in cars are often neglected, if not totally forgotten, units. Yet they play an important role in the general performance of cars by restricting water flow until the engine has warmed-up.
Thermostats are heat sensitive valves that open and close. On cars they prevent circulation
of coolant to the radiator until the engine is warm enough. When the thermostat is closed water only flows through the water pump and water jacket to let the engine warm quickly. When the thermostat opens, water can then pass through the radiator for general cooling.
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Having a car that warms quickly is particularly useful in cold weather when you want to use your car heater
as soon as possible
The thermostat is in a small housing positioned where the top radiator hose
connects to the engine.
The best time to check or change a thermostat is when you are servicing your radiator because you need to drain the cooling system
first. Hence, a thermostat change is a good time to flush and clean your cooling system, check all radiator
hoses and the radiator pressure cap. Be sure you have the correct cap on your radiator and it is not rusted.
Thermostats are small, inexpensive items. You can test them by heating in water and checking their operating temperature with a thermometer. However it really is quicker and ultimately more reliable to simply fit a new one,
1. thermostat common problems (replace every 50-60k miles)
switch sensor (which turn your cooling fan on and off)
3. check and see if the cooling fans is running
when the engine get to its operation temperature. (fan motor can be fault)