As the control system receives the temperature from the CTS, it may trigger the cooling fan to either shut off or turn on. Additionally, it may signal the need for a richer fuel mixture or open the exhaust gas recirculation.
What tells the cooling fan to come on?
The engine temperature should trigger the fan to turn on. It will also turn the fan off once the engine has cooled to under 200 degrees. You may have heard of a part called the radiator fan switch or temperature fan switch. This is linked to a thermostat and works much like your home’s HVAC system.
Where is the cooling fan sensor located?
It is most often located close to the thermostat of the cooling system or inside of it. The cooling system is located beneath the air intake pipe and behind the right cylinder.
What controls the electric radiator fan?
The PCM controls fan operation; it uses the signal from the ECT or engine coolant temperature sensor. This sensor senses the temperature of the engine’s coolant and sends a variable voltage signal to the PCM. The PCM operates the fan motor through the engine’s cooling fan relay.
Can a bad thermostat cause radiator fan not to work?
Thermostat issues
Solution: While the thermostat is not strictly a part of the radiator fan system, a bad one can definitely cause problems for your cooling system. Depending on the symptoms your car is displaying, your mechanic may want to check the thermostat and rule it in or out as a cause.
Why does my radiator fan come on when I start my car?
Typically, a radiator fan’s start-up time is determined by the temperature. When the fan is off or on during a maintenance interval, a temperature sensitive switch controls the fan. When the cooling temperature in the engine coolant reached 200 degrees Fahrenheit, an oil fan began circulating.
Why does my radiator fan not turn on?
The most common reasons a radiator fan is not working are luckily due to a blown fuse, bad relay, or a broken wire. It can also be caused by a faulty coolant temp sensor, low coolant level or the fan itself can be damaged.
Why does my engine cooling fan keep running?
The situation when the car radiator cooling fan keeps running constantly can be caused mostly by a failing coolant temperature sensor or its wiring, broken fan start relay, damage to the electrical wires, electronic engine control unit (ECU) problems.
Where does the electric radiator fan sensor go?
The temperature probe should be plugged into the system where the coolant is hottest—generally, the thermostat housing, in the coolant passages adjacent to it, or in the water jacket of the cylinder heads.
How do I know if my coolant temp sensor is bad?
What Signs May Signal Your Coolant Temperature Sensor May Be Failing?
Poor Fuel Economy. Irregular Temperature Readings. Black Smoke from Your Exhaust. Your Engine is Overheating. Your Check Engine Light is On.
What are the symptoms of a faulty cooling fan switch?
Common signs include engine overheating, the Check Engine Light coming on, and a broken or shorter signal wire.
How are electric fans controlled?
The fans are controlled either with a thermostatic switch or by the engine computer, and they turn on when the temperature of the coolant goes above a set point. They turn back off when the temperature drops below that point.
What is fan control module?
An A/C fan control module helps to control the blower that supplies air to the cabin of a vehicle, as well as the cooling fans. The module helps to make sure that the cool air that is produced within the A/C system of a car is blown into the cabin.
What sensor controls the temperature gauge?
To troubleshoot your car’s temperature gauge, you need to know how it works. The temperature gauge reading starts out as a reference voltage that is sent to the coolant temperature sensor. This sensor is nothing more than a thermistor — a variable resistor that changes resistance with temperature changes.
Why does my coolant temperature sensor keep going out?
One of the common problems is; when the sensor has a, poor connection inside or in the connector. This causes interruptions in the signal to the (PCM) and the (PCM) sets the fault. In some vehicles, symptoms of this problem show up as, erratic readings of the temperature gauge.
Can coolant temperature sensor cause overheating?
Engine Overheating
If the coolant temperature sensor malfunctions, it could cause your car engine to get overheated. While sometimes a faulty sensor sends a permanent cold signal to the engine, it can also send a permanent hot signal.
