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What Will Cause the Temperature Gauge to Go Down While You Drive & the Heat Not to Work?

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The cooling system isn’t the most complicated system on your vehicle’s engine, but it can still malfunction over time. The water pump and thermostat are the two most complex parts of the cooling system, which means that a failure will typically occur in one or the other. Consistently low coolant temperatures could only mean one thing; fortunately, the required parts are fairly cheap and easy to install.

Cooling System Basics

An engine’s cooling system starts in its water jacket, which consists of a system of empty chambers placed around the cylinders and in the cylinder heads. The water pump pulls water out of the water jacket and pushes it through the radiator tubes, and thus into the radiator. A thermostat valve closes off the upper radiator hose when the engine’s cold, forcing coolant to recirculate through the block until it warms up.