Скачать или смотреть HOW THE THERMOSTAT FUNCTION IN THE CAR ENGINE TO KEEP IT STABLE.

THE ENGINE COOLING SYSTEM AND THE THERMOSTAT.

The thermostat is a critical component that plays a huge role in engine efficiency, performance, and longevity.

There are two parts: first, how the engine cooling system works, and 2. the thermostat's specific role within it.

Part 1: How the Engine Cooling System Works

Our fuel combustion engines convert fuel into motion, while doing that, it also generates a tremendous amount of waste heat. Without cooling, the metal parts would melt, seize, and destroy themselves in minutes.

The system is a sealed, pressurized loop filled with coolant (a mix of water and antifreeze). Here’s the cycle:

1. Coolant Absorbs Heat: Coolant circulates through passages (water jackets) in the engine block and cylinder head, absorbing heat from the burning fuel.
2. Hot Coolant Travels: The heated coolant is pumped (by the water pump) toward the front of the car.
3. Heat Release (Radiator): The hot coolant flows into the radiator. As air passes through the radiator fins from the car's motion or a fan the heat is transferred from the coolant to the outside air.
4. Coolant Returns: The now-cooled coolant cycles back to the engine to absorb more heat.

But there's a problem: What if the engine is too cold?

In Part 2: The Thermostat – The Brain of the Cooling System

The thermostat's job is to keep the engine at its optimal operating temperature (usually between 195°F and 220°F / 70°C and 105°C).

How does it work?
It's a simple, brilliant device, typically located where the coolant hose exits the engine. Inside its housing is a wax-filled cylinder with a piston and a spring.

When the Engine is COLD: The wax is solid, and the spring holds the valve CLOSED. This blocks coolant from flowing to the radiator. The coolant is forced to circulate only within the engine block. This allows the engine to warm up quickly, reducing wear, improving fuel efficiency, and reducing emissions.

As the Engine WARMS UP: The coolant heats the wax pellet. The wax expands as it melts, pushing the piston against the spring and forcing the valve OPEN.
At Operating Temperature: The valve is fully open, allowing the full flow of coolant to the radiator to dump the excess heat.
It's Constantly Adjusting: The thermostat doesn't just snap open and shut. It modulates opening just enough to maintain the perfect temperature. If you're idling on a hot day, it might be nearly fully open. On a cold highway drive, it might be partly closed.

Why is This So Important?

1. Efficiency & Emissions: A cold engine runs "rich" (more fuel), is inefficient, and creates more pollution. The thermostat gets it to the efficient temperature fast.
2. Engine Longevity: Metal expands at different rates. Running at a stable, designed temperature minimizes wear on pistons, rings, and bearings.
3. Passenger Comfort: The hot coolant is also what provides heat to your cabin via the heater core. No hot coolant = no heater.

What Happens When a Thermostat Fails?

Fails STUCK OPEN: Engine runs too cold, especially noticeable on the highway. You'll get poor fuel economy, sluggish performance, and often insufficient cabin heat.
Fails STUCK CLOSED: This is the dangerous one. The coolant cannot get to the radiator, so the engine overheats rapidly, which can lead to catastrophic damage like a warped cylinder head or a blown head gasket.
Fails Partially Open: Engine may never reach full operating temperature, reducing efficiency and potentially causing sludge buildup in the oil.

In Summary, The Engine is a heat generator that must be kept within a specific temperature window to operate safely and efficiently.
The Thermostat is the intelligent gatekeeper that manages that temperature by controlling the flow of coolant based on need, ensuring the engine warms up quickly and stays consistently hot without overheating.

Think of it like the AC system in your house: the engine is the house, the radiator is the outside world, and the thermostat is the smart control that opens and closes vents to maintain your perfect set temperature inside the house.
Your opinions, to agree or disagree is welcome in the comment section.

‪@G7AutomobileServiceCompany‬
By Maurice since 2014
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