Under the radiator cap is a gunky rust buildup on my 2003 Chev Impala w/108K mi (original owner). I've done 3 Radiator back flushes w/ the Prestone back flush kit. The old Anti freeze always looks good & clear. I've changed the thermostat once. I've released the pressure on the bleed screw until fluid comes out although I don't really know what I'm doing with that. Is the rust at the radiator cap anything to be concerned about?
Also, does anyone really believe the new cars can go 100 K before the first Radiator flush? Thanks for any advice!
Also, does anyone really believe the new cars can go 100 K before the first Radiator flush? Thanks for any advice!