Rust in the radiator
A little background...back in December I had the truck overheat. I flushed the radiator and it came out rusty. It overheated again. I took it to the mechanic and it turns out there was so much rust in the coolant, the water pump was bad, the radiator was half full of rust, and it had blown a head gasket. $2,500 later the truck is like new. The mechanic said he has seen lots of Rangers that just rust like that and I need to change the coolant once a year minimum to stay on top of it.
First, what is in an engine that rusts like this? It seems to me if Ford knew it was going to be inside of water they should have used something that WOULDN'T RUST? Secondly, is there a rust stabilizer that you can buy off the shelf that would at least retard the rust between changes? The coolant obviously isn't doing the trick and I always use top shelf fluids in my vehicle. Thoughts? Comments?