RTC3607 - Radiator Cap – 9 lbs

- €4,20

€4,20

€4,20 - €4,20

€4,20

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Aftermarket: Quality alternative. This is a quality alternative, designed to fit and function like the original part, often at a more competitive price.

Radiator Cap seals the radiator filler neck and maintains the engine cooling circuit at its rated pressure.

Rated at 9 lb (0.62 bar), the spring-loaded valve raises the coolant boiling point and vents excess pressure to the overflow, then draws coolant back into the radiator as the system cools.

Vehicle Model Land Rover Defender up to 2016
Land Rover Series 2 and 3

Fitment Notes SERIES II/IIA/III — 9 lb radiator pressure cap
DEFENDER — 9 lb radiator pressure cap (early models)

Alternative Codes

RTC3607509767564713BR 1743GRC118RTC3610

In stock 14 units

9 · Gouda 5 · Drachten

Express delivery available

When will my order arrive?

Order before 15:00 (Mon–Fri): same-day dispatch for in-stock items.
UPS Express (order before 14:00): dispatched today, delivered tomorrow where available.
Netherlands / Belgium / Germany: 2–4 working days.
Other EU countries + UK: 4–8 working days.
Outside EU/UK: delivery times vary — contact us for an estimate.

Items may ship from multiple warehouses at no extra cost.

Job kits containing this part

This part is included in 2 job kit(s) below. Pick the kit that matches your vehicle and job, then add what you need.

Frequently asked questions

What does the RTC3607 radiator cap do, and why does the pressure rating matter?

The RTC3607 radiator cap seals the cooling system at the filler neck and holds it at 9 lb (0.62 bar). That pressure raises the coolant's boiling point, so the system runs hotter without losing coolant. A spring-loaded valve vents excess pressure to the overflow and draws coolant back in as the engine cools.

How do I know when the radiator cap needs replacing on a Series or Defender?

A failing radiator cap can't hold its rated 9 lb pressure. Signs include unexplained coolant loss, an overflow bottle that's always full or never refills, and overheating without an obvious leak. The cap's seal and spring degrade over time, so replacing it is usually the first step when diagnosing cooling system problems.

Which Land Rovers does the RTC3607 fit?

The RTC3607 fits Land Rover Series 2, Series 2A, and Series 3 with the 9 lb pressurised cooling system, and early Defender models rated at 9 lb. Cross-references include RTC3610, GRC118, and BR 1743.