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If it has been two hour then it shoulod be fine to remove. Id wait for about an hour after youve stopped driving just to be safe. Squeeze the hose and use this as a way to gauge the temp and pressure that remains in the system. Be careful out there. Wait until the car has cooled down. Use the adapter to check it 1st. So, wait for the coolant to cool before opening the radiator cap. It you need to remove it in a hurry while the car is hot then just get a towl and use it to remove the cap...bairly turn it at first to release the pressure so you dont get sprayed Use the hand pump to pump up the pressure listed on the cap. If you open it too soon, you'll have an explosion of boiling liquid in your face and on your arms. But a little trick I've been taught is if you can squeeze one of the radiator hoses and touch your fingers, then it's generally safe. You attach the pressure tester to the radiator. You should never open the radiator cap while the engine and coolant are hot.Opening the radiator cap while the coolant is that hot can cause the boiling coolant to surge out of the radiator and cause third degree burns on any skin it gets on - yours. Note- I have quite a large scar from coolant burns, and I didn't open the cap while hot. You should never open a hot-to-the-touch radiator cap, as you are risking a spray of pressurized coolant that could cause serious burns. When in doubt, wait. If you open the cap while it's still warm, you may burn yourself with steam or hot coolant. Pump up to the pressure listed & see if it holds pressure. Tests the cap to hold pressure. Think about it this way: the radiator is designed to take heat off your engine, so it has to be able to cool off in less than 10 hours. Grab one of the radiator hoses and if you can bear holding it for more than 15 seconds you should be able to open the cap. The liquid going through the radiator can be at boiling temperatures and the vapor can cause severe burns. Things can go wrong quickly. Your radiator cap is a small part that plays a big role in keeping your engine from overheating.There are several warning signs that your radiator cap is not working right: 1. This cooling process could take as long as 30-45 minutes, but will save you from dangerous burns. Remember: open it only after the engine has completely cooled. Open the cap slowly, as if you were opening a bottle of soda that has been shaken up. Cap will show the pressure listed on the top to test that you go by. Radiator cap off, Engine off. --- Full the reservoir, put the cap on and see what happens. You have a coolant leak: If your coolant is leaking, it could mean your radiator cap is bad.If the cap isn’t releasing excess pressure properly, that … Ideally until the motor is completely cooled off and you can touch the exhaust manifold and it be cold. When the cap is off, the coolant boils at a lower temperature. [2] X Research source "what happens when car runs without radiator cap on" - it depends on how long it was off and what happened. Open the radiator cap with a rag. Wait until your car’s engine has cooled down completely before opening the cap, or simply check the coolant level before turning on your engine. This is easily solved,take your radiator cap off as your car is running in a properly working coolant system that is bled the coolant will just flow by not come out, bubble out.Pressure regulated by the cap dosen't build until the engine reach temp from the expansion of fluid/vapor and even then at operating temp you should be able to vent the pressure remove the cap … When you’ve waited at least 15 minutes and the hood is cool to the touch, put on gloves, open the hood, and locate the radiator cap (consult the owner’s manual if necessary), says Reina. 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