hi guys i saw a puddle under my car of coolant in my works parking lot when i went to go lunch so i topped it off with water maybe just a 1/4 of gallon turned the car on popped the hood to see if i could find a leak but didn't see nothing dripping so i drove about 7 miles as i parked the car i now see dripps of coolant leaking it seems to be coming from the middle of the driver and passenger side towards the radiator area as i saw the leak going on to the protective splash shield but so i topped it off with water then i drove back to work the when i parked and turned the car off, the coolant is full and the car didn't leak not even a drip of coolant so after work i i headed home i was on the highway in some serious traffic i was scared because i thought my car was going to overheat due to the coolant leak, but as i got home no coolant leaked once again? what type of coolant leak can this be? the radiator is 1.5 years old replaced with a brand new one; i mean if it was the radiator wouldn't it leak all the time when the engine is warm? again what do you guys think it is? a hose?