Thermostat - 160°F 74°C - Summer - Bellows type
The original design of most older British cars called for a sleeve type thermostat which moves to blank off the coolant bypass port when the thermostat opens. This exact type of thermostat has not been available for many years. The amount of water that is allowed to bypass the radiator with modern replacement thermostats is enough to cause overheating in marginal engines. Early cars have large bypass ports, and cooling can be improved by installing our reproduction of the original style thermostat.