Breather Hose - Coolant Reservoir Filler Neck. Porsche 718 (982) Boxster & Cayman 2.0L / 2.5L 2017>>  ❭  982121533F

Breather Hose - Coolant Reservoir Filler Neck.

Maintain proper cooling system ventilation and reservoir performance with the Breather Hose – Coolant Reservoir Filler Neck. This OE MATCH breather hose connects to the coolant reservoir filler neck, allowing excess air and vapor to vent correctly as coolant expands and contracts during normal engine operation.

Fits:

• Porsche Boxster 718 2.0L Manual (300 Bhp) 2017>>
• Porsche Boxster 718 2.0L PDK (300 Bhp) 2017>>
• Porsche Boxster S 718 2.5L Manual (350 Bhp) 05/2017>>
• Porsche Boxster S 718 2.5L PDK (350 Bhp) 05/2017>>
• Porsche Boxster T 718 2.0L Manual (300 Bhp) 01/2019>>
• Porsche Boxster T 718 2.0L PDK (300 Bhp) 01/2019>>
• Porsche Boxster GTS 718 2.5L Manual (365 Bhp) 05/2017>>
• Porsche Boxster GTS 718 2.5L PDK (365 Bhp) 05/2017>>
• Porsche Cayman 718 2.0L Manual (300 Bhp)
• Porsche Cayman 718 2.0L PDK (300 Bhp)
• Porsche Cayman S 718 2.5L Manual (350 Bhp)
• Porsche Cayman S 718 2.5L PDK (350 Bhp)
• Porsche Cayman T 718 2.0L Manual (300 Bhp)
• Porsche Cayman T 718 2.0L PDK (300 Bhp)
• Porsche Cayman GTS 718 2.5L Manual (365 Bhp)
• Porsche Cayman GTS 718 2.5L PDK (365 Bhp) 

Diagram Ref No 11

What This Product Does:

• Vents trapped air from the coolant reservoir area
• Helps regulate cooling system pressure as coolant expands and contracts
• Prevents pressure buildup that can cause leaks or hose damage
• Supports proper coolant reservoir and cooling system performance

Symptoms Of Wear Or Failure:

• Coolant leaks near the reservoir filler neck
  
• Sweet coolant smell from the engine bay
  
• Coolant residue or staining around hose connections
  
• Cracked, brittle, or hardened hose material
• Collapsed or kinked hose restricting proper venting
  
• Pressure buildup in the cooling system
• Swollen hoses due to improper ventilation
  
• Low coolant warning light if leaks develop
  
  

Why Replacement Matters:

• Replacing a worn breather hose is important because it helps the coolant reservoir vent properly and maintain correct cooling system pressure. Over time, heat and coolant exposure can cause the hose to become brittle, cracked, or restricted.
• If the hose fails, it may lead to coolant leaks, pressure buildup, and added strain on surrounding hoses, seals, and the reservoir itself. Poor ventilation can also reduce cooling system efficiency and increase the risk of overheating.
• Installing a new breather hose helps restore proper venting, prevent leaks, and protect the engine by keeping the cooling system operating reliably.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

982121533F

The product you are viewing cross references to these numbers