PCH500040 In/Out Heater Hose – Discovery Series II

Restore proper coolant flow to your heater core with this In/Out Heater Hose (Part No. PCH500040) for the Discovery Series II. This molded hose maintains the correct routing between the engine and heater core, ensuring reliable cabin heat and preventing coolant leaks.

Constructed from durable, heat-resistant rubber, it replaces cracked, swollen, or leaking factory hoses—an essential maintenance item for aging cooling systems on the L318 Discovery II.

Fits:
Discovery Series II (1999–2004, L318)

Install tip: Always replace coolant clamps and top off with the correct OAT coolant after installation. Bleed the system thoroughly to prevent trapped air.

Supersession Part Numbers
No supersessions found.

FAQ

Is this the supply or return heater hose?
This hose is designed for both the inlet and outlet path, matching the original PCH500040 specification for the D2.

Should I replace both heater hoses at once?
Yes — replacing all heater hoses together ensures even wear and reduces risk of future leaks.

Do I need special tools?
Standard hand tools work. Ensure the cooling system is cool before removing hoses.

Part Number: PCH500040

Free Shipping Available to the Lower 48