Escape 4WD L4-2.5L Hybrid (2009)
Water Pump: Description and Operation
Motor Electronics Cooling System (MECS) Pump
The motor electronics cooling system is required to maintain an acceptable temperature for the transaxle and the DC/DC converter. The system
temperature is monitored by the motor electronics coolant temperature (MECT) sensor, which is an input to the PCM. The PCM commands the MECS
pump using the MECS pump relay. The MECS pump is commanded on whenever the traction battery contactors are closed. The coolant in the system
flows in a loop from the MECS pump, to the transaxle, then into the MECS radiator bottom hose port, out of the top hose port of the MECS radiator, into
the DC/DC converter, and back into the MECS pump. The cooling system has a degassing system that is connected in parallel between the MECS
radiator and the MECS pump. The degassing system bleeds air/gases into the degas reservoir.
Motor Electronics Cooling System (MECS) Pump
Motor Electronics Coolant Flow
