Can you bypass a thermistor?

Asked By: Willard Puga | Last Updated: 2nd January, 2020
Category: home and garden indoor environmental quality
4.2/5 (3,666 Views . 38 Votes)
If the thermistor is bad, can you bypass it by putting the two wires that go to it together (securely) and bypassing it? No, if the thermistor is bad, you can not bypass it. It must be replaced.

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Thereof, can a thermistor go bad?

If it is near its rated resistance value, then so far, it is good. If it is very far or much different than its rated value, then the thermistor is faulty and should be discarded.

Furthermore, what should a thermistor read? A good thermistor should have an ohm reading around 11K Ohms at room temperature. If your ohm reading is far higher or lower than this then you should replace the thermistor.

Furthermore, what happens if a thermistor fails?

When a thermistor is failing, it'll display incorrect temperatures, or you'll see impossible temperature fluctuations. They measure temperatures and send resistance signals to the AC control module, allowing the system to automatically adjust so the cabin remains at the temperature you set.

Does a thermistor have continuity?

Thermistors do not have continuity, they show resistance. You should read around 10k Ohms at room temperature.

39 Related Question Answers Found

What does a thermistor look like?

A thermistor is a resistance thermometer, or a resistor whose resistance is dependent on temperature. The term is a combination of “thermal” and “resistor”. It is made of metallic oxides, pressed into a bead, disk, or cylindrical shape and then encapsulated with an impermeable material such as epoxy or glass.

Does a thermistor have polarity?

A thermistor generally has no polarity, however it may be that there is more inside the sensor than just the thermistor.

Can you drive with a bad coolant sensor?

Anyone with specific knowledge weigh in. Usually the Coolant Temp Sensor is used for the gauge for fuel trims for cold start enrichment, and fan control. Since the Thermostat and water pump are mechanical the engine will still cool. you will be fine driving until the replace the sensor.

Does the coolant temperature sensor control the fan?


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. As the control system receives the temperature from the CTS, it may trigger the cooling fan to either shut off or turn on.

What happens if I unplug coolant temperature sensor?

Plugged in, the sensor is sending a signal for an extremely cold setting, with a very rich mixture as the result. Disconnecting the sensor may be getting you a default setting, and fuel mixture, that is much better for the engine's performance.

Where is the cooling fan sensor?

The cooling fan relay is normally located in either the underhood fuse and relay center or mounted to the electric fan assembly behind the radiator.

Where is the temperature sensor located?

Most of the time it is close to the thermostat of the cooling system, or in some cases even inside of it. Note: Some engines may actually have a pair of sensors—one sending information from the engine to the control unit, the other sending information from the control unit to the dash.

Do you need to drain coolant to change coolant temperature sensor?

Locate and slowly remove the cooling system pressure cap to relieve the system of any residual pressure. You will then need to drain the cooling system because the sensor is submerged in coolant and when it is removed coolant will leak from the coolant port.

How do you change a coolant temperature sensor?


Replacing this sensor is an easy project that can be done in your own garage or on a flat driveway.
  1. Step 1 - Open Car Hood.
  2. Step 2 - Locate Coolant Temperature Sensor.
  3. Step 3 - Remove Lead Wire from Terminal.
  4. Step 4 - Loosen Coolant Sensor.
  5. Step 5 - Remove and Replace.
  6. Step 6 - Torque Sensor in Place.
  7. Step 7 - Reconnect Wire.

What does the thermistor do in a refrigerator?

In refrigerators, the thermistor is a key part of the system that allows the refrigerator to stay within a short range of temperatures and turn on its cooling cycle when the temperature starts to rise.

What does a thermistor do on a combi boiler?

They are used across a variey of industries, but play a vital role in delivering heat and hot water in your modern gas boiler, but what excatly is a thermistor? Thermistor is formed from the words "thermal" and "resistor", and it is an electrical component whose internal resistance changes with temperature variation.

What does a thermistor do in an air conditioner?

Symptoms of a Bad or Failing AC Thermistor. An AC thermistor is a type of temperature sensor that is commonly found on modern AC systems. They detect temperatures and send a resistance signal to the AC control module so that the automatic adjustments can be made to keep the cabin at the correct temperature.

How many ohms should a thermistor read?

For example, if the specified resistance at 25°C for a thermistor with 10% tolerance is 10,000 ohms then the measured resistance at that temperature can range from 9,000 ohms to 11000 ohms. A value that represents the relationship between the resistance and temperature over a specified temperature range.

What does a thermistor do in a washing machine?


They are used in washing machines Because their electrical resistance at various temperatures is known, it's easy for the washing machine to monitor a thermistor and detect when certain temperatures are reached.

Is a thermistor the same as a thermostat?

As nouns the difference between thermostat and thermistor
is that thermostat is thermostat while thermistor is a resistor whose resistance varies rapidly and predictably with temperature and as a result can be used to measure temperature.

What is B value in thermistor?

Another important characteristic of a thermistor is its “Bvalue. The B value is a material constant which is determined by the ceramic material from which it is made. it describes the gradient of the resistive (R/T) curve over a particular temperature range between two temperature points.