Radiator Coolant Vent Line, LEFT. Porsche 991.1 / 981 Boxster / 981C Cayman  ❭  99110676502

Ensure proper cooling system operation with the Radiator Coolant Vent Line, LEFT. This OE MATCH vent line is designed to help remove trapped air from the radiator cooling circuit, supporting consistent coolant circulation and stable engine temperature control.

Fits:

• Porsche Boxster 981 2.7L 2012-16
• Porsche Boxster 981 S / GTS 3.4L 2012-16
• Porsche 991.1 Carrera C2 3.4L (350 Bhp) 2012-16
• Porsche 991.1 Carrera C2S / GTS 3.8L (400/430 Bhp) 2012-16
• Porsche 991.1 Carrera C4 3.4L (350 Bhp) 2012-16
• Porsche 991.1 Carrera C4S / GTS 3.8L (400/430 Bhp) 2012-16
• Porsche Cayman 2.7L 981 2013-16
• Porsche Cayman S / GTS 3.4L 981 2013-16
• Porsche Cayman GT4 3.8L 2015-16  

• Vents air from the radiator cooling system
• Prevents air pockets that can restrict coolant flow
• Supports consistent coolant circulation
• Helps maintain stable engine operating temperature
• Reduces the risk of overheating

• Coolant leaks near the radiator or along the vent line
  
• Low coolant warning light or frequent coolant top-offs
  
• Sweet coolant smell from the front of the vehicle
  
• Coolant residue or staining around fittings or connections
  
• Cracked, brittle, or leaking vent line material
• Air trapped in the cooling system, causing gurgling sounds
  
• Fluctuating engine temperature or inconsistent gauge readings
  
• Overheating, especially after coolant service or refilling
  
• Steam from under the hood in severe cases