Very rusty coolant
So I just looked at a 1999 Mitsubishi Galant ES(2.4L 4 cylinder engine) with 93,738 miles today. I took it for a test drive, and everything seemed great on it, looks like it's in great condition. But the coolant was extremely rusty, there were actually chunks of rust in it, it was more than just discolored. Everyone I've asked about it so far has pretty much said the same thing, "Could be the radiator, water pump, heater core, or the acutal engine block, depending on how bad the rust is."
Is there anyway for me to tell how serious the problem is?
If I flushed it out real good after I bought it, and maintained a 50/50 mix, would the rust stop or slow down?
Just wondering if the car is worth buying, like I said that was the only noticable problem. Any information would be great, thanks.