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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 258 (Hybrid Engine Cooling System) >> Diagnostic Information and Procedures >> Hybrid Cooling System Overheating (Electrical) >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.

The APM and PIM are fastened together and are referred to as the drive motor/generator control module assembly. The drive motor/generator control module assembly is cooled with pre-mixed DEX-COOL® circulating through a cooling system that is separate from the engine cooling system. The power electronics cooling system utilizes a heat exchanger at the front of the vehicle and two electric pumps to circulate the coolant. The engine control module (ECM) monitors a temperature sensor in the power electronics cooling system and operates the radiator fan and the power electronics coolant pump in response to power electronics cooling system temperature.

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