Motor Electronics Cooling System (MECS)

The vehicle uses a pump driven cooling system, referred to as the Motor Electronics Cooling System (MECS) pump, to transfer heat generated by the Electronically Controlled Continuously Variable Transmission (eCVT) and the Hybrid Electric Vehicle (HEV) DC/DC converter to the atmosphere. The system uses a coolant-to-air radiator design.

The MECS  pump is an electric pump that runs any time the ignition is in the ON position. Unlike traditional cooling systems, there is no thermostat in the MECS  , so coolant flow should be continuous and considerably less than traditional powertrain cooling systems.

The flow direction is from the degas bottle and DC/DC converter to the MECS  pump through the eCVT  , then through the MECS  radiator from the LH to RH side of the vehicle back to the degas bottle.

The MECS  cooling pump will make an audible noise if it is running and a slight vibration may be felt by touch. Flow can be verified by visually inspecting for coolant flow into the degas bottle. Flow can be viewed easily in the degas bottle by holding a light source behind the degas bottle. Only a portion of the coolant flow is diverted to the degas bottle via the "T" in the coolant outlet hose. Additional flow can be routed to the degas bottle by closing off the flow past the "T" and into the DC/DC converter.

Fig 1: Identifying Motor Electronics Cooling System Components (1 Of 2)

Courtesy of FORD MOTOR CO.

Fig 2: Motor Electronics Cooling System Replacement Components With Torque Specifications (2 Of 2)

Courtesy of FORD MOTOR CO.