TD5 Thermostats
TD5 thermostat assemblies for Defender TD5 and Discovery 2 TD5, with the same PEM100990 thermostat also fitted to Defender 2.4 and 2.2 TDCI models. Genuine Land Rover, MotoRad and EAC versions are available.
The Genuine Land Rover thermostat is the established best seller and the main starting point for this part. MotoRad provides a branded aftermarket alternative from a thermostat specialist, while EAC covers the price-led replacement position.
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Compare TD5 thermostat versions
All three thermostat assemblies replace PEM100990 and cover the same stated vehicle fitment. The main buying decision is the brand and quality position rather than a different vehicle application.
| Thermostat | Position | Best place to start |
|---|---|---|
| Genuine Land Rover thermostat | Genuine Land Rover boxed thermostat assembly and the established best-selling version. | The main starting point where the original Genuine Land Rover component is preferred. |
| MotoRad thermostat | Branded aftermarket thermostat from a specialist cooling and thermal-management manufacturer. | A quality-led branded aftermarket alternative to the Genuine Land Rover assembly. |
| EAC thermostat | EAC branded aftermarket thermostat assembly. | The price-led branded replacement within the current thermostat range. |
Check thermostat fitment before ordering
Match the thermostat against the vehicle, engine and PEM100990 part number. Slow warm-up and poor heater output are common reasons for replacing a thermostat, but overheating or unstable temperature can also involve coolant condition, trapped air, leaks, hoses or other cooling-system components.
TD5 fitment
Fits Defender TD5 and Discovery 2 TD5 models using thermostat PEM100990.
Fits Defender TD5 and Discovery 2 TD5 models using thermostat PEM100990.
Defender TDCI fitment
The same thermostat assembly fits Defender 2.4 and 2.2 TDCI models.
The same thermostat assembly fits Defender 2.4 and 2.2 TDCI models.
Part number
PEM100990 is the base Land Rover thermostat reference used across the three versions.
PEM100990 is the base Land Rover thermostat reference used across the three versions.
Cooling-system condition
Check coolant condition, hose condition, system bleeding and any signs of leakage or contamination during replacement.
Check coolant condition, hose condition, system bleeding and any signs of leakage or contamination during replacement.
Related cooling sections
| Section | Use it for |
|---|---|
| Defender cooling system parts | Radiators, water pumps, hoses, expansion tanks and other Defender cooling-system components. |
| Discovery 2 cooling parts | Discovery 2 radiators, hoses, water pumps, expansion tanks and related cooling parts. |
| TD5 thermostat guide | More detail on thermostat operation, temperature control and common fault symptoms. |
| Antifreeze and coolant | Replacement coolant for draining, refilling and bleeding the cooling system. |
