ABOUT THE ONLY WAY THAT WASHER FLUID (IF THE TANK ANT CRACKED)can get out of the tank AND THAT IS THE pump pumped it out. sure you didnt use the washer when you started up the motor this morning? the best way to check for a coolant leak is with a presser tester, but you would have to get someone to do that for you, but it might be worth it for the satisfaction of mind.