This type of thermostat provides broader and faster operation than traditional thermostats. In addition to the mechanical function of the wax bulb, map-controlled thermostats have an electric heater integrated into the sensor. The heater, controlled by the vehicle’s engine control unit, changes the temperature of the coolant according to the speed and load conditions of the engine. This temperature regulation is governed by a map stored in the engine control unit.

In partial load conditions (urban cycle), the thermostat stabilises the engine at a higher temperature to obtain benefits such good reaction kinetics, lower emissions and reduced friction (with a consequent reduction in consumption).

In full load conditions, the heater is activated to allow lower running temperatures and increase the power of the engine.