1Vehicle Compatibility: Compatible with for Navigator 19982006, for Expedition 19972006, please check carefully to make sure it is compatible with your vehicle. 2Powerful Function: Prevents refrigerant flow to rear AC unit and only uses front AC unit, commonly used to bypass leaking rear lines and restore normal AC working from front unit. 3High Durability: The rear AC block off kit offers excellent durability. It's made from rubber and aluminum, ensuring resistance to aging and wear and tear. 4Enhanced Performance: With this kit, you can bypass the problem area and maintain normal AC operation, guaranteeing reliable and consistent performance. 5Simple Installation: Easy and quick to install, without complex and professional steps, directly replace the old parts, convenient for using, saving your time and effort. 1 x Rear AC Block Off Kit(4PCS)