The radiator cap when bad will allow pressure to go back to the overflow bottle, after that check your thermostat. The coolant system should be pressurized when warm, so much so that the hoses feel hard when squeezed. The radiator cap is made to release the pressure when it becomes too great, if your cap is worn out the pressure will release too early and pressure will blow out to the coolant bottle.
It collects the expanding coolant that is heated by the engine and recycles it back into the coolant system once it loses enough heat. The radiator overflow tank works in conjunction with the radiator cap to protect the engine and prevent coolant loss due to overflow. Source: Quora.com
Water should be fine, but mix it with coolant when you can to prevent rust from developing in the radiator.
Drain coolant from radiator plug located either at bottom or rear of radiator Re-fill slowly to prevent an "airlock"
Slowly to prevent an "air lock" through the top of radiator or through coolant recovery tank
Typically this is caused by either an engine thermostat that is stuck closed or a radiator that is bad and needs re-cored. With the engine running and radiator cap off and engine warmed up to normal operating temperature or above, look in the radiator for coolant movement. If you see it flowing, have the radiator repaired or replaced. It,s important to remove the cap prior to warming it up to prevent injury from hot coolant under pressure.
It has a much lower freezing point than water. if the coolant freezes it expands cauing pressure damage or even leaks. It also contains anti corrosion chemicals to prevent rust inside the engine.
Drain radiator through plug at bottom or rear of radiator Re-fill radiator with a 50/50 mixture of antifreeze and water slowly to prevent an air lock
It acts as a coolant and prevent the car from overheating during summers. Hope this Helps!!
Not necessary to drain all coolant, just enough to be able to remove radiator hose from thermostat housing and prevent much leakage.
Drain radiator RE-fill slowly to prevent and "air lock" Run vehicle to normal operating temperature with heater on Check coolant level
Oil is not a coolant, it is a lubricant, but it keeps the engine lubricated to prevent friction, which reduces heat and makes is run cooler. Water in the radiator, and the radiator fan, is what keeps the engine cool.
Drain about 1 gallon of coolant from radiator Follow upper radiator hose to engine Disconnect housing Note how thermostat is installed Clean both surfaces Replace thermostat and gasket Re-fill coolant slowly to prevent "airlock" Start engine-look for leaks Run engine to normal operating temperature with heater on Check coolant level Drain about 1 gallon of coolant from radiator Follow upper radiator hose to engine Disconnect housing Note how thermostat is installed Clean both surfaces Replace thermostat and gasket Re-fill coolant slowly to prevent "airlock" Start engine-look for leaks Run engine to normal operating temperature with heater on Check coolant level