I have a 2000 Mitsubishi Montero Sport ES. Last winter the heat started blowing cold air. I took the hoses off the back of the heating core and flushed them out with a water hose and I also changed the thermostat. The heat started working again pretty much until the weather got warm enough to not need it. But now the heat is blowing cold again. Someone told me to check my radiator and when I did, it had greenish yellow deposits in the antifreeze/coolant. What should I do to try and fix this heating (or lack thereof) problem?
Oct 18, 2012 at 2:22 PM