Transmission Cooler: Description and Operation

Transaxle Cooling

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 DC/DC converter to the MECS pump through the eCVT, then through the MECS cooler from the LH to RH side of the vehicle back to the DC/DC converter.

The MECS cooling pump will make an audible noise if it is running and a slight vibration may be felt by touch.

The MECS cooling system has a coolant expansion tank mounted on top of the transaxle.