I need to flush the cooling system in my 89 LWB, I don't know when it was last done. From what I read I just drain the coolant, fill it with some kind of cooling system cleaner, drive it around for 1/2 hour with the heat on hot, then drain the cleaner and fill with coolant.

Is this the correct procedure? What is the best cleaner to use?

Thanks,
-Colin


1989 Montero 4dr V6 3.0l