Re: Installing pusher fan?

Posted by Owen_Dyneto On 2011/3/18 8:28:41

Any other tips on getting the most effective rust and crud removal

If you don't want to remove the radiator for a boil-out, there's always the old traditional method. First use a flush containing oxalic acid, then the neutralizer (carbonate). Then do a back-flush using a flushing gun that fits into the radiator hose and uses a combination of water pressure and compressed air. Disconnect both radiator hoses; do the radiator, flushing from bottom to top with the upper hose removed so the crap doesn't just go into the block. Then flush the block, also in reverse flow. When doing the block you might consider blocking the flow to the heater core, they can become pretty fragile with age.

The flushing guns used to be pretty common fare at flea markets though I haven't seen one lately. I'll post a picture of a typical one later for those not familiar with them.