ETC4765 Thermostat V8 Defender Discovery Range Rover
The thermostat is one of the hardest-working and most overlooked components in your Rover's cooling system. It regulates engine operating temperature by controlling when coolant is allowed to flow from the engine to the radiator, and a failing thermostat can cause overheating, poor fuel economy, and premature wear on engine components. This listing offers the ETC4765 thermostat for all Rover V8-powered Defenders, Discovery I models, and Range Rover Classics.
The standard replacement thermostat opens at 88°C (190°F), matching the factory operating specification for these V8 engines. For owners who want additional thermal headroom, particularly those running in hot climates or doing extended low-speed off-road work, the FLOWKOOLER ETC4765-LOW is also available as a variant. This low-temperature thermostat opens at 82°C (180°F), allowing coolant to circulate to the radiator earlier in the cycle and keeping operating temperatures lower during demanding use. Both thermostats are direct-fit replacements for the same housing and install using the same gasket and procedure.
The thermostat gasket ERR2429 is available as a standalone option for those who already have a thermostat on hand, and a combined kit of the standard aftermarket thermostat and gasket or low temp thermostat and gasket together is offered for a complete kit. The ERR2429 gasket seals the thermostat housing and should always be replaced whenever the thermostat is serviced. Reusing an old gasket risks a coolant leak at the housing joint that can lead to overheating.
Fits:
Defender 90 (all years) 3.5-liter and 3.9-liter Rover V8 Petrol/Gas
Defender 90 NAS (1994 to 1997) 3.5-liter and 3.9-liter Rover V8 Petrol/Gas
Defender 110 (all years) 3.5-liter and 3.9-liter Rover V8 Petrol/Gas
Defender 110 NAS (1993) 3.5-liter and 3.9-liter Rover V8 Petrol/Gas
Defender 130 (all years) 3.5-liter and 3.9-liter Rover V8 Petrol/Gas
Discovery I L318 (1994 to 1999) 3.9-liter and 4.0-liter Rover V8 Petrol/Gas
Range Rover Classic (all years) 3.5-liter and 3.9-liter Rover V8 Petrol/Gas
Part Number: ETC4765/ERR2429
FREE SHIPPING TO THE LOWER 48!
FAQ
What options are available from the variant dropdown?
This listing offers five options: the standard aftermarket ETC4765 thermostat on its own, the thermostat gasket ERR2429 on its own, a combined kit with both the standard thermostat and gasket together, the FLOWKOOLER ETC4765-LOW 180°F (82°C) low temperature thermostat or the low temp thermostat and gasket kit for owners who prefer a cooler running engine.
What is the difference between the standard thermostat and the FLOWKOOLER low-temp option?
The standard ETC4765 thermostat opens at 88°C (190°F), which is the factory specification for these Rover V8 engines. The FLOWKOOLER ETC4765-LOW opens at 82°C (180°F), allowing coolant to reach the radiator sooner and keeping engine temperatures lower. The lower-opening thermostat is particularly popular with owners in hot climates or those doing extended low-speed off-road driving where heat builds more aggressively.
Do I need to replace the gasket when I change the thermostat?
Yes. The ERR2429 thermostat housing gasket should be replaced any time the thermostat is removed. Reusing a compressed or aged gasket risks a coolant leak at the housing joint, which can lead to overheating and further engine damage. The combined kit option in the dropdown includes both the standard thermostat and the ERR2429 gasket together for a complete service in one order.
