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ERR3291W - Thermostat - 77 78 Degree by AllmakesCooling or Heating Part Land Rover Range Rover Defender, Discovery

ERR3291W - Thermostat - 77 78 Degree

- €13,80
€13,80
€13,80 - €13,80
€13,80
Aftermarket Part
Aftermarket: Quality alternative. This is a quality alternative, designed to fit and function like the original part, often at a more competitive price.
Thermostat for the 2.5L 300TDi diesel engine, operating within the thermostat housing at the top of the cooling circuit.

The thermostat regulates coolant flow between the engine and the radiator based on coolant temperature. Below the opening threshold, coolant is directed through the bypass circuit to accelerate warm-up and maintain consistent operating temperature; once the thermostat opens, it allows full coolant circulation through the radiator.
Vehicle Model Land Rover Defender up to 2016
Land Rover Discovery 1 1989-1998 (L318)
Range Rover Classic up to 1994
Fitment Notes DEFENDER 1987-2006 — 2.5L I4 300TDi Diesel Turbo — 77/78°C uprated (cooler) thermostat
DISCOVERY 1 1989-1998 — 2.5L 300TDi (to VIN MA081992) — 77/78°C uprated (cooler) thermostat
RANGE ROVER CLASSIC 1992-1994 — 2.5L TDi (from VIN JA610294) — 77/78°C uprated (cooler) thermostat
Alternative Codes
ERR3291WERR3291

In stock 5 units
5 · Gouda 0 · 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 0 job kit(s) below. Pick the kit that matches your vehicle and job, then add what you need.

Frequently asked questions

What does the ERR3291W thermostat do?
The ERR3291W is a 77/78°C uprated thermostat for the 2.5L 300Tdi diesel, fitted in the housing at the top of the cooling circuit. It regulates coolant flow between the engine and radiator, directing coolant through the bypass circuit until it reaches its opening temperature.
Which vehicles fit the ERR3291W thermostat?
It fits the Defender (1987-2006), Discovery 1 (to VIN MA081992), and Range Rover Classic (from VIN JA610294), all with the 2.5L 300Tdi engine.
Why is the ERR3291W described as an uprated thermostat?
It opens at a lower 77/78°C compared with the standard thermostat rating, giving slightly cooler running under load. This is a common upgrade on 300Tdi engines that see hard use or towing.
What happens if the ERR3291W thermostat fails?
A thermostat stuck closed causes rapid overheating, while one stuck open means the engine runs cold and never reaches proper operating temperature. Either fault is a common reason for inconsistent temperature gauge readings on the 300Tdi.

Alternative & Related Options

Same part, different brands or quality grades. Click any option to view full details.

2 options
ERR3291 - Thermostat – 300TDi – 88C
Aftermarket ERR3291 - Thermostat – 300TDi – 88C
Stock 13
€10,40 excl. VAT
View →
No image
OEM ERR3291LUCAS - Thermostat – 300TDi – 88C
Stock 0
€31,80 excl. VAT
View →

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