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A pressure cap is used to determine the pressure in your radiator. It raises the boiling point of the coolant. If the coolant boiled, it would cause gas bubbles to form and cause hot spots in the engine cooling chambers. The pressure valve has a spring set on a certain PSI (dependent upon the vehicle, I suppose) so that when/if the pressure in the radiator gets too high, the pressure is enough to force the valve temporarily out of the way, relieving the excess.
Most modern cars have an expansion tank at the top of the system. The coolant, bypassed by the pressure cap, ends up temporarily in the plastic bottle and is then drawn back into the system as the engine cools.
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∙ 12y ago
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What does a pressure cap do?
The purpose of a pressure cap is to close an opening that will be pressurised. Many of them have the extra function of venting if the pressure exceeds a certain value.
Who invented the radiator pressure cap?
the radiator pressure cap was invented by Albert Einstein
Should the power steering box have pressure at the cap?
The power steering box should not have pressure at the cap.
What happens if the pressure cap on the surge tank is left loose defective or will not hold pressure?
If the pressure cap on the surge tank is left loose, defective or will not hold pressure.
Why does coolant leak from pressure cap in daewoo matiz?
Defective cap? Bad thermostat building excessive pressure
How do you pressure test radiator cap?
With a radiator cap pressure tester. The tool usually comes along with a cooling system pressure test kit.
Does the 2001ford Taurus have a radiator cap?
The thread on cap on the engine coolant reservoir is the pressure cap / radiator cap
Where is the radiator cap on 2000 f150?
The thread on cap on your engine coolant reservoir is your pressure cap / radiator cap
Where is the radiator cap on 2001 f150?
The thread on cap on your engine coolant reservoir is your pressure cap / radiator cap
Is the radiator cap and overflow bottle cap the same thing?
If the engine coolant reservoir has a thread on cap , that is your pressure cap / " radiator cap "
Does a 2001 mercury cougar have a cap on the radiator?
No , the thread on cap on the engine coolant reservoir is the pressure cap / radiator cap
Where is the radiator cap for a 2001 Ford Focus?
The thread on cap on your engine coolant reservoir is the pressure cap / radiator cap
