A/C Compressor 1K0-820-859-S
Neglecting the A/C compressor can lead to a variety of issues, including warm air blowing from vents, unusual noises when the system is running, or complete system failure. If the compressor shows signs of leakage or isn't cycling properly, it may be time for a replacement to restore climactic comfort effectively.
Choosing the OEM part number 1K0-820-859-S ensures the highest reliability and proper integration within the existing air conditioning system. This original component is manufactured to meet industry standards, reducing the chances of premature failure often seen with generic parts.
Available in Stores
| Seller | Price | Action |
|---|---|---|
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Leith Volkswagen
Official Dealer
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— |
| Seller | Price | Action |
|---|---|---|
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Volkswagen
New
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$1,065 $844 | |
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https://avtohype.com.ua/
New
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$62 | |
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Alexandria Volkswagen
New
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$1,100 |
| Seller | Price | Action |
|---|---|---|
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AVTOERA
Used
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$70 | |
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Алето Авто - оригинальні Б/У та нові оригінальні запчастини но авто з США
Used
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$99 | |
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M&S Auto Parts
Used
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$130 |
| Seller | Price | Action |
|---|---|---|
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Volkswagen of Downtown L.A.
New
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$1,099 $929 |
| Seller | Price | Action |
|---|---|---|
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507-683-858
New
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$44 | |
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507-683-858
New
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$44 | |
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Inter-Instal
New
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$29 |
Vehicle Fitment
Vehicles confirmed compatible with this part
No vehicle fitment information available for this part.
Technical Specifications
| OEM Part Number | 1K0-820-859-S |
|---|---|
| Compressor Model | DENSO 7SEU17C |
| Operating Voltage | 12V |
| Refrigerant Type | R134a |
| Oil Type | PAG 46 |
| Oil Capacity | 7 oz |
| Clutch Diameter | 100 mm |
| Fitting Style | Pad mount |
| Weight | ~12.55 lbs (5.7 kg) |
| Mounting Bolt Torque | 25 ± 2 Nm |
Built on the proven DENSO 7SEU17C compressor design, this unit meets Volkswagen Group factory specifications for refrigerant flow, pressure output, and durability across the full VAG compatibility range.
Pad-mount fitting style and 100 mm clutch diameter match the original installation exactly, requiring no modification to refrigerant lines, brackets, or electrical connectors during replacement.
Designed for 10–15 years or 150,000–250,000 km of service life under normal operating conditions, with no scheduled replacement interval when the A/C system is properly maintained.
Compatible Aftermarket Alternatives
The following aftermarket parts are confirmed direct equivalents for OEM 1K0-820-859-S, cross-referenced from major manufacturer catalogs.
| Manufacturer | Part Number | Notes | Dimensions (mm) |
|---|---|---|---|
| DENSO | DCP32045 | Direct aftermarket equivalent from the same manufacturer as the OEM unit; meets or exceeds factory specifications for the DENSO 7SEU17C platform. Recommended | 100 mm clutch diameter, pad mount |
| Nissens | 890632 | European aftermarket supplier with broad VAG fitment coverage; designed to OEM specification with PAG 46 oil compatibility. | — |
| Volkswagen OEM | 1K0-820-859-SX | Factory exchange/remanufactured unit carrying the original VW part number suffix 'X'; functionally identical to the new unit. | 100 mm clutch diameter, pad mount |
Always verify fitment against your VIN before ordering.
How to Replace the A/C Compressor
Replacing the 1K0820859S A/C compressor requires refrigerant recovery equipment and should be performed by a certified technician. The procedure involves safely discharging the system, removing the old compressor, installing the new unit, and professionally evacuating and recharging the A/C system with the correct refrigerant and oil quantities.
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Discharge the A/C System
Using certified refrigerant recovery equipment, safely recover all R134a refrigerant from the A/C system before beginning any work. This step is legally required and prevents environmental harm.
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Disconnect the Battery
Disconnect the negative battery terminal to eliminate any risk of electrical shorts while working near the compressor clutch connector and other wiring.
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Remove the Serpentine Belt
Release belt tension using the appropriate tensioner tool and remove the serpentine belt from the A/C compressor pulley. Set it aside if it will be reused.
