Land Rover Water Pumps, Thermostats & Fans

What do Land Rover water pumps, thermostats and cooling fans do?

Water pumps, thermostats and cooling fans work as one circuit. The water pump circulates coolant through the engine and radiator, the thermostat controls how much of that coolant passes to the radiator according to coolant temperature, and the fan draws air through the radiator when airflow from road speed is not enough. Each depends on the other two to keep coolant within the temperature range the engine is designed for, which is why they sit together here inside Land Rover Cooling & Heating Parts, alongside the radiators, hoses and oil coolers.

Parts here fit the Land Rover Defender, Land Rover Series, Land Rover Discovery, Land Rover Freelander and Range Rover families. Listings are titled by part number, and the Land Rover parts catalogues are the place to confirm the original number for your vehicle before ordering.

Water pumps by engine: 300Tdi, Td5, Rover V8, 2.7 TDV6 and 2.2 TD4

The pumps for the engines below are mechanical, belt-driven pumps, but the belt that drives them and the way they seal differ by engine, and both affect what else to check when ordering.

• 300Tdi. Driven by the auxiliary drive belt, not the timing belt. The pump seals to its auxiliary mounting bracket with a flat gasket that has its own part number, ERR3284, and the workshop manual fits a new gasket when the pump is refitted.
• Td5. Mounted behind the power steering pump and driven by the auxiliary belt. The pump seals with O-rings rather than a flat gasket, and the workshop manual fits new O-rings to the pump and its cover on refit.
• Rover V8. On the Discovery 1 and Range Rover Classic from the 1995 model year, the belt-driven water pump sits in the engine front cover and the viscous fan is driven from the water pump spindle. On the Range Rover P38 V8 up to the 1999 model year, the workshop manual's cooling layout shows the viscous fan and water pump together. The gasket is a separate part, ERR2428 or ERR4077 depending on engine and build. On the Discovery 1 and Range Rover Classic the pump pulley changed at the 1995 model year with the move to a serpentine belt: Discovery 1 cars up to 1994 and Range Rover Classics from 1986 to 1994 with air conditioning use pulley ETC5422, and 1995 onwards cars use PQR101050.
• 2.7 TDV6. On the Discovery 3 the coolant pump runs on the accessory drive belt, with a pulley bolted to the pump and an O-ring seal. It is not part of the timing belt drive, so a timing belt job does not automatically include it.
• Freelander 2 2.2 TD4 (DW12). The water pump is driven by the timing belt, and timing belt kits for this engine are offered with the pump and its seal included, so check whether a kit already contains the pump before ordering one separately.

Pumps for the Ingenium and 3.0 TDV6 engines are listed by part number. Some Range Rover L405 and Range Rover Sport L494 vehicles also carry an auxiliary coolant pump, and auxiliary coolant pumps are listed in this collection by part number. Drive belts are listed under Land Rover Engine Parts; on the 300Tdi, Td5 and Discovery 3 2.7 TDV6 the auxiliary belt is worth checking while the pump is off.

Thermostats and housings: 300Tdi, Td5, 2.7 TDV6 and Freelander 2

Thermostats differ by engine in three ways: the opening temperature, whether the thermostat is sold alone or inside a housing, and how it seals. Opening temperatures for the engines where the workshop manuals give a clear figure are in the questions at the foot of this page.

• 300Tdi. The thermostat and the thermostat housing gasket are separate parts; the gasket is ERR3490.
• Td5. The thermostat sits in a remote housing behind the radiator rather than in the cylinder head outlet. Catalogues list the housing and thermostat as one assembly, PEM100990, for the Defender Td5 and early Discovery 2 Td5; on later Discovery 2 vehicles, confirm the part against the VIN.
• 2.7 and 3.0 TDV6. The two engines use different thermostat and gasket part numbers. On the 2.7 the housing gasket, 1341370, is a separate part from the thermostat.
• Freelander 2 2.2 TD4. The thermostat is part of a thermal control module at the rear of the cylinder head, which also carries the coolant temperature sensor and seals with an O-ring.
• Defender 2.4 Puma. In the 2007 model year workshop manual, the thermostat sits in the bottom hose assembly on the inlet side.

The Discovery 4 thermostat housing guide below covers what to replace with that housing; this page lists the parts.

Cooling fans: viscous couplings on the 300Tdi, Td5 and Discovery 3, electric fans on the Freelander 2

The fan arrangement depends on the engine, and the parts differ with it.

• Engine-driven viscous fan. On the 300Tdi, the Defender workshop manual places the viscous fan on an independent pulley secured to the front cover plate. On the Td5, the Defender workshop manual places the viscous fan on an idler pulley at the front of the engine, driven by the auxiliary belt. The Rover V8 in the Discovery 1 and Range Rover Classic from the 1995 model year has a belt-driven viscous fan driven from the water pump spindle. The Discovery 3 2.7 TDV6 has a viscous fan on a left-hand thread.
• Viscous fan with electric condenser fans. Air conditioning adds electric condenser fans alongside the viscous fan on several models. On an air-conditioned Discovery 2 Td5 the engine management runs them whenever the compressor is engaged and also when coolant temperature is high, and the Range Rover P38 V8 up to the 1999 model year has them as well as its viscous fan.
• Electric radiator fans. The Freelander 1 KV6 uses electronically controlled electric cooling fans, and the Freelander 2 2.2 TD4 and the Discovery Sport 2.2 diesel and 2.0 petrol are catalogued with an electric radiator fan and motor assembly.

Viscous couplings, cooling fans, cowls, shrouds, electric fan motors and fan assemblies are listed as separate parts.

Fan spanners are listed under Land Rover Workshop Tools.

Buying guide: Genuine, OEM and aftermarket cooling parts

Genuine water pumps, thermostats and cooling fans carry the Land Rover part number. OEM or OES water pumps, thermostats and cooling fans come from original-equipment manufacturers or recognised OE suppliers, and brands such as Pierburg, Mahle and Bearmach may appear as OE, OES or aftermarket depending on the specific item. Aftermarket also covers independent replacement brands.

Budget Parts lists Genuine, OEM and aftermarket parts in this collection, and which tiers exist differs from part to part. For thermostats, check the specification before the tier: the opening temperature determines when the thermostat begins to regulate coolant flow to the radiator, so a thermostat at the wrong rating is the wrong part whichever tier it comes from.

Ordering together. The system is drained, at least partly, to change a pump or a thermostat, so coolant of the correct specification is needed to refill it. Viscous couplings and cooling fans are listed separately.

Before you order

1. Confirm the engine code. It is the first fitment check; the model year or VIN settles a part that changed during a generation.
2. On a Rover V8 Discovery 1 or Range Rover Classic, confirm the model year and air conditioning before ordering a pump pulley. The pulley changed at the 1995 model year.
3. Check the seal. For the engines it covers, the water pump section above shows whether the pump seals with a gasket or with O-rings. Check the individual listing to see whether the required gasket or O-rings are included.
4. Check the thermostat rating against your engine's specification.
5. Quote the VIN with any fitment enquiry. Give the full VIN or chassis number exactly as it appears on the vehicle. It is how a part number that changed mid-generation is checked against your vehicle.

Fitment by model: Series 1 to Range Rover Velar

Every model with parts in this collection is listed below. The three right-hand columns show which product groups are listed for that model today; "Not listed" means this collection holds no parts in that group for that model at present.

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