Rust in cooling system

[Fierofool]

Deposits form pointed downstream.  An effective flush requires reversing the flow.  It's like scaling a fish.

[GTRS Fiero]

Deposits form pointed downstream.  An effective flush requires reversing the flow.  It's like scaling a fish.

The Thermocure (from Evaporust) is both a flush and rust remover.

With this, it won't matter.

[GTRS Fiero]

Had another idea last night, when you had the rust come back.  Did you by chance have the heater on, not sure if you get water flow thru the heater core if it is not being used.   Which could mean you flushed the radiator but not the heater core.  Just a thought....

I wonder...if you run the flush while the engine is not running, does it flush the core?  Coolant flows through the core when the pump is running, because it's forced to do so: pushed in, pulled out.

[NoMad]

The evaporust has you swap out your coolent for the revaporust mixture and water then drive it for a few days before dumping it.

[GTRS Fiero]

Yeah, running forward.

[TopNotch]

It seems to me that the only way to flush the entire system backwards would be to run the water pump backwards (if that would work at all). Anything else you did might cause backwards flow in part of the system, but not all of it.