First, the engine was run with coolant temperature at degrees, then at degrees, where it lost about 18 horsepower and 15 lb-ft of torque at the higher temperature. That might seem like a big loss, but the big-block Chevy was making horsepower and lb-ft so if you do the math, that's about a 2 percent decrease in power and torque. There are a couple ways you could find out if your thermostat is open.
The easiest way is to start the car cold and drive it around, watching the temperature gauge climb until it stops increasing. If the coolant temperature never stops increasing, it's likely your thermostat isn't opening, or you have another problem with your cooling system. If the coolant temperature never increases up to normal operating temperature, it is likely your thermostat is stuck in the open position.
The other way to tell if your thermostat is opening is to remove the radiator cap before starting the car and with the engine cold. Then, start the car and let it warm up to operating temperature. Once it gets up to the thermostat opening temperature—usually between and degrees—you should be able to look into the top of the radiator and see the coolant start to flow.
Previously it was explained that the main function of the thermostat is to keep the engine temperature at the ideal point. How the thermostat works will follow the performance of other engine cooling components. First, the water pump lets water fall to the engine via the water jacket. At this stage the water will flow around the engine to capture the heat in the engine.
Then the water will come out through the hose and then enter the top of the radiator. In this process, the engine temperature will decrease because it is carried away by the cooling water contained in the radiator.
The heat entering the radiator will be released through the radiator grille and then cooled by the fan behind the radiator. The water that has dropped in temperature after going through the radiator grille will come out of the hose located at the bottom of the radiator to be pumped back into the engine and carry out the process of lowering the engine temperature all over again. This process occurs repeatedly when the engine is running, especially when the engine is at maximum temperature.
However, when the engine is cold, this rotating water will be covered by the thermostat so that the water circulation does not run through the radiator and the engine car can reach an optimal temperature.
Some resort to it to fully make sure that it works. Also, this method will allow you to check the performance of a new part, since this will not work in the store.
To do this, you need to heat the water boiling water - above 90 degrees. The part is dipped into a container of boiling water. If after a couple of minutes the valve does not open, then the part is faulty - either something happened to the stem, or to the spring, or maybe something happened to the container in which the wax is located. You don't need to be a leading mechanical expert to test the thermostat on the machine without removing it.
It is enough to understand how the device works. During the first minutes of engine operation, the entire cooling system should not heat up. With this in mind, you need to do the following:. If there are irregularities in the operation of the thermostat, it is best to replace it immediately.
The thermostat is an unpretentious part in a car. Its working resource can be quite large. Nevertheless, in view of various circumstances, it can fail. Here are some reasons for the breakdown:. If the thermostat breaks, it can be either open or closed. In the first case, the motor will warm up for too long antifreeze moves immediately through the radiator and cools. In the second case, the motor will constantly overheat the temperature arrow will jump almost a few minutes later, and subsequently will show a maximum.
In this case, the radiator and the expansion tank will be cold. There is also another sign of a faulty thermostat. For further information about our new range of thermostats, contact us. Previous Next. View Larger Image. Read more: Discover our new thermostats attached to water pumps Types of automotive thermostat There are different types of automotive thermostat that can be found on the market: Conventional thermostats have been further developed.
How to check if a car thermostat is malfunctioning A faulty or blocked thermostat can lead to engine overheating.
Some of the problems and symptoms of a failing car thermostat and the damaged it can cause are: Engine overheating or engine too cold. If the thermostat is not working, the gauge will end up outside the range it should be. Engine temperature changes. Erratic temperature fluctuations can also be an indicator of its malfunction and poor engine performance.
Coolant leaks around the thermostat housing or under the vehicle indicates may also be leaking coolant which can be caused by the thermostat not allowing coolant to flow when it is stuck in the closed position. About the Author: Patricia Gimeno.
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