Can a bad coolant temperature sensor cause high idle?
A coolant sensor that always reads hot may cause cold driveability problems such as stalling, hesitation and rough idle. This also affects engine performance and fuel economy. If the computerized engine control system is faulty, high idling can be one symptom.
When to replace a coolant temperature sensor on a car?
A corroded coolant temperature sensor will give an incorrect reading. It is, therefore, important to replace the coolant temperature sensor as soon as it shows signs of corrosion. Allow the engine to cool down so that you do not get burned. Place a catch pan under the radiator once you can touch the engine.
What should coolant temp be when engine is hot?
With a good OBD2 code reader, you can also check the live data and the parameters of the CTS sensor. Check that the temperature value of the CTS is around 80-90c when the engine is hot. A lot of engine coolant temperature sensors have two wires and the sensor is controlled by Ohm.
Why does my car coolant sensor keep dropping?
If there is a leak in the engine bay and the oil enters the engine block, the coolant will get contaminated, causing a problem to the ECT sensor. The coolant system of the car does not need constant refilling. However, if the coolant level is dropping frequently, there might be a leak which should be fixed immediately.
What causes coolant to leak from under the motor?
If this occurs, the potential of overheating becomes greater. If your engine is overheating occasionally, the problem may be with the coolant temperature sensor. Coolant is leaking under the motor: it’s also common for the coolant temperature sensor to become loose and cause engine coolant to leak from under the motor.
What should the temp of the coolant sensor be?
Check that the temperature value of the CTS is around 80-90c when the engine is hot. A lot of engine coolant temperature sensors have two wires and the sensor is controlled by Ohm. Get a wiring diagram and find out what ohms you should have at a specific temperature to check the function.
Can a bad coolant sensor cause a car to not start?
Some cars use the engine coolant temperature sensor to control the electric cooling fans. You have two separate temperature sensors for the fans, dashboard gauge, and engine management in most cars. However, if your car has a single sensor, a bad engine coolant temperature sensor may result in your fans won’t start at all.
What to do when your coolant sensor is replaced?
Properly dispose of used coolant. Step 16: Lower vehicle from jack stands. Place the vehicle back level to the ground. Once the coolant temperature sensor has been replaced, you need to start the engine, check for leaks, and refill the radiator fluid in most cases before you test drive the vehicle.
If this occurs, the potential of overheating becomes greater. If your engine is overheating occasionally, the problem may be with the coolant temperature sensor. Coolant is leaking under the motor: it’s also common for the coolant temperature sensor to become loose and cause engine coolant to leak from under the motor.