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GENERAL ENGINE DIAGNOSTICS Section IV Page 20 August 2004 Poor Coolant Circulation Diagnosis Proper engine operation depends on coolant to flow through the engine water jackets and absorb the heat of combustion, and then to transfer it to the outside air by flowing through the radiator. A typical engine (coolant) operating temperature is about 200 F (94 C); some older engines run cooler and some newer engines run hotter. With proper flow, the engine coolant in most vehicles can readily absorb, transfer and release heat. When the flow or volume of coolant is too low, engine temperatures ...