Land Rover Discovery 2 Inline Kit
Tame Your D2's Overheat Demon
Conquer the #1 killer of Discovery 2 V8s – overheating – with our battle-tested Inline Thermostat Kit. Precision-engineered for seamless mid-hose install, it locks in consistent 180°F temps (or your choice), swaps out leaky factory plastic for bombproof alloy, and lets you service on the fly with zero drama. Backed by 45+ years of wrenching wisdom and near-zero returns, this mod's your ticket to worry-free wheeling, from urban crawls to overland epics. Dozens of 5-star reviews can't be wrong – tame the gremlins today.
Dig Deeper
- Top 10 Reasons an Inline Thermostat Beats the Factory Setup
- Blog Video Explainer: Quick visual on perks like no-stat runs and simplified bleeding
- Top Third-Party Install Guide: Over 16K views and real-world D2 swap
- Official Extinct Thread on Land Rover Forums: 40+ pages of owner installs and temp data
- Jump to Customer Reviews
- D2 Installation Instructions (PDF)
Click here to learn how to get combined shipping with an Extinct Motorsports order
- Availability:
- Usually ships within two days
- Bulk Pricing:
- Buy in bulk and save
- Buy 10 or above and get 10% off
Bulk discount rates
Below are the available bulk discount rates for each individual item when you purchase a certain amount
Special kit designed specifically to fit 99-04 Land Rover Discovery 2. Provides much more consistent temperature around selected thermostat setting. Improved reliability over factory system. Includes two paper gaskets, your choice of temperatures in one high quality thermostat, hose splice that goes in place of factory thermostat, bolts, and full instructions. Existing hose clamps and hoses are re-used. Thermostat delete option also available. Note: The sensor port up variant does not fit as tightly to the radiator shroud as the sensor port down variant does (see photos below). Sensor port up variant is for users who want to run an external temperature gauge.
Extra thermostat elements, re-usable silicone gasket, and/or extra paper gaskets available as spares. We highly recommend the re-usable silicone gasket as it allows the user to change thermostats easily with no RTV silicone and curing time, use immediately!

Normal, close fitting variant shown below (sensor port down).

Optional sensor port up variation shown below, for installation of temperature sensor.



Optional re-usable silicone gasket shown below - installation either side of thermostat acceptable.


How to get combined shippng with Extinct Motorsports Order and Inline Thermostats order
- Add Land Rover Inline Thermostat Kit combined shipping option to any product on Extinct Motorsports
- Complete product order and checkout at Extinct Motorsports
- Receive order confirmation email with combined shipping coupon code for combined shipping (free shipping on inline order)
- Order inline thermostat same day for coupon code to be valid
- Enter coupon code on checkout from inline thermostats for free shipping.