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Disconnect Electrical and Refrigerant Lines
Unplug the compressor clutch electrical connector. Then detach the refrigerant line pad-mount fitting, removing the retaining bolt (torque: 22 ± 1 Nm on reinstall). Immediately cap both the line and compressor ports to prevent moisture and debris contamination.
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Remove Mounting Bolts and Extract Compressor
Remove all compressor mounting bolts securing the unit to the engine block. Carefully extract the compressor from the engine bay, noting its orientation for reinstallation reference.
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Install the New Compressor
Position the new 1K0820859S compressor and hand-thread all mounting bolts before torquing to 25 ± 2 Nm in a cross pattern. Reconnect the refrigerant line fitting and torque to 22 ± 1 Nm. Reconnect the electrical connector until it clicks.
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Reinstall Serpentine Belt
Route the serpentine belt over the compressor pulley per the belt routing diagram, then release the tensioner to apply correct belt tension.
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Evacuate and Recharge the A/C System
Using certified equipment, pull a deep vacuum on the A/C system to remove all air and moisture. Recharge with the correct quantity of R134a refrigerant and verify that PAG 46 oil is present at the specified 7 oz capacity. Reconnect the battery and test A/C operation.
Signs of a Worn Part
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Warm Air from Vents
The most common symptom — when the compressor fails to compress refrigerant adequately, the A/C system cannot cool the cabin and only ambient or warm air exits the vents even with A/C activated.
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Grinding or Squealing Noise
Unusual grinding or squealing sounds from the engine bay during A/C operation indicate worn internal compressor bearings or clutch components that require immediate attention to prevent total seizure.
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Visible Refrigerant Leaks or Oil Stains
Oil stains or oily residue around the compressor body or line fittings indicate a failing shaft seal or damaged fitting, causing refrigerant and PAG oil to escape the system.
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Compressor Clutch Not Engaging
If the electromagnetic clutch fails to engage when the A/C is switched on — evidenced by the clutch disc not spinning with the pulley — the compressor cannot function, resulting in no cooling.
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Intermittent A/C Performance
Cooling that cuts in and out unpredictably can signal an internally failing compressor, a slipping clutch, or low refrigerant caused by a slow leak at a compromised compressor seal.
Replacement Intervals
The A/C compressor has no fixed replacement schedule. Service life depends heavily on refrigerant charge integrity, oil condition, and whether the receiver-drier has been replaced when the system was previously opened. Address any A/C system leaks promptly to avoid running the compressor with insufficient lubrication.
Frequently Asked Questions
Is the 1K0820859S a new OEM part or a remanufactured unit?
The 1K0-820-859-S suffix designates a new OEM unit. The remanufactured/exchange variant carries the suffix 1K0-820-859-SX (the 'X' denotes an exchange core). Both are functionally identical, but the exchange unit typically requires a core return.
What vehicles does the 1K0820859S fit?
Confirmed fitments include the VW Golf V (1K1), VW Beetle (2012–2015), VW Tiguan, Audi A3 (2006–2007), and SEAT Leon (1P1). Compatibility varies by engine type and production date — always verify using your vehicle's VIN before purchasing.
Do I need to replace the receiver-drier when replacing this compressor?
Yes. Industry best practice requires replacing the receiver-drier (or accumulator) any time the A/C system is opened. The drier's desiccant becomes saturated with moisture once exposed to air and will no longer protect the new compressor from contamination.
What refrigerant and oil does this compressor use?
This compressor uses R134a refrigerant and PAG 46 compressor oil at a specified capacity of 7 oz. Using the wrong oil type or quantity will void any warranty and can cause premature compressor failure.
Can I replace the 1K0820859S myself without a shop?
Recovering and recharging refrigerant requires EPA Section 609-certified equipment and is illegal to vent to atmosphere. While the mechanical removal and installation can be DIY-performed, the refrigerant handling steps must be performed by a certified technician or shop.
Are DENSO DCP32045 and Nissens 890632 reliable alternatives to the OEM part?
Yes. DENSO is the original manufacturer of the OEM compressor and their DCP32045 is a direct equivalent built to the same specifications — it is the recommended aftermarket choice. Nissens is a reputable European supplier and their 890632 is also a validated direct replacement.
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