Original Porsche Part Genuine Porsche part 99970185440

O-Ring, 19.6 X 3.53N.
The O-Ring 19.6 x 3.53N is a genuine Porsche OEM sealing ring designed to create a tight, leak-free seal between coolant pipe connections and related engine cooling system components. Manufactured to precise dimensions, this O-ring fits into the mating groove of the pipe joint to prevent coolant loss and maintain correct system pressure. It is an essential replacement seal used on various Porsche coolant and inlet pipe applications.

Fits:

• Porsche 957 Cayenne S/GTS 4.8L 2007-10
• Porsche 957 Cayenne Turbo / Turbo S 4.8L 2007-10
• Porsche 958 Cayenne S V8 4.8L Petrol 400HP 2010-17
• Porsche 958 Cayenne GTS V8 4.8L Petrol 400HP 2010-17
• Porsche 958 Cayenne Turbo V8 4.8L Petrol 500HP 2010-17
• Porsche 958 Cayenne Turbo S V8 4.8L Petrol 550HP 2010-17
• Porsche 970.1 Panamera V6 3.6L 2WD 2009-13
• Porsche 970.1 Panamera 4 V6 3.6L 4WD 2009-13
• Porsche 970.1 Panamera S V8 4.8L 2009-13
• Porsche 970.1 Panamera 4S V8 4.8L 2009-13
• Porsche 970.1 Panamera GTS V8 4.8L 2011-13
• Porsche 970.1 Panamera Turbo V8 4.8L 2009-13
• Porsche 970.1 Panamera Turbo S V8 4.8L 2009-13
• Porsche 970.2 Panamera V6 3.6L 2WD (310Hp) 2014-16
• Porsche 970.2 Panamera 4 V6 3.6L 4WD (310Hp) 2014-16
• Porsche 970.2 Panamera GTS V8 4.8L 4WD (440Hp) 2014-16
• Porsche 970.2 Panamera Turbo V8 4.8L (520Hp) 2014-16
• Porsche 970.2 Panamera Turbo V8 Executive 2014-16
• Porsche 970.2 Panamera Turbo S V8 4.8L 2014-16 

• Seals coolant pipe joints to prevent coolant leaks between connected pipes and fittings.
• Maintains correct cooling system pressure, which is essential for efficient engine temperature control.
  
• Creates a tight seal between metal components by compressing inside a groove when the pipe connection is tightened.

• Coolant may seep or drip from the joint where the O-ring seals the connection.
• A worn O-ring can cause slow coolant loss, leading to frequent topping up.
• Loss of coolant or system pressure can reduce cooling efficiency and contribute to overheating.
• A leaking O-ring often produces a noticeable coolant smell near the engine bay.
• The O-ring may show cracking, flattening (loss of shape), swelling, hardening or brittleness
  
• Modern Porsche models may trigger low coolant warnings if leakage occurs.

• Prevents coolant leaks at pipe connections, avoiding coolant loss and contamination.
• Maintains correct system pressure, which is essential for efficient engine cooling performance.
  
• Helps prevent engine overheating, since even a small leak can lead to low coolant levels and temperature rise.
  
• Protects surrounding components, as leaking coolant can damage hoses, sensors, connectors, and nearby engine parts.
  
• Ensures reliable long-term sealing, since old O-rings harden and flatten over time due to heat and pressure cycles.