This Coolant / Heater Hose Adapter (Part No. 624091) is designed to provide a secure connection between the heater hose and the rear of the cylinder head on a wide range of classic Land Rover engines. This small but essential adaptor ensures proper coolant flow to the heater matrix and prevents leaks at one of the system’s most common failure points.
Manufactured to factory specifications, it is suitable for restoring or maintaining the cooling/heating system on Series, Defender, Discovery I, and Range Rover Classic 4-cylinder engine models.
Verified Fitment (Confirmed Across Multiple LR Specialists):
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Land Rover Series II, IIA, III – 4-cylinder models
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Defender – 4-cylinder engines (including 200Tdi & 300Tdi)
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Discovery I (1989–1998)
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Range Rover Classic (1992–1994, applicable 4-cyl / heater-hose adaptor use cases)
This adaptor is used on engines requiring a rear cylinder-head heater hose connection.
Supersession Part Numbers
No supersessions found.
FAQ
What does this adaptor do?
It connects the heater hose to the rear of the cylinder head, ensuring proper coolant flow to the heater system.
Does this fit both 200Tdi and 300Tdi engines?
Yes — when equipped with the heater-hose layout that uses this adaptor, both engines accept part 624091.
Is this a direct replacement?
Yes — it installs directly in place of the original coolant adaptor with no modifications required.
Part Number: 624091
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