The most common reason for a coolant temperature gauge not working is a problem with the coolant temperature sensor. Signs of a bad sensor include black smoke in the exhaust, a car using more gas than usual or a car overheating frequently. The check engine light also comes on when there is a problem with the coolant temperature sensor.
The location of the coolant temperature sensor depends on the make and model of the car. However, most sensors are located in or near the thermostat of the cooling system, so it's wise to check the manual of the car to see if there are one or two sensors.
The coolant temperature sensor measures the resistance to the coolant and sends this information to the engine's control unit. The measurements are then relayed to the coolant temperature gauge. It is normal for a gauge to show a very low temperature when a car is first started, but after approximately 20 minutes, the needle of the gauge should rest at the midpoint.
Before replacing the coolant temperature sensor, check to make sure that none of the wires leading to and from the sensor are frayed or cut. Also, look behind the gauge to make sure it is properly wired.Learn More
Heat that is coming from inside the car as well as outside of the car can cause the temperature gauge of the car to increase. When temperatures are extremely high within the inside of the car, the temperature gauge will greatly increase and the car could suffer from many different problems.Full Answer >
There are two main parts to a fuel gauge: the sender and the gauge. The sender is a float that is in the car's gas tank. The sender tells the gauge how much fuel is left in the tank, and this information is displayed on the dash of the car.Full Answer >
If a car will not turn over but the lights and radio still work, the problem is either a bad starter motor or a faulty ignition switch. A clicking noise when turning the key usually indicates a problem with the starter motor. No clicking sound and no sound from the engine can indicate a bad ignition switch. In both cases, the solution is to replace the faulty items.Full Answer >
A temperature sensor measures the hotness or coolness of an object. The sensor’s working base is the voltage that’s read across the diode. The temperature rises whenever the voltage increases. The sensor records any voltage drop between the transistor base and emitter. When the difference in voltage is amplified, the device generates an analogue signal that’s proportional to the temperature.Full Answer >