Most popular

What do thermostats use to open the valve to allow coolant flow?

What do thermostats use to open the valve to allow coolant flow?

Most thermostats are the “pellet” type; the name comes from the wax pellet that expands as the engine coolant warms. The pellet’s expansion forces the valve open. Thermostats occasionally get “stuck shut” which cuts off the cooling capacity of the radiator, at least partially.

What opens and closes to allow coolant into your engine?

The thermostat is like a valve that opens and closes as a function of its temperature. The thermostat isolates the engine from the radiator until it has reached a certain minimum temperature. Without a thermostat, the engine would always lose heat to the radiator and take longer to warm up.

Where does the coolant go in an engine?

The primary valve operates exactly the same as the non-bypass thermostat and opens allowing coolant to flow to the radiator when the engine is at normal operating temperature. The secondary valve allows coolant to be circulated back through the engine during its warmup stage.

Why does the secondary valve close when the engine is warm?

The secondary valve is open and directs the flow of coolant back through the engine allowing it to warm up faster. As the engine warms up the primary valve begins to open and the secondary valve begins to close. Figure (2) shows the secondary valve completely closed when the engine is up to proper operating temperature.

What’s the temperature of the coolant flow radiator?

The 180 Degrees F thermostat begins to open at (you guessed it!) 180 Degrees F and is fully opened at 200 degrees F. Different engines use different temperature thermostats. Some high range thermostats maintain engine operating temperatures above 200 degrees F. This causes the engine to burn up more pollutants and aids in emissions control.

How does a vacuum valve work in an engine?

As temperatures drop and the coolant contracts, a vacuum is created in the engine’s cooling system. The vacuum valve opens and allows coolant to flow from the overflow tank back into the radiator. This valve allows for contraction as the fluid cools.

Where does the coolant go when the expansion valve is stuck?

If the expansion valve becomes stuck open, it allows a constant flow of pressurized coolant to enter the reservoir, where it turns to steam. The steam, which has coolant in it, is forced out of the the reservoir cap vent hole or loosens the cap. Steam and coolant are released into the engine compartment.

What are the functions of coolant switching valves?

The key functional feature of coolant switching valves within thermal management modules is the ability to either allow or block flow, or to mix/divert the flow to a specific proportion. The valves come in a variety of different designs, such as:

What causes coolant to enter the overflow reservoir?

Overflow Reservoir. When a vehicle overheats, or after the engine has been turned off after a long ride, an expansion valve opens inside the radiator cap to allow pressurized coolant to enter the overflow reservoir. If the expansion valve becomes stuck open, it allows a constant flow of pressurized coolant to enter the reservoir,…

Where is the coolant flow radiator located on a car?

The Heater Core The heater core is a smaller version of the radiator that is used to keep your toes warm when it’s cold outside. The heater core is mounted under the dash board. Some of the hot coolant is routed through this little radiator, by more hoses.

Author Image
Ruth Doyle