ok, attention smart people:

turns out, that there was a lot of sediment in bottom of overflow bottle blocking the tube, I just changed the coolant and it still looked nice, this truck has some serious sediment issues.

question 1: can mixing of green and orange coolant cause it to form sediment? I think previous owner had mixed them.

question 2: can sediment trapped in heater core cause the water rushing sound i hear in the dash?


I had the system power flushed and there is still a rushing sound from under the dash, dealer thinks it is the heater core.

he told me there was tons of sediment coming out of it, almost as if someone poured sand into the radiator.

would that get caught up in the core and cause that sound?

lastly, at this point, is there any other part of the cooling system that should be replaced since it was so plugged up with sediment? since it is apart to get the heater core, I want to make sure the whole system gets taken care of and we don't put in a new heater core just to get it plugged up again with sediment traveling over from another part of the system. should I replace the radiator and water pump while I am at it?