Help protect your A/C compressor from abnormal refrigerant pressure with the Four Seasons switch 20963, a system-mounted trinary pressure switch. It fits many vehicles, among them the 1998-2005 Volkswagen Passat, 2001-2003 Audi S3 and 2001-2003 Audi S4, as a direct-fit replacement for the listed applications. See the "Vehicles it fits" section for the full list and engine details.
A trinary switch combines three pressure-sensing jobs in one unit. It is designed to cut compressor operation when refrigerant pressure is too low or too high, and to signal the cooling fan at an intermediate pressure. If a failed switch is the cause of warm air from the vents, a compressor that won't engage, or a fan that stays off with the A/C running, this switch replaces it.
- Zinc coated: the zinc coating helps the switch resist corrosion.
- Vehicle specific: made for vehicle-specific applications.
- Seals supplied: contains the gaskets, O-rings or seals needed to properly replace the switch.
- Color coded: for easy identification.
Four Seasons engineers and tests its products with the aim of providing years of trouble-free operation. The company draws on more than 50 years of mobile A/C experience.
Interchange: 1551035 · 8D0959482B · 207773 · 11120963 · 19188184 · 1711692 · A07773 · 301036 · MT0591 · SW11150 · SW11150C · URO009446 · 8D0959482A
This part cross-references / interchanges with the following part numbers:
1551035, 8D0959482B, 207773, 20963, 11120963, 19188184, 1711692, A07773, 301036, MT0591, SW11150, SW11150C, URO009446, 8D0959482A
Frequently Asked Questions
What does a trinary switch do in the A/C system?
It monitors refrigerant pressure. It is designed to cut compressor operation when pressure is too low or too high, and to signal the cooling fan at an intermediate pressure.
Is this S3 switch for the 2001-2003 Audi S3 also a fit for the 2001-2003 Audi S4 or 1998-2005 Volkswagen Passat?
Yes. Four Seasons 20963 fits the 2001-2003 Audi S3, the 2001-2003 Audi S4 and the 1998-2005 Volkswagen Passat. Many other models are listed in the "Vehicles it fits" section.
What comes in the box?
The trinary pressure switch, supplied with the gaskets, O-rings or seals needed to properly replace it.
What are signs the A/C trinary switch may need replacing?
Signs can include warm air from the vents, a compressor that won't engage or cycles erratically, or a cooling fan that doesn't run with the A/C on. Diagnose the system before replacing parts.
How do I install the switch?
Consult the vehicle service information for the procedure, including any refrigerant recovery and recharge. Follow proper refrigerant handling practices.
