What happens if you accidentally put windshield fluid in the coolant?
Also, can you use windshield washer fluid as engine coolant?
It'll be fine for a while until you can get around to replacing it with proper coolant, but don't think it's okay to swap out windshield washer fluid for antifreeze. yes, you will need to flush your coolant.
Secondly, can you put windshield washer fluid in while the car is hot? Because fluid can expand when heated, it's important that you do not overfill the reservoir. When the fluid warms due to the high engine temperatures under the hood, the pressure could cause the reservoir to crack and leak if there is too much fluid in it.
Similarly, you may ask, will windshield washer fluid hurt your radiator?
Windshield wiper fluid contains a small amount of soap, which will rapidly expand as the coolant gets hotter. This can cause radiator or coolant lines to become clogged. If the engine was started after adding the windshield washer fluid, it's probably best to have it flushed to be on the safe side.
What happens if you put wiper fluid in the coolant?
Windshield wiper fluid is mostly water, so it will simply "cook off" when the engine heats up and the remaining chemicals will have no effect upon the antifreeze or the vehicle's cooling system. The only significant danger is that it might react with the existing antifreeze, causing all your coolant to turn into a gel.