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A radiator cap should never be opened when the engine is warm or especially hot!
The specific steps for your vehicle type may then instruct you to start the car with the cap off and run the engine while filling, but never open the radiator when hot.
Reason: the cooling system builds up pressure as the engine warms, and removing the cap while pressurized will create a dangerous geyser of coolant.
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∙ 15y ago
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Should the car be cold or Hot to Check antifreeze?
cold. If you open the radiator when the car is hot, it can spray all over the place.
Why is antifreeze required to be added to an engines coolant?
Antifreeze helps the engine run cooler in the hot months and prevents the coolant from freezing in cold weather.
Do you put antifreeze directly into the radiator of a 2005 impala?
Yes. First top up the radiator then fill the overflow reservoir to the "HOT" mark if the engine is hot or the "COLD" mark if the engine is cold. Be CAREFUL when you remove the radiator cap on a hot engine. The coolant is under pressure.....
Truck engine temp goes from hot to cold?
it should start at cold
Where does the antifreeze go in a 94 Acura Legend?
In the overflow tank as well as the radiator. You should not do this while the engine is HOT!
Would lack of coolant or antifreeze make a car rumble?
It could if you are running it in very cold or very hot weather. In the winter, the engine has to warm the fluids and since the fluids are cold and thick, it takes more engine force to move them. In the summer, they are too thin so the engine isn't fighting the viscosity of the fluids. It's always best to make sure antifreeze/coolant is full. Always check them when the engine is hot. NEVER check Radiator HOT!
What is the antifreeze level for Malibu 2001?
this should be marked on side of overflow tank, cold mark and hot mark,but check tank when cold and bring up to cold mark!!
Is antifreeze always supposed to be visible in the overflow tank?
Antifreeze should show up to the level line when cold normal but may raise some when hot and fall below some when cold. This is due to expansion and contracting from engine being hot or cold. A slight fall below this line can not mean much it can also evaporate some. A small leak can loose some but if you are putting fluid in everyday or two then you probably have a leak someplace.
Should you see coolant in your reservoir?
Yes , mine has a cold and hot mark , the coolant should be up to the cold mark when the engine is cold
Will water crack a engine block?
Yes. You can freeze the water, making it expand, or you can add cold water to a hot engine, shocking the block. You prevent freezing with antifreeze. You prevent shock by never adding water to a hot engine. If there is enough water in the engine to have the water pump provide circulation, you can add water SLOWLY, but you should really only add water to a hot engine when there is very little to add.
Checking antifreeze what should the engine temp be?
just not so hot that you burn yourself. checking before you drive is O.K.
When to check oil level. when engine hot or cold?
On the dipstick there is a safe range. You can check it either hot or cold. When cold the level should be close to the bottom of the safe range. When hot it should be close to the top of the safe range.
