I'm kinda baffled on this on. I changed the water pump and thermostat due to the old water pumps bearing shot it on me. Got it all back together and drove for a day with no problems then drove around 50 miles wit no problem but got backing to head home and started overheating 3 or so miles on the way back put about a gallon of 50/50 and made it home. Next day I have add a gallon again to try and find a leak to no avail. Will only leak when I drive which makes it hard to spot. It's drivers side leak( coolant everywhere on drivers side) but need ideas where to look or what it might be. I don't think head gasket no coolant in oil and no smoke at all. Any idea would be awesome.