I'm changing my gf's coolant this weekend.
It's very rusty and sludgy so I got a bottle of radiator cleaner. You add it to the coolant, run engine for 20 min, drain the coolant and then it says to flush the system.
How do I flush the coolant system?
I've been reading that reverse flushing the system is the way to go - so do i just stick the hose up the drain plug and crank up the pressure or what?
Thanks guys
Greg