i have an 04 dodge diesel, about 4 days ago i my truck started to get hot an anti-freeze coming out of the overflow tank so i changed the thermostate an the next morning i was driving an the heat went out then the truck started to get hot an pegged out the temp guage an then went back to normal an still pouring out of overflow, so i have changed the radiator cap an the water pump an the problem is still there still draining in to the overflow, if anyone can help or has an idea of whats going on im open to anything

 

sounds like something is plugged up. heater core, radiator, something along those lines i'll guess.

 

Give it a good flushing, new antifreeze, mixed properly. Then see what happens.

 

you need to flush and back flush the whole system... don't keep driving it else you'll end up with a lot more problems....