I have a 2004 Toyota Corolla, with about 175,000 miles, and recently the heating system has been acting up. About three weeks ago the heat started to be slow coming, even when the engine was warm, but after a bit of driving it would kick in. The blower would work the whole time, but it would blow cold, instead of hot. However, no even that amount of heