A coolant temperature switch operates as a variable resistance thermostat that adjusts its resistance as an engine's coolant temperature begins to change. The coolant temperature device gets monitored by the engine computer to maintain regulation of the different ignition, fuel and emission functions. The coolant temperature device is also responsible for turning the radiator - cooling fan on and off as required.
It is not unusual for an automobile engine to shut down from overheating - especially during the hotter months. This can be an action to protect against engine damage caused by overheating. The coolant temperature device is designed to help prevent this type of situation. Under normal circumstances a car engine needs to run long enough for the coolant temperature to reach 220 degrees Fahrenheit. This will in turn activate the coolant temperature switch. There is usually a warm up period that takes around 15 to 30 minutes. If the engine shuts down, there are a few reasons that might cause this type of occurrence include:
You should always be sure to check the coolant levels in the surge tank. Keep in mind that the tank should always measure one quarter to one half full.
The coolant temperature switch is usually closed. You can test it out with a Volt - OHM Meter to check for continuity. Next, check to make sure the engine runs. If you find that your engine is still running, try checking the surge tank to make sure there is coolant circulation. If no circulation is present, try moving the coolant temperature switch on the control panel. Go slowly from full heat to the cold setting around every 60 seconds. Repeat this for five minutes. This helps expel any air being held inside of the radiator and heater coils. Check the surge tank and ad a 50/50 mix of coolant as directed.
The coolant temperature switch is engineered to carry a high electric current. The switch is what send the message to increase or decrease airflow for temperature control. The coolant temperature switch is connected to an internal control system designed to monitor temperature. The system should have indication, warning and alarm functions. The coolant temperature switch is responsible for cooling hydraulic oil, transmission fluid and brake fluid as well.
A coolant temperature switch for a car engine must be rugged and durable to meet the application requirements. The device must also prove accurate and reliable so that it delivers excellent performance. The device can be mounted in various places including the engine water heater jacket or hydraulic oil tank. The coolant temperature switch can be installed to operate as a single unit or as two or three unit configurations in order to monitor multiple units.
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