Water Temperature Sensor (temp sensor sender,water temp switch)
What they do
The engine coolant temperature (ECT) sensor is a relatively simple sensor that monitors the internal temperature of the engine. Coolant inside the engine block and cylinder head(s) absorbs heat from the cylinders when the engine is running. The coolant sensor detects the change in temperature and signals the Powertrain Control Module (PCM) so it can tell if the engine is cold, warming up, at normal operating temperature or overheating.Failure Symptoms
When bad, can cause a rough idle, misfire, and general porr running of the engine.
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