for a couple days white smoke comes from my car’s exhaust after some heavy rain we had recently, mechanic told me he found water in the exhaust so he replaced some gaskets and emptied the water out, now when my car heats up white smoke (steamish not thick) comes from the exhaust but none when cold, dont know if its a head gasket or something else. (i dont drive the car that much, i only let it warm up for 30-40 minutes a dayish)