[molehole]

Never put straight water in the radiator because it dilutes the antifreeze and may cause it to overheat! Only put DEXCOOL in diluted to 50/50. Change your radiator cap to a non-GM cap because they let air in the system. No a windshield washer jar has nothing to do with the cooling system. I would flush the radiator and putin new DEXCOOL 50/50 diluted with a new cap and check it everyday for a few days until all the air is out of the system. Good Luck