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Smoking after coolant flush
I have an '05 F250 that I bought a year ago from a Ford dealership. The truck has all of the service records with that dealer. It had 91000 miles (mostly highway) when I bought it and it now has 99850. Last Christmas, I put an Edge Juice w/Attitude on the truck but everything else is stock and I don't hot rod it.
Last week I noticed that the coolant was low. Since I had no idea what coolant was in the truck, I decided to flush the system and add new.
The next afternoon, I was leaving work and noticed that I was getting white smoke from the exhaust. When I was idling to pull out onto the road, white smoke was coming out the exhaust and it billowed when I pulled out. This is unusual because my truck rarely smokes in any color. I don't have much money so I kinda played the dumb blond girl thing with the guy at the local repair shop so he would give me advice without making me pay for a service. I don't know anything about diesel motors, but in a gas motor, my thought would be a head gasket. The truck has not been hot while I have owned it so the mechanic said he doubted it was a head gasket and leaned more towards my chip. I put the chip back to stock but nothing changed. The truck smokes at an idle, under power and it comes and goes periodically for no apparent reason.
The thing that confuses me is why I owned the truck for a year without any problems and now when I change the coolant, it smokes?
A friend suggested that someone could have put an additive in the coolant (don't remember what he said but it was like "iron seal" or something) that they use in big trucks for leaking head gaskets...?
Sorry about the long winded post but I am hoping someone can help me diagnose these symptoms without costing me a fortune. Thanks!!