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I have a 1999 f250 with a 7.3l turbo diesel. I started it and it made a pinging noise extremely loud and blew a lot of white smoke. I checked my levels and my coolant was low. I put more coolant in and it went back to the same low level it was at when i first checked it. I checked my oil dipstick and theres no trace of water. It was raining but it looked like there was fluid coming from under my truck. It had that rainbow look like oil, but it was under the coolant on the drivers side. Im lost on this 1, I dont think its my head gasket because theres no water on the dip stick, I think it may be my water pump. But not sure. Any input or ideas would be greatly appreciated.