What Is A Thermostat, How Does It Work, And How Do You Fix It?

Thermostat Repair

One of the most important parts of the cooling system is the thermostat. If it breaks, there will be no way to keep the engine cool. What is its purpose, and what will happen if it refuses to follow orders?

How Does The Thermostat Appear? 

It’s a relatively basic gadget that can be found in a variety of household equipment, such as a washing machine or an iron. A simple bellow made of the thin brass sheet with a mushroom valve serves as the thermostat. Many automobiles include thermostats that include wax, copper, graphite, and aluminum.

The thermostat remains closed when the liquid in the refrigeration system is cold, and it circulates the engine block and head to reach the thermostat. It is then returned; in this case, we are dealing with a “short circuit.”


The bellows will open the valve under the influence of heat when the temperature is around 95 degrees Celsius, and the water will enter the radiator. The thermostat is closed again after the liquid cools down to around 20 degrees Celsius while running through the heat sink.

The little vent on a properly operating thermostat must be kept clean and fully open at all times. Air bubbles will form inside the thermostat if it becomes blocked, which may prevent it from working correctly.

Thermostat Failure Can Be Divided Into Two Categories

There is damage in both the open and closed positions. The first form of defect, as you might expect, is that cooling operates continually on the entire circuit, all of them while using the cooler. The engine cannot reach operating temperature because the coolant temperature is too low. Cabin heating frequently fails or performs badly, resulting in large increases in fuel use.

The permanent shutdown of a thermostat is the second sort of problem. This is a far more hazardous kind of failure. 

What Is The Reason For This? 

When the thermostat is closed, the coolant can’t flow through the radiator and cool down, so it starts to heat up quickly, unable to remove heat from the engine. Even if only for a short distance, driving with this type of damage can cause the drive unit to overheat.

What Are The Signs And Symptoms Of This Kind Of Thermostat Failure?

The excessive engine temperature, first and foremost. Please be aware! An improperly tensioned V-belt driving the water pump, or an overheating radiator can also produce this condition.

If all of these components are functioning properly, we can be certain that the thermostat is to fault for the high engine temperature.

How Can You Still Diagnose A Problem Like This?

First and foremost, keep an eye on the engine temperature gauge. If the minimum temperature is displayed while driving, we can nearly be certain that the thermostat is not functioning properly.

You can also check the temperature of the radiator’s two thickest hoses on both sides. If we detect a comparable temperature by touching them, it is also a clue that something is amiss with the cooling system, with the thermostat being the most likely culprit.

How Can You Get Rid Of A Flaw Like This?

You can disassemble the thermostat and verify if it opens in hot water if you have the time and desire to do so. To get rid of it, you must first locate it. It’s normally near the water pump in most cars, at the upper section of the head.

To avoid being scalded by the hot coolant, it is vital to wait for the engine to cool down before removing it. Once you’re sure the engine is cold, remove around a liter of coolant into a clean container ahead of time to avoid leaks.

You should purchase a new gasket for the thermostat’s housing before removing it; the old one is typically not acceptable for reuse.


After disconnecting the thermostat, we should check to see if any contaminants are interfering with its correct performance. If the thermostat does not operate after being immersed in hot water and is not unclean, it should be replaced.

We must carefully clean the area where the new thermostat will be located before installing it (repairing the old one is not cost-effective). This is necessary to prevent dirt from entering the cooling system. Attach the thermostat, pour coolant, and check its tightness after carefully preparing the socket.

Customer service is made simple and quick for customers. For additional information, please contact us!

Leave a Reply

Your email address will not be published. Required fields are marked *