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Professional installation recommended as it requires access to the fuel tank
This heater core return hose supplies coolant to the heater core
It ensures proper clutch disengagement and smooth shifting
Simple replacement with basic hand tools
Cross Reference 721903750
PIERBURG Air Pump Shut Off/Block Off Valve O Professional installation recommended as itThis PIERBURG air pump shut off block off valve is used in secondary air injection systems to control airflow during engine warm up. It requires a new gasket (part 11727505259) for installation. Designed as a direct OEM replacement, it helps maintain proper emissions system function. Key Features & Benefits Requires gasket: Sold separately, part number 11727505259. Direct OEM replacement: Meets PIERBURG quality standards. Controls secondary air flow:
