1. A system for detecting a reduction in engine coolant flow rate, comprising: a device configured to monitor at least one parameter associated with an engine, wherein the at least one parameter includes at least one of engine speed, turbo boost pressure, intake air mass flow in an engine air intake system, and a temperature of an engine coolant adjacent a coolant system inlet of a charge air cooler through which the engine coolant flows; a device configured to measure actual engine air intake manifold temperature; and a controller configured to: determine a theoretical engine air intake manifold temperature based on the at least one monitored parameter; and generate a signal indicative of a reduction in engine coolant flow rate based on a comparison of the theoretical engine air intake manifold temperature with the actual measured engine air intake manifold temperature.