It replaces coolant back into the system by drawing coolant from the reservoir that was pushed out into the reservoir during the heat up process.
Pressure and Vacuum
pressure-relief valve
Check valve
Check valve in radiator cap malfunction, replace radiator cap.
To change coolant on a Toyota Corolla, place a bucket under the radiator. Open the radiator drain valve and remove the radiator cap. When all antifreeze drains out, close the drain valve. Then refill with fresh antifreeze and replace the radiator cap.
The radiator cap controls cooling system pressure.The radiator cap controls cooling system pressure.
Radiator Cap?
no air bleed valve. all you need to do is to remove the radiator cap and let the car idle for a few minutes.
A hot radiator releases excess coolant through the spring-loaded cap in to the reservoir, and when cooled the partial vacuum created by cooled radiator pulls it back in. A reservoir should be only about 1/4 full cold on a system that uses a radiator cap, some cars have a pressurized cap on reservoir and no cap on radiator
Low on coolant, check valve in radiator cap faulty, air pocket,
The purpose of the water shut off valve cap is to protect the valve from dust, debris, and damage. It helps maintain the functionality of the valve by preventing these external elements from entering and potentially causing the valve to malfunction.
To drain the radiator on a 1999 Ford Expedition, place a bucket under the radiator. Unscrew the radiator drain hose or valve on the bottom of the radiator. Remove the radiator cap.