1 set coolant hoses Genuine Porsche part PAB121036A

Water Pump Kit for Porsche 9YA Cayenne & 971 Panamera 4.0-Litre V8 Engines (Including Hybrid Models)

This water pump kit is designed for Porsche vehicles equipped with the 4.0-litre V8 engine, including the 9YA Cayenne and 971 Panamera, covering both petrol and Hybrid variants. The kit includes a new water pump, thermostat, and sealing ring, providing a complete and reliable solution for cooling system servicing or repair.

Fits:

• Porsche 9YA Cayenne GTS V8 4.0L Petrol 460Hp 2020-23
• Porsche 9YA Cayenne Coupe GTS V8 4.0L Petrol 460Hp 2021-23
• Porsche 9YA Cayenne Turbo V8 4.0L Petrol 550Hp 2020-23
• Porsche 9YA Cayenne Coupe Turbo V8 4.0L Petrol 550Hp 2019-23
• Porsche 9YA Cayenne Turbo S E-Hybrid V8 4.0L 550Hp 2019-23
• Porsche 9YA Cayenne Coupe Turbo S E-Hybrid V8 4.0L 550Hp 2020-23
• Porsche 9YA Cayenne Coupe Turbo GT V8 4.0L 640Hp 2021-23
• Porsche 971.1 Panamera Turbo V8 4.0L 4WD (550 Hp) 2017-20
• Porsche 971.1 Panamera Turbo V8 4.0L 4WD Executive 2017-20
• Porsche 971.1 Panamera Turbo 4.0L Twin-Turbo V8 Sport Turismo 2017-20
• Porsche 971.1 Panamera Turbo S E-Hybrid V8 4.0L 4WD 2017-20
• Porsche 971.1 Panamera Turbo S E-Hybrid V8 4.0L 4WD Executive 2017-20
• Porsche 971.2 Panamera GTS 4.0L V8 2021-23
• Porsche 971.2 Panamera GTS Sport Turismo 4.0L V8 2021-23
• Porsche 971.2 Panamera Turbo S 4.0L V8 2021-23
• Porsche 971.2 Panamera Turbo S Sport Turismo 4.0L V8 2021-23
• Porsche 971.2 Panamera Turbo S E-Hybrid 4.0L V8 2021-23
• Porsche 971.2 Panamera Turbo S E-Hybrid Sport Turismo 4.0L V8 2021-23

High-output V8 engines generate significant thermal load, especially in performance and hybrid applications where electric assistance and regeneration add further heat demand. The water pump circulates coolant through the engine and cooling circuits, while the thermostat precisely regulates operating temperature. Replacing these components together ensures stable thermal control, prevents coolant leaks and protects critical engine and hybrid system components.

What This Water Pump Kit Does

This complete cooling system kit:

• Restores efficient coolant circulation throughout the V8 engine
  
• Maintains stable operating temperature with a new thermostat
  
• Ensures leak-free sealing using a new thermostat seal
  
• Supports hybrid thermal management systems where fitted
  
• Improves cooling efficiency under high load and performance driving
• Helps prevent overheating and warning messages

Ideal for preventative maintenance or when addressing cooling-related faults on Porsche V8 platforms.

Why Water Pumps & Thermostats Fail on Porsche 4.0 V8 Engines

Common causes include:

• Internal bearing wear within the water pump
  
• Thermostat sticking or delayed response, affecting temperature control
  
• High operating temperatures from twin-turbo V8 performance
  
• Thermal cycling, accelerating seal and housing fatigue
  
• Coolant contamination, leading to internal wear
  
• Age and mileage, particularly on performance and hybrid models

Failure symptoms may include coolant leaks, fluctuating temperatures, reduced performance or engine warning alerts.

Why the Water Pump & Thermostat Should Be Replaced Together

Replacing both components as a matched kit offers:

• Balanced service life across cooling components
• Correct coolant flow and temperature regulation from installation
• Reduced labour costs compared to separate replacement
  
• Lower risk of repeat cooling system failures
• Improved long-term reliability, especially for high-performance V8 engines

This approach ensures the cooling system performs exactly as intended under all conditions.