In Reply to: Re: 2n water pump and cooling system posted by Steven P Frysinger on May 02, 2018 at 19:07:39:
After all those years, there will be much deposits (calcium, rust, etc.) in the lower block passages. I flush in both directions at full water hose flow to get as much out as possible, but I have no doubt that more remains than I remove. Do what you can. Sometime a radiator appears OK, but it is only flowing thru perhaps fewer than half the tubes. Feel them when running or if (& that is a big if) you can get a narrow beam IR thermometer you may detect tube with & without flow. IR camera shows what I found. New radiator fixed it.