Fighting Back Cooling System Corrosion

[Trav]

So I bought my 95 Runner about a year ago and I noticed some rust in the cooling system due to the PO running straight water in it... First thing I did was flush the system and installed a new radiator. I still noticed a lot of rust a few weeks later so I flushed it again. It keeps comin back and I was wondering if anyone has some advice on how to get rid of this short of getting a new engine and another radiator?

 

[KidVermicious]

So I bought my 95 Runner about a year ago and I noticed some rust in the cooling system due to the PO running straight water in it... First thing I did was flush the system and installed a new radiator. I still noticed a lot of rust a few weeks later so I flushed it again. It keeps comin back and I was wondering if anyone has some advice on how to get rid of this short of getting a new engine and another radiator?

Are you running the Toyota red coolant? Some people have corrosion problems with the other coolants.

 

[Trav]

No, Prestone 50/50

 

[KidVermicious]

No, Prestone 50/50

Try the Toyota stuff. It's expensive, but I've never heard anybody complain while using it.

It might be worth a power flush at a radiator shop first, though, just to make sure all the crap is out.

 

[graeaglecrawler]

Take the hoses off the heater core and back flush that by it self

 

[Bad_Vision]

you should drain out all the coolant then take off your upper and lower radiator coolant hose's take a garden hose stick it the upper radiator hole and run the water for 10 min then do the same on the engine side but on the engine side youll need to pull the thermostat.
let gravity do the work here the water will flush through the system and clean it out.
you may duct tape the garden hose to the holes so that the water pressure will force anything through.

 

[Trav]

you should drain out all the coolant then take off your upper and lower radiator coolant hose's take a garden hose stick it the upper radiator hole and run the water for 10 min then do the same on the engine side but on the engine side youll need to pull the thermostat.
let gravity do the work here the water will flush through the system and clean it out.
you may duct tape the garden hose to the holes so that the water pressure will force anything through.

Pretty much what I did the first time

Maybe a new heater core would help