# Can I bypass a thermistor?

## Can I bypass a thermistor?

Generally speaking, a thermister is a resistor that is sensitive to/affected by ambient heat. When the ambient heat changes, it’s value will change. You can bypass it with a regular resistor, but you have to know the value associated with the thermister.

Should a thermistor have continuity?

The thermistor that you are asking about is a negative temperature coefficient sensor. It should always measure continuity. The resistance of this sensor is used by the control board to determine temperature.

### What happens if thermistor is bad?

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.

Should thermistor have continuity?

## How do you find the resistance of a thermistor?

The actual resistance values of a particular NTC thermistor are obtained by multiplying the ratio RT/R25 (tabulated value) by the resistance value at 25 °C (specified in the data sheets).

Can you bypass thermistor?

### How to test a PTC thermistor?

Testing a PTC thermistor follows all the same steps as a NTC thermistor. First check, with an ohmmeter, the thermistor without any heat applied. With a PTC thermistor at room temperature or below, the thermistor should measure a very low resistance. Now apply heat, just like before, to the thermistor’s body.

What is a thermistor and how does it work?

A thermistor is a resistor whose resistance changes according to the temperature it is exposed to. There are 2 main types of thermistors: negative temperature coefficient (NTC) thermistors and positive temperature coefficient (PTC) thermistors.

## What should the resistance value of a thermistor be?

Before any heat is applied to the thermistor, its resistance value should be very closely near its rated resistance value. So, for example, if we are testing a 10KΩ thermistor, before we apply any heat, its resistance value should be very close to 10KΩ. If you’re in a relatively warm room, it may be about 9.3KΩ.

How do you test a thermistor with an ohmmeter?

First check, with an ohmmeter, the thermistor without any heat applied. With a PTC thermistor at room temperature or below, the thermistor should measure a very low resistance. Now apply heat, just like before, to the thermistor’s body.