SW20 Cooling System Maintenance
Hi guys, I have read the How-To thread on cooling system but I'm not sure about my 1990 3SGTE MR2 situation.
When I pulled the dipstick/snorkle on the cooland overflow path I found it silted up with sediment, presumably rust. It seemed to be blocking the gauze filter at the end of the snorkel which I cleaned out. The radiator cap also has a sludge layer when I removed it. And it comes back if I wipe it off. So I read the MR2 manual section and watched a few YouTube coolant changes, bought coolant flush, demin water, red coolant and expected to be flushing the system a number of times. I removed the undercovers and opened the main drains on the two front to rear coolant pipes and the coolant that I drained was a beautiful clear red coolant.
If the circulating coolant looks good any idea why the sludge is appearing on the radiator cap and the overflow path? Or how I could get rid of it? The how-to PDF doesn't get into this sort of complexity.
I haven't attempted any flushing until I understand this.