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6 Signs of a Broken Car Temperature Switch and How to Overcome It

09 April 2025
6 Ciri-Ciri Switch Temperatur Mobil Rusak dan Cara Mengatasinya

Basically, every car is equipped with a temperature switch by car manufacturers. This component functions to check whether the car engine is cold or hot. In addition, the temperature switch can also prevent the car from overheating by stopping the coolant from flowing to the radiator. Given its crucial function, you need to always check this component. Therefore, knowing the signs of a faulty car temperature switch and how to address it is necessary. Below, the signs and solutions for a faulty temperature switch will be explained in detail.

Signs of a Faulty Car Temperature Switch

Here are some signs you need to know if the car temperature switch is damaged.

1. Open Temperature Switch

The first sign of a faulty car temperature switch is indicated by the switch opening at a temperature of 30 degrees Celsius. As is known, a normal temperature switch is always in a closed condition and only opens when the temperature is in the range of 90 to 104 degrees Celsius.

If it is already open at a temperature of 30 degrees Celsius, it means the car temperature switch is damaged and needs to be replaced.

2. Closed Temperature Switch

The second sign is the opposite of the first sign. Normally, the temperature switch will open at 90 degrees Celsius. However, when damaged, the temperature switch cannot open. This condition can trigger overheating and cause the engine to fail.

3. Engine Heats Up Quickly or Overheats

The third sign is that the engine heats up quickly or overheats. This condition occurs because a damaged temperature switch will not open even when the temperature reaches 90 degrees Celsius.

This can cause the engine temperature to rise quickly, significantly increasing the potential for overheating. If left unchecked, the car will also experience engine failure.

4. Stuck Thermostat

Signs of a faulty car temperature switch can be marked by a stuck thermostat. Essentially, the thermostat or temperature switch functions as a temperature regulator for the engine. If the temperature has reached 90 degrees Celsius, but the component cannot function properly, it is certain that the thermostat is stuck.

5. Slow Engine Performance and Damage to Other Engine Components

The fifth sign is that the engine performance will usually become slower and less powerful. This condition occurs due to excessive heat, which can damage other car components. This includes damaging the car's electrical system components and the cooling system.

6. Increased Fuel Consumption

The sixth sign is that your car's fuel consumption becomes more wasteful. This condition occurs because a damaged temperature switch affects the engine's combustion process.

Read Also: Know the Causes of Your Car's Temperature Rise!

How to Fix a Faulty Temperature Switch

Here are some steps you can follow when fixing a faulty car temperature switch.

1. Locate the Temperature Switch in the Car

The first step is to find out where the temperature switch is located. Each car type has a different position for the temperature switch. To find out, you can search for information online or check the warranty book and car manual from the dealer.

2. Remove the Temperature Switch

The second step is to remove the temperature switch using a size 17 wrench. 

3. Clean the Temperature Switch if Dirty

If your car's temperature switch is dirty, you should clean it immediately. Use fine sandpaper to facilitate the cleaning process. 

4. Replace the Temperature Switch with a New One

After cleaning, check if the temperature switch functions normally. If not, replace it with a high-quality new component.

5. Recheck if the Car Temperature Switch Functions

Next, fill your car's radiator with water until full. Then start your car's engine so you can check if the temperature switch is functioning properly. 

That’s the information regarding the signs of a faulty car temperature switch and how to address it. How about that, it's quite easy, right? If you have difficulty handling a faulty temperature switch, you can trust it to the nearest Daihatsu authorized workshop. I hope this is helpful!

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