it's an 89. Inspite of the open thermo, I don't think it's running cold. On the contrary, ever since I reverse flushed the heater corethis past October, for whatever reason, it is running hotter this winter at 210 ish than it did last winter at 185 ish. And last winter my heat did not work didlysquat and this winter it gets pretty hot in the cabin. Also, the coolant started turning brown which never happened before I reverse flushed the heater core.
Either way, as long as my engine is running hot (but not over heating), I am Ok then?