM (new Denso), remanufactured Denso (factory reman or authorized reman), and aftermarket generic units. Each has tradeoffs:

• OEM (new Denso): Usually the most expensive option but comes with factory specifications, correct oil charge, and warranty backing from Denso or its distributors. This is often the safest route for critical fleet vehicles or warranty repair work. acparts.com

• Remanufactured (Denso reman or reputable remanufacturers): A cost-effective middle path: the compressor has been disassembled, cleaned, worn parts replaced, and tested. Quality can be excellent if coming from an authorized remanufacturer with strict test procedures; ensure the reman is properly sealed and documented. Many repair shops use reman compressors to balance cost and reliability. truckac.com

• Aftermarket generic: Usually cheapest, but quality varies widely. Some aftermarket compressors are built to high standards and are compatible, while others are substandard copies that may have poor piston clearances, low-quality clutches, or inappropriate oil. If choosing aftermarket, buy from reputable sellers and verify compatibility and return policy. eBay+1

For Denso part 447220-4771 specifically, you’ll find listings for OEM Denso units, remanufactured units, and generics on marketplaces such as eBay and Amazon — always check the seller’s ratings, warranty length, and whether mounting hardware and orifice tubes/orings are included. eBay+1

5. Installation Best Practices — step-by-step considerations

Installing a vehicle A/C compressor is not a simple bolt-on job if you want a long service life. Below are the high-level best practices technicians follow when replacing a compressor such as the Denso 447220-4771; each paragraph below is intentionally detailed because cutting corners here is the main cause of early failure:

1. Diagnose correctly before replacement: Confirm the compressor is the source of the problem—listen for bearing noise, check clutch engagement voltage, and measure system pressures. Also inspect the condenser, receiver/drier (or accumulator), expansion valve/orifice tube, and for debris indicating previous failure. Replacing a compressor while leaving contaminated components in the circuit risks recontamination of the new unit.

2. Recover refrigerant legally and safely: Use an EPA-approved recovery machine to capture refrigerant from the system. In many jurisdictions releasing refrigerant to atmosphere is illegal. Once captured, determine whether to recycle/reclaim or start with a fresh charge depending on contamination levels.

3. Replace the filter/drier or accumulator: Always change the receiver/drier or accumulator when replacing a compressor. This component absorbs moisture and captures debris; if left old, it will quickly foul the new compressor.

4. Flush system if needed (with caution): If the old compressor has failed catastrophically (metal debris inside), many technicians flush the condenser and lines with approved solvents and tools, but flushing must be done per OEM recommendations — improper flushing can distribute debris or leave solvent residues.

5. Check and match oil charge and type: Ensure the replacement compressor has the correct type and amount of PAG oil or OEM specified lubricant. If the compressor does not come pre-charged, measure and add the exact oil volume. Some compressors require oil to be distributed between the condenser/lines and compressor by rotating the assembly and pulling vacuum.

6. Install using correct torque and alignment: Tighten mounting bolts to OEM torque specs and ensure pulley alignment so belts run true and don’t wear. Replace any worn belt tensioners or idlers.

7. Evacuate and vacuum the system: After installation, evacuate the system with a vacuum pump to remove air and moisture — typically pull 29 inHg (approx) for at least 30 minutes and check for pressure rise that could indicate leaks.

8. Charge with correct refrigerant and measure pressures: Use R-134a (or the OEM-specified refrigerant) and charge per the vehicle’s specified mass/pressure or weigh-in method; confirm proper high/low side pressures and verify temperature drop across the evaporator.

9. Run functional tests and leak checks: Cycle the compressor under load, check for unusual noises, verify clutch cycling and belt condition, and perform an electronic leak check or use UV dye if needed.

Detailed procedures vary by vehicle; always refer to the OEM repair manual for torque specs, oil types and capacities, and electrical connector pinouts. Denso and authorized distributors provide installation notes for many compressors similar to model 447220-4771. acparts.com+1

6. Common Failure Modes and Troubleshooting Tips

Compressor failures manifest in a few common ways: noisy bearings, seized compressor, electrical clutch failures, internal valve failure, or contamination from a previous failure. With Denso 10-series compressors (and variants like 447220-4771) technicians report common root causes including lack of lubrication (insufficient oil), contamination from a degraded clutch or previous component failure, blocked orifices causing high pressures, and electrical faults preventing clutch engagement. Here’s how to approach troubleshooting:

• Noisy compressor: If the compressor makes grinding or rumbling noises, check bearing health. A failing bearing often requires compressor replacement; in some reman programs the clutch/bearing assembly can be serviced separately, but many modern compressors are replaced as a unit.

