Please wait… 
Please wait while we process your order,
do not press the back button… 
Design911 Design 911 supply Porsche parts, Porsche spares and Porsche accessories, to both retail and to the trade. Our Porsche product and accessory range includes brakes, exhausts, tyres, wheels and Porsche panels and interiors. https://www.design911.co.uk/images/schemaLogo.png https://www.design911.co.uk/images/schemaLogo.png https://www.design911.co.uk Facebook Instagram
Check vehicle fitment
Special Order item
99110664
Product Information
Product Information
Replacement coolant hose - connects to centre radiator
This radiator coolant hose forms part of the high-performance engine cooling system, helping circulate coolant through the front centre radiator to maintain stable engine operating temperatures. Designed for the first-generation 991 GT cooling arrangement, it provides a replacement for cracked, leaking or deteriorated original radiator hoses. Available separately for the left or right side.

Fits:
Porsche 991.1 GT3 / GT3 RS / R 2014-18

*Please be advised, this part is only compatible with first generation GT3 / GT3 RS models. If you have a second generation GT3 or GT3 RS, or a 991 GT3 Touring or Speedster, you must order 99110664991 and/or (LEFT) 99110664891 (RIGHT).

Diagram ref no 6 and 7

What This Part Does
The centre radiator helps dissipate heat from the engine coolant, particularly during demanding driving conditions.

These hoses connect the centre radiator to the surrounding coolant pipework, allowing coolant to circulate through the cooling circuit.
A damaged hose can cause coolant leakage, pressure loss and reduced cooling efficiency.

Replacing a worn hose helps maintain reliable coolant circulation and protect the engine against overheating.

Common Reasons for Replacement
  • Coolant leaking from a radiator hose connection.
  • Cracked, split or deteriorated hose.
  • Low coolant warning.
  • Dried coolant residue around the front radiator.
  • Hose damage caused by road debris or impact.
  • Cooling system pressure loss.
  • Radiator replacement or cooling system refurbishment.
  • Preventative maintenance on a track-used vehicle.

Where It Fits on the Car
The hose is fitted within the front centre radiator assembly, behind the front bumper. Separate left-hand and right-hand hoses connect to the centre radiator and associated coolant pipework.




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Related, superseded, cross reference or alternative numbers for comparison.

99110664
99110664981
99110664881

The product you are viewing cross references to these numbers