Initially implemented on GM’s turbo-charged 2.7L L3B and 2.0L LSY four-cylinder gasoline engines, Active Thermal Management uses a rotary valve system to distribute coolant through the ...

After years of working on 6.2L and 6.5L GM diesel engines ... recommended the first thing we do was address the engine's cooling system for improved reliability. In future installments, we ...

Normal systems can't direct coolant to specific parts of the engine—it just runs in a loop. The 2.7L is GM's first engine to use Active Thermal Management, in which the on-board computer can ...