If you are using a cooling system flush, try RMI 25; it gets everything off including hard-water scale. It is not a bad idea to run the cooling sytem into an old drum with the top cut off, so that any scale etc. can be caught in the drum, rather than blocking the radiator. From memory RMI 25 has to be circulated in the system for 15 hours before changing the coolant, but it is worth doing. Some sort of seive on the outlet hose in the drum is a good idea, to stop the muck being sucked back into the block,
Cheers Charlie


Just ordered a new one.
now have to order another. can't run the car for a while yet to clean out the radiator and block of crap
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