News, Knowledge, FJ40 LAND CRUISER, 80-Series Land Cruiser

Toyota Land Cruiser Radiator Cap Guide

Toyota Land Cruiser Radiator Cap Guide

Toyota Land Cruiser Radiator Cap Guide
SEE YEAR-MODEL DETAILS DOWN BELOW

Essential Cooling Component: Radiator Cap

Maintaining your Toyota Land Cruiser’s engine temperature is crucial for reliability and longevity, and that’s where the Radiator Cap steps in. This integral part ensures your cooling system operates efficiently by maintaining the correct pressure within it.


Why You Need a Reliable OEM Toyota Radiator Cap

The genuine Toyota Radiator Cap is more than just a cover for your radiator; it serves two critical functions. First, it keeps the cooling system sealed and pressurized, raising the coolant’s boiling point and helping prevent overheating. Second, it acts as a pressure-release valve that maintains system pressure while allowing excess pressure and heat to escape, thus safeguarding your Land Cruiser engine from damage that can arise from high-pressure levels.


How the Radiator Cap Works

The cap operates via a spring-loaded valve, which opens at a predefined pressure point. If the pressure in the cooling system exceeds the cap’s rating, the valve opens, allowing excess heat and coolant to flow into the overflow tank, thus preventing system failure.

Consequences of a Faulty Radiator Cap

If your Radiator Cap is broken or malfunctioning, it can lead to a series of problems. A leak in the cap can cause the cooling system to lose pressure, leading to lower boiling points and overheating. Additionally, air may enter the system, causing corrosion and reducing the cooling system’s efficiency.


Compatibility with Toyota Models

The right spare parts mean guaranteed performance and safety. The Radiator Cap is designed to fit perfectly with a range of Toyota models, ensuring your vehicle operates at its best.


FJ40 Cap Sub-Assy, Radiator 

1969: 16401-60040 < 16401-50010
1970: 16401-60040 < 16401-50010
1971 – 1972
16401-60040 (03/1969 – 10/1971) < 16401-50010
16407-60010 (11/1971 – 01/1974) < 16401-50010
1973: 16407-60010 < 16401-50010
1974 
16401-23070 (02/1974 – 12/1974) < 16401-50010
16407-60010 (11/1971 – 01/1974) < 16401-50010
1975: 16401-41020 (01/1975 – 01/1976) < 1640141021
1976: 16401-41020 (02/1976 – 06/1980) < 1640141021
1977: 16401-41020 (02/1976 – 06/1980) < 1640141021
1978: 16401-41020 (01/1975 – 07/1978) < 1640141021
1979
16401-41020(01/1975 – 07/1978) < 1640141021
16401-41021 (08/1978 – 06/1980)
1980: 1640141021 (08/1978 – 06/1980)
1981 – 1983 
1640141021 (08/1980 – 09/1981)
1640141021 (08/1980 – 08/1983)

80-Series Land Cruiser Radiator Caps

1991: 16401-71010 < 16401-54750
1992: 16401-71010 < 16401-54750 (01/1990 -07/1992)
1993: 16401-71010 < 16401-54750 (08/1992 – 12/1997)
1994: 16401-71010 < 16401-54750
1995: 16401-71010 < 16401-54750
1996: 16401-71010 < 16401-54750
LEXUS LX450 (11/1995-12/1997) 16401-54750

The radiator cap is a pressure-type cap that seals the radiator, resulting in a pressurization of the radiator as the coolant expands. The pressurization prevents the coolant from boiling even when the coolant temperature exceeds 100˚C / 212˚F. A relief valve (pressurization valve) and a vacuum valve (negative pressure valve) are built into the radiator cap. The relief valve opens and lets steam escape through the overflow pipe when the pressure generated inside the coolant system exceeds the limit (coolant temperature: 100 – 120˚C, 230 – 248˚F, pressure; 29.4 – 98.1 kPa, 0.3 – 1.0 kg/cm2, 4.3 – 14.2 psi). The valve opens to alleviate the vacuum that develops in the coolant system after the engine stops and the coolant temperature drops. The valve’s opening allows the pressure in the cooling system to return to the coolant in the reservoir tank.