Car Parts Discount
Coolant Water Temperature Sender

Aftermarket & OEM Coolant Water Temperature Sender

The effect of a bad coolant temperature sender on your engine.

When you have a fuel ejected engine, several components can affect its performance that we don't realize and one of those is the coolant and water temperature sender. It sends an input to the engine control unit to adjust the ignition timing and the duration of the fuel injector pulse based on the engine operating temperature. There are several indications that identify a defect in this case, and one is that the engine light should illuminate. If the coolant temperature sender is not providing a correct reading, you may smell excess fuel when the motor is started and it may be harder to start than usual. You may also notice black smoke coming from the exhaust pipe because the engine control unit is receiving an inappropriate reading, and doesn't know the current operating temperature. ECU's use the output of this device to adjust the timing and injection to allow optimum performance at varying heat ratios, and if it is not correct the ECU cannot function accordingly. The coolant and water sender in an important safety device, and replacement if faulty must be on the top of the priority list to insure the safety of yourself and your passengers.

What the coolant temperature sender does.

New Coolant Temperature SenderThe water temperature sensor is normally located on the thermostat housing to properly monitor the engine's coolant temperature and react based on it. It is a thermistor that is actually a resistor that functions according to temperatures that are present. It controls the voltage output based on the temperature, and as the heat increases the resistance decreases and in turn increases the voltage output. When the heat decreases, the resistance increases lowering output voltage sent to the engine control unit. This is how the engine control unit adjusts timing and injection, and the coolant temperature sender plays a key role in this process.

Not difficult at all.

Replacement procedures for a coolant temperature sensor are relatively simple on most cars, trucks, and SUV's. They are normally positioned on the water outlet housing and some vehicles may have a separate sending unit for the temperature gauge. In this case the easiest way to tell the difference is by their electrical connections. The gauge sending unit will have a single wire connection and the water temperature sensor will have a two wire connection. After making clear access to the device by removing any obstructions and insuring the engine has cooled and coolant system pressure is no longer present, you can begin. In most circumstances they can be removed using a deep well socket after the electrical connector is removed. On some automobiles they are secured using retaining clips that must be removed. After replacing the coolant water sensor, you should service the antifreeze to the proper cold level prior to starting the engine.


All the parts you will ever need.

Electrical coolant system parts like coolant water temperature senders need to meet precise specifications to function properly. Sensors and senders are safety devices that are depended on to give us a visual representation of the operating temperature and protect the motor. Car Parts Discount has the best OEM parts available and provides excellent support and service to assist you with your purchase. CPD also has the best prices on water temperature sensors and all other parts for your car, truck, or SUV.

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