The sensor works by measuring the temperature that’s being given off by the thermostat and/or the coolant itself. The temperature is then sent to the on-board control system.
What happens when a coolant temp sensor fails?
If the coolant temperature sensor malfunctions, it can transmit a false signal to the computer. And the response of the computer may unbalance the timing and fuel calculations. It is also common for a coolant temperature sensor to fail without warning and send permanently cold signals to the computer.
What are the symptoms of a faulty temperature sensor?
- Poor Fuel Economy.
- Irregular Temperature Readings.
- Black Smoke from Your Exhaust.
- Your Engine is Overheating.
- Your Check Engine Light is On.
Where is the radiator temperature sensor located?
The coolant temperature sensor will be located directly behind the coolant pipe. In most modern cars and vehicles, this is present behind the right cylinder head that is located right underneath the air intake pipe.
Can I drive without coolant temperature sensor?
It is possible to drive a vehicle with a faulty coolant temperature sensor as the management system defaults to a static reading. A vehicle’s coolant sensor is a critical component used by the engine management system. It directly affects, cooling and fueling of the engine and therefore affects how the engine performs.
What sensor turns on the radiator fan?
On most modern cars, the cooling fan is controlled by the Engine Control Unit (ECU) which gets a signal from the coolant temperature sensor.
How do you test a coolant sensor?
Gently lower the end of the sensor into the water until the entire device is fully submerged. Wait a minute or so for the screen to give you a reading of the cold water. Once you have a reading, write down the measurement for reference. A common reading for a temperature sensor in cold water is around 5 volts.
Does coolant temp sensor affect transmission?
Yes, a failing coolant temp sensor can illuminate the MIL and cause the engine to run rich or lean. The transmission may shift incorrectly or not lock-up the torque converter.
How much does it cost to replace a coolant temperature sensor?
On average, the cost of a coolant temperature sensor ranges from $20-$80, while the cost of labor ranges from $50-$250. In total, one could expect to pay $70-$330 to have their engine coolant temperature sensor replaced.
Does coolant temp sensor affect idle?
Can a bad coolant temp sensor cause rough idle? Yes, due to the false signal sent to the car computer, it will adjust the air-fuel mixture. The supplied mixture will not be enough and result in vibrations and shaking at idle or low-speed maneuvers and lead to other strange behavior and loss of engine power.
Does coolant temp sensor affect AC?
Inconsistent cooling If the ambient temperature sensor fails or is sending out an inconsistent signal, then the AC system may have trouble maintaining cool and comfortable cabin temperatures.
Are there 2 coolant temperature sensors?
There are two temperature sensors in some vehicles, one to send information from the engine system to the control unit and another from the control unit to the dashboard.
Can a bad temp sensor cause 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.
Can a temp sensor affect engine starting?
If you have starting problems and the ‘check engine’ light doesn’t come on, you may have a bad engine coolant temperature sensor (ECT). They’re quick and easy to replace.
How long does it take to replace a coolant temperature sensor?
If you are doing it yourself it will take 4 to 5 hours. However if a skilled mechanic is doing it, it will take 2 to 3 hours only. Whether your car was running or not. If the engine of your car is running, then you will have to wait at least 1 hour before you start replacing the bad coolant temp sensor.
Can you run a car without a temperature sensor?
If you unplug the sensor when the engine is cold the engine may run smoothly at first but as the engine warms up the a/f mix will become too rich and the engine will start misfiring and possibly stall.
How long can you run an engine without coolant?
However, if you absolutely must start your car without coolant, it can probably run for about a minute without too much risk of damage. You may be able to get away with as much as 5 minutes of running without coolant, depending on the engine, car model, and how hard you’re asking the engine to work.
What does a P0128 code mean?
Error code P0128 indicates that your engine coolant temperature is below the thermostat regulating temperature. This means that your Engine Control Module (ECM) or Powertrain Control Module (PCM) has recognized that your engine is running cooler than it’s supposed to.
How do I know if my radiator fan relay is bad?
Is there a sensor on the radiator?
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.
How does BMW coolant level sensor work?
The ECT sensor is typically near the thermostat in the cylinder head or thermostat housing. Many vehicles also have a second ECT sensor on a different part of the engine or radiator.
Why does my coolant light keep coming on BMW?
The coolant level sensor works with a float that contains a ring magnet. The ring magnet closes the reed switch inside when there is enough coolant in the radiator. Once the coolant drops to a certain level, the float follows the level, the reed switch is removed from the magnet, and contracts the reed switch open.
Why is my coolant light on when its full?
Reasons Why Your Coolant Might Be Low leak in radiator. leak in radiator hoses. leak in water pump. damaged or broken radiator seal.
Does the coolant temp sensor control the thermostat?
The indicator is telling you that the fluid level is below the sensor, however, once you start driving and the engine heats up, the light should go off. If your coolant light stays on even after driving for a few minutes, then it’s time to check your coolant levels and the coolant sensor.
What does a coolant temperature sensor control?
No, the thermostat works off the heat of the water passing through it. A coolant temperature sensor might control the electric cooling fans though.