When the engine has completely cooled off, get a radiator cap tester and put it on top of your radiator. This nifty device will allow you to pressurize your entire system, which will check a few different problems for you. If you don’t own one, don’t worry, most part stores like AutoZone will let you rent one for free. Driving through high water can have a disastrous effect on your car’s engine. This is what happens when you drive your car through high water. More information https://telegra.ph/Keeping-Your-Ride-Smooth-The-Importance-and-Cost-of-Tire-Balancing-05-31 If water enters your engine it can end up rusting parts out like your differential and then you’re not going anywhere. Table of Contents Show. When a piston reaches the top of its travel range, if the volume of water inside is more than the amount of space left, hydrolock will occur. This advertisement has not loaded yet, but your article continues below. If either of these occurs, don’t panic. Your car will return to normal once the cleaner and residue burn away.