If your car is overheating, one of the first places to check is the radiator cap. The radiator cap helps maintain proper pressure in the cooling system, and if it's not working properly, it can cause the system to overheat. Testing the radiator cap is a simple process that can be done at home with a few tools.
To test the radiator cap, you'll need a clean rag and a pair of pliers. First, remove the cap from the radiator and wipe any dirt or grime off of it with the rag. Then, use the pliers to gently squeeze the sides of the cap. If you feel any give or see any cracks, then thecap needs to be replaced. If the cap feels solid and shows no signs of damage, then it's likely still in good condition and doesn't need to be replaced.