How does the temperature sensor work on a radiator fan?

I would do some testing though just to be sure. It is a simple system as cooling fans go. The ECT sensor tell the PCM the temperature, at 209 degrees the PCM sends a pulsed power signal to the fan control module. That signal keeps getting faster as the temperature rises.

Where is the coolant temperature sensor located on an engine?

The readings produced from the coolant temperature sensor are transmitted to the engine control unit, where they are utilized as data for regulating and maintaining the proper ignition time and the optimal fuel injection through the computerized approach. The engine coolant temperature sensor is usually located on the engine block or cylinder head.

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.

How does the ECT sensor work on a fan?

It is a simple system as cooling fans go. The ECT sensor tell the PCM the temperature, at 209 degrees the PCM sends a pulsed power signal to the fan control module. That signal keeps getting faster as the temperature rises. The control module gets that signal and uses larger power transistors to pass the pulsed signal to the fan.

Where is the coolant temperature sensor located in the engine?

Typically, the coolant temperature sensor is mounted in the engine block or cylinder head, near the thermostat or where the coolant flow is hottest. More than one coolant temperature sensor may be used on some systems to determine the temperature in different locations.

What does the fan sensor on a Cadillac do?

The fan sensor, or cooling fan control switch by its more popular name, controls the operation of your Cadillac’s radiator fan. When the coolant within the radiator reaches a specified temperature, the sensor activates the fan.

Why does my radiator fan only work when the a / C is on?

I was told that it was a faulty temperature sensor which I replaced. The fan still inst working, however if I unplug the temperature sensor the fan works from start up. The fan also works when the A/C is on. What could be the problem? have the same problem?

How do you turn on a radiator fan?

Unplug the sensor wiring and plug in the old sensor. Now just turn on the key and use a small torch or even a candle to heat the old sensor on the area that was inside the engine. What does the fan do?

Where is the relay on a radiator fan?

The fan relay is often located in the engine bay’s fuse box, but the best way is to check your repair manual to find where it is located. Testing a 4 pin relay is often very straightforward. Remove the relay and give 12 volts to pin 30 and 85. Ground pin 86 and check if there is voltage coming out from pin 87.

What does it mean when your radiator fan is not working?

This is what we call a blown fuse. A blown fuse is no big deal, and changing one does not cost a lot of money. If your car’s radiator fan is non-functional, check your car’s user manual and locate the fuse for the radiator fan controller or the fan.

What causes a cooling fan relay to stop working?

Cooling fan relays can stop working for any number of reasons. Common causes for relays going bad include: There are several ways to tell if a bad cooling fan relay is to blame for an overheated engine. The easiest method is to start the engine and then turn on the air conditioning.

Where does the wire from a cooling fan go?

The red wire from our relay connects directly to the cooling fan, and the black wire from the cooling fan connects to ground, both wires will utilize our supplied fan harness.

What should coolant temp be to turn on electric fan?

If your ideal operating temperature is 176-180 I’d agree with setting your fan to turn on at 185, that way it kicks on whenever your coolant temperature starts to climb above that temp your fan can keep things in check.

What happens when I unplug the temperature sensor?

The fan still inst working, however if I unplug the temperature sensor the fan works from start up. The fan also works when the A/C is on. What could be the problem? have the same problem? Fan will default to on with no signal from the sensor, the only other item would be the fan control module.

How can I tell if my coolant temperature sensor is bad?

To diagnose the coolant temperature sensor, you need a repair manual for your car model to find what measurement values you should expect from the coolant temperature sensor. Connect an OBD2 Scanner and look for related trouble codes. Check the live data to see the temperature from the sensor.

What should temp be when cooling fan does not come on?

NOTE: if the cooling fan doesn’t come on when the engine has been operating for 20 minutes or more, make sure that coolant is reaching operating temperature, around 220°F (104°C). You may be dealing with a stuck-open thermostat.

When does a computer turn on a cooling fan?

When the temperature exceeds a specific value — usually 215 degrees Fahrenheit — the computer will turn the fan on. The operating components in the cooling fan circuit include the cooling fan fuse, relay, coolant temperature sensor and the computer.

What to do if your cooling fan won’t turn on?

Pull the cooling fan relay out of the box. Replace the cooling fan relay with a new one. A stuck closed relay is the only thing that can operate the cooling fan continuously with the key off. The computer looses power with the key off and the same applies to the coolant temperature sensor.

What are the symptoms of a bad cooling fan relay?

1. Engine running hot One of the first symptoms commonly associated with a bad or failing cooling fan relay is an engine that runs hot or overheats. If you notice that your engine is running at higher temperatures than normal, that may be a sign that the relay is not functioning properly.

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