Skip to content
8–23 August: reduced summer staffing. Orders may take up to 5 extra working days to dispatch and emails up to 2 working days to answer. Thanks for your patience.
8–23 Aug: orders may ship up to 5 days later.
ERR3479 - Thermostat Housing – 300TDi by Allmakes OEEngine Part Land Rover Range Rover Defender, Discovery, Range Rover

ERR3479 - Thermostat Housing – 300TDi

- €142,60
€142,60
€142,60 - €142,60
€142,60
OEM Part
OEM: Made by an Original Equipment Manufacturer. This part is made by an original equipment manufacturer or under their license, ensuring compatibility and quality.
Brand Allmakes OE
Thermostat Housing for the 2.5L 300TDi 4-cylinder turbo diesel engine.

This housing secures the engine thermostat within the cooling circuit and forms the junction between the engine coolant outlet, the upper radiator hose connection, and the bypass circuit. A cracked or leaking housing will cause coolant loss and disrupted thermostat operation. Replacement of the housing gasket and thermostat is recommended when refitting.
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 — 300TDi thermostat housing
DISCOVERY 1 1989-1998 — 300TDi, to VIN MA081992
RANGE ROVER CLASSIC 1992-1994 — 300TDi, from VIN JA610294
Alternative Codes
ERR3479

On order 1 unit · ETA 22-08-2026

Currently out of stock. Order now — we'll ship as soon as it arrives.

When will my order arrive?

We have 1 unit on order from our supplier, expected 22-08-2026. Order now to reserve — we'll dispatch as soon as stock arrives.

  • Netherlands / Belgium / Germany: 2–4 working days after dispatch.
  • Other EU countries + UK: 4–8 working days after dispatch.

Need it sooner? Contact us about express import (2–5 business days).

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 thermostat housing do on the 300Tdi?
The thermostat housing holds the thermostat in the cooling circuit of the 2.5L 300Tdi engine. It's the junction between the coolant outlet, the upper radiator hose connection and the bypass circuit, directing coolant flow as the thermostat opens and closes.
What are the signs a 300Tdi thermostat housing needs replacing?
A cracked or leaking thermostat housing causes coolant loss and disrupted thermostat operation, often showing as coolant weeping around the housing or an erratic running temperature. Renew the housing if it's cracked or the sealing faces are corroded.
Should anything else be replaced with the thermostat housing?
Replace the housing gasket and the thermostat when refitting the 300Tdi thermostat housing. The gasket won't reseal reliably once disturbed, and fitting a fresh thermostat while the housing is off avoids a second job later.
Which models does this thermostat housing fit?
It fits the Land Rover Defender, Discovery 1 (to VIN MA081992) and Range Rover Classic (from VIN JA610294) with the 300Tdi engine. Use your VIN to confirm fitment, as the Discovery 1 application changes after the listed VIN.

Frequently Bought With

Products most often purchased alongside this one.

1 items
ERR3490 - Thermostat Housing Gasket – 300TDi
Aftermarket

ERR3490 - Thermostat Housing Gasket – 300TDi

€1,40 excl. VAT