Nissens 840078 A/C Refrigerant Discharge Hose
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Nissens

Nissens 840078 A/C Refrigerant Discharge Hose

Brand Nissens 840078
Refrigerant Type R134a/r1234yf
Gasket Or Seal Included Yes
Discharge End Type P-nut fitting
Manifold Included No
Mounting Bracket Included No
Muffler Included No
Orifice Tube Included No
Service Port Included No
Suction End Type P-nut fitting
Fits Audi and Volkswagen · 61 vehicles

OE-spec hose assembly. Maintains proper refrigerant and lubricant flow between A/C components.

P-nut fittings. Both ends use P-nut connections for a secure hose assembly.

Seal included. Comes with a gasket or seal for a tighter connection.

Cross-references 5Q0816721AG, 5Q0816721C and 5Q0816721M for the same application. See all 4.

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Nissens A/C Discharge Hose 840078

The Nissens 840078 A/C refrigerant discharge hose is built for vehicles that need a direct replacement for the high-pressure line between air conditioning components. It is engineered to maintain proper refrigerant and lubricant flow in the system and is specified for R134A and R1234YF refrigerant applications.

Compatible with select Audi and Volkswagen models, this discharge hose is a practical OE-style solution for restoring A/C performance on vehicles such as the Audi A3, Audi S3, Volkswagen GTI, and Volkswagen Golf R. The Nissens 840078 is designed to meet or exceed OE specifications for fit and function.

Key Features

  • Part number: 840078
  • Refrigerant type: R134A / R1234YF
  • Discharge end type: P-nut fitting
  • Suction end type: P-nut fitting
  • Gasket or seal included
  • Direct replacement for the A/C refrigerant discharge line
  • Compatible with select Audi TT Quattro, TTS Quattro, A3, S3, and Volkswagen Golf-family applications

Detailed Description

Nissens A/C hose assemblies are built to support correct refrigerant circulation through the air conditioning system, helping connect the compressor discharge side to the next component in the circuit. This hose uses P-nut fittings on both ends and includes a gasket or seal for service-ready installation. It is listed for 2015-2023 Audi and Volkswagen applications, including the Audi A3, A3 Quattro, S3, TT Quattro, TTS Quattro, and Volkswagen Arteon, Golf, Golf Alltrack, Golf R, Golf SportWagen, and GTI. This part cross-references OE numbers 5Q0816721AG and 5Q0816721C for the same application.

What This Part Helps Solve

  • Refrigerant loss from a leaking discharge hose
  • Reduced A/C cooling caused by restricted refrigerant flow
  • Compressor-side hose failure from age, heat, or pressure cycling
  • Service issues on vehicles using R134A or R1234YF refrigerant
  • Fitment problems when replacing an OE-style discharge line on Audi A3 or Volkswagen Golf applications

Installation Notes and Tips

Verify refrigerant type, hose routing, and fitting style before installation. Replace the included seal during service and inspect mating surfaces, compressor connections, and adjacent A/C components for wear or contamination. Proper evacuation, leak testing, and recharge procedures are required after installation. Confirm vehicle-specific fitment for the exact Audi or Volkswagen model and year before ordering the Nissens 840078.

Quality Assurance

Nissens designs this hose assembly to meet or exceed OE specifications, with attention to correct flow characteristics and application-specific fitment. The part number 840078 is built as a direct replacement for the listed Audi and Volkswagen discharge line applications.

Related reading

This part fits 61 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersNotes
2023AudiTT Quattro——Discharge Line
2023AudiTTS Quattro——Discharge Line
2022AudiTT Quattro——Discharge Line
2022AudiTTS Quattro——Discharge Line
2021AudiTT Quattro——Discharge Line
2021AudiTTS Quattro——Discharge Line
2021VolkswagenArteon——Discharge Line
2020AudiA32.0LL4Discharge Line
2020AudiA3 Quattro——Discharge Line
2020AudiS3——Discharge Line
2020AudiTT Quattro——Discharge Line
2020AudiTTS Quattro——Discharge Line
2020VolkswagenArteon——Discharge Line
2019AudiA32.0LL4Discharge Line
2019AudiA3 Quattro——Discharge Line
2019AudiS3——Discharge Line
2019AudiTT Quattro——Discharge Line
2019AudiTTS Quattro——Discharge Line
2019VolkswagenArteon——Discharge Line
2019VolkswagenGolf2.0LL4Discharge Line
2019VolkswagenGolf Alltrack——Discharge Line
2019VolkswagenGolf R——Discharge Line
2019VolkswagenGolf SportWagen1.8LL4Discharge Line
2019VolkswagenGTI——Discharge Line
2018AudiA31.8LL4Discharge Line
2018AudiA3 Quattro——Discharge Line
2018AudiS3——Discharge Line
2018AudiTT Quattro——Discharge Line
2018AudiTTS Quattro——Discharge Line
2018VolkswagenGolf1.8LL4Discharge Line
2018VolkswagenGolf Alltrack——Discharge Line
2018VolkswagenGolf R——Discharge Line
2018VolkswagenGolf SportWagen——Discharge Line
2018VolkswagenGTI——Discharge Line
2017AudiA32.0LL4Discharge Line
2017AudiA3 Quattro——Discharge Line
2017AudiS3——Discharge Line
2017AudiTT Quattro——Discharge Line
2017AudiTTS Quattro——Discharge Line
2017VolkswagenGolf1.8LL4Discharge Line
2017VolkswagenGolf Alltrack——Discharge Line
2017VolkswagenGolf R——Discharge Line
2017VolkswagenGolf SportWagen——Discharge Line
2017VolkswagenGTI——Discharge Line
2016AudiA31.8LL4Discharge Line
2016AudiA3 Quattro——Discharge Line
2016AudiS3——Discharge Line
2016AudiTT2.0LL4Discharge Line
2016AudiTT Quattro——Discharge Line
2016AudiTTS Quattro——Discharge Line
2016VolkswagenGolf1.8LL4Discharge Line
2016VolkswagenGolf R——Discharge Line
2016VolkswagenGolf SportWagen——Discharge Line
2016VolkswagenGTI——Discharge Line
2015AudiA31.8LL4Discharge Line
2015AudiA3 Quattro——Discharge Line
2015AudiS3——Discharge Line
2015VolkswagenGolf1.8LL4Discharge Line
2015VolkswagenGolf R——Discharge Line
2015VolkswagenGolf SportWagen1.8LL4Discharge Line
2015VolkswagenGTI——Discharge Line
Directly replaces or cross-references 4 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
5Q0816721AG5Q0816721C5Q0816721M5Q0816721Q