• Clutch does not engage: Verify voltage at the clutch coil with A/C on; if voltage is present but clutch does not engage, the coil or clutch plate may be defective. If voltage is absent, check A/C pressure switches, relays, fuses, and the A/C control module.

• High discharge pressures and overheating: Could indicate a blocked condenser, low airflow (fan), overcharge, or a blocked expansion valve/orifice tube. Inspect condenser fins, fan operation, and measure system charge.

• System contamination after failure: If the old compressor failed catastrophically, assume debris is present — replace the receiver/drier, consider flushing, and replace the condenser if heavily contaminated. Metal debris will destroy a new compressor quickly.

• Slow cooling or weak output: Low refrigerant level/leak, worn compressor displacement reduction, or slipping clutch. Check for leaks with electronic sniffer or UV dye, measure suction/discharge pressures, and verify compressor sweeping function.

A methodical test plan — checking electrical, mechanical, and pressure elements — will quickly narrow the cause and help determine whether the compressor alone needs replacing or if ancillary parts also require service. Reels Media+1

7. Maintenance Practices to Maximize Lifespan

To get the longest service life from a Denso compressor like the 447220-4771, follow these maintenance habits:

• Maintain proper refrigerant level and quality: Low charge leads to higher internal temperatures and insufficient oil return; an overcharged system runs high pressures and stresses components. Periodically check system pressures and correct leaks promptly.

• Replace the receiver/drier/accumulator at first compressor service: As noted earlier, moisture and debris must be removed to avoid chemical breakdown and bearing corrosion.

• Ensure adequate condenser airflow: Clean or replace fans and fix shrouds — poor airflow causes higher head pressures that strain the compressor.

• Use correct oil and avoid mixing incompatible oils: Mixing oils (e.g., ester and PAG types) can cause oil thickening or poor lubrication. Follow OEM recommendations.

• Monitor belt and tensioner condition: A worn belt or misaligned pulley increases loads and can damage the clutch or compressor. Replace belts and tensioners per scheduled intervals.

• Run the A/C occasionally in winter: Running A/C circulates oil and keeps seals lubricated, which helps prevent seal drying and leakage during long idle periods.

A proactive maintenance mind set reduces surprise failures and extends component service life — particularly for heavy-use vehicles or off-road equipment where ambient dust and vibration accelerate wear. acparts.com

8. Environmental and Refrigerant Considerations

Compressor choice and service increasingly intersects with environmental regulation. Most modern units for light vehicles are designed for R-134a, but the automotive industry is shifting toward lower-GWP refrigerants (e.g., R-1234yf in newer passenger cars). When replacing a compressor, confirm the refrigerant type used in the system and avoid mixing refrigerants — this is both illegal in many jurisdictions and bad for system health. Reclaim and properly dispose of refrigerants during service using approved equipment. acparts.com

Additionally, responsible shops follow EPA (or regional equivalent) rules for refrigerant recovery and handling and use ultraviolet dye or tracer gases when diagnosing leaks, rather than venting refrigerants. Choosing remanufactured compressors also reduces waste by extending the life of existing components, aligning with sustainability goals — assuming remanufacturing is performed to strict quality standards. truckac.com

9. Pricing, Warranty and Where to Buy

Pricing for a replacement compressor varies widely: new OEM Denso units are typically the priciest but come with factory warranty; reman units offer a cost compromise; generic aftermarket units are lowest cost but variable quality. Marketplace listings show a broad price range depending on new/reman, inclusion of clutch/coils, and whether accessories (orings, manifold, receiver/drier) are bundled. Online retailers like ACParts, TruckAC, Amazon and eBay carry many listings for Denso-style compressors and part numbers around the 447220 series. For a critical system in a commercial vehicle, many professionals prefer an OEM or authorized reman with a reliable warranty rather than the cheapest option. eBay+2Amazon+2

Warranty terms differ: OEM units often carry longer coverage; remanufactured parts warranties depend on the remanufacturer’s testing and rebuilding standards. When buying, check whether the seller includes a core charge (refundable upon return of the old unit), shipping protections, and a clear returns policy. Purchasing through accredited distributors or dealer networks reduces the risk of counterfeit or mismatched units. truckac.com

10. Practical Case Studies — Real-world Scenarios Involving 447220-4771

To illustrate typical real-world situations where the 447220-4771 (or similar Denso compressors) is involved, consider the following scenarios:

• Owner of an agricultural tractor: A Kubota owner experiences loss of A/C in a tractor used for long days in the field. The tractor’s compressor tag matches a 447220 series number. The service team opts for a remanufactured compressor from a reputable supplier, replaces the receiver/drier and performs a system flush to remove metal debris from a failing clutch. After proper evacuation and charge, the tractor’s A/C returns to full capacity — an outcome achieved with lower cost than a new OEM unit and acceptable reliability because of the authorized reman program. Amazon+1

• Fleet bus with noisy compressor: A transit operator reports increased noise and poor cooling in a bus. Diagnostics show bearing failure in the compressor. Given high utilization, the operator purchases new OEM Denso compressors (with clutch and pulley matching A-B distances) and replaces condensers with preventive inspection. The buses return to service with warranty coverage essential for fleet uptime. Amazon+1

• Aftermarket buyer needing exact fitment: A DIY mechanic finds a Denso part number on the old compressor but discovers the marketplace offers several 447220 variants. By cross-referencing the VIN and the compressor tag, they locate the correct 447220-4771 SKU and purchase through an authorized parts distributor, avoiding the common pitfall of wrong pulley groove count that would have required returning the unit. eBay

These case studies emphasize the critical nature of correct identification and the value of choosing the right type of replacement (OEM vs reman vs aftermarket) for the application. acparts.com+1

Frequently Asked Questions (FAQ)

Q1 — Is Denso 447220-4771 an AC compressor for cars or heavy equipment?
The 447220-series compressors appear in multiple applications — passenger vehicles, light commercial vehicles, buses and off-road/agricultural equipment — depending on the sub-model. Always verify fitment using the vehicle VIN and the compressor’s stamped OEM number. Villetech+1

Q2 — Can I replace the compressor myself if I’m mechanically inclined?
You can, but it requires refrigerant recovery equipment, a vacuum pump, manifold gauges, correct oil type, and knowledge of flushing and leak testing. Many jurisdictions also legally require certified technicians to handle refrigerants. For DIYers, consider professional support for recovery/charge steps even if you perform mechanical installation. acparts.com

Q3 — What oil type does a Denso 447220-4771 use?
Most modern Denso compressors use PAG oil (often PAG46 or the manufacturer-specified grade). The exact oil type and volume depend on the compressor variant and vehicle; consult the compressor tag or OEM service data to avoid mixing incompatible lubricants. acparts.com

Q4 — How do I know if I need an OEM or remanufactured compressor?
If the vehicle is high-duty, under warranty, or critical to operations, OEM is safest. For budget conscious or non-critical uses, a factory-reman unit from an authorized remanufacturer can provide good reliability with cost savings. Avoid unknown generic units without proven quality records. truckac.com

Q5 — Are these compressors compatible with R-1234yf systems?
Most 447220 series listings and typical Denso 10-series compressors are R-134a spec. R-1234yf is a different refrigerant (and system design); retrofits require careful component compatibility checks and are best avoided unless specifically engineered for the replacement refrigerant. Always use the refrigerant specified by the vehicle manufacturer. acparts.com

Conclusion

The part number denso 447220-4771 is much more than a label: it represents an engineered assembly optimized to keep vehicle occupants comfortable while meeting mechanical, electrical, and environmental constraints. Whether you manage a fleet, maintain agricultural equipment, or service passenger cars, knowing how to decode a Denso part number, how to choose between OEM/reman/aftermarket options, and how to install and maintain compressors properly is fundamental to avoiding costly downtime and premature failures.

This guide has walked through the meaning behind the number, typical technical expectations, fitments, sourcing choices, installation best practices, common failure modes, maintenance habits, environmental and refrigerant considerations, pricing and warranty realities, and practical case scenarios — all grounded in supplier and parts-catalog sources so you can verify details for your exact application. For critical replacements, the single best practice is to cross-reference the old compressor’s tag, consult the vehicle OEM or Denso’s authorized distributor, and follow formal installation and refrigerant handling procedures. Doing so protects your investment, ensures safe operation, and keeps your A/C system cooling efficiently for years to come. truckac.com+3Villetech+3GeniussTech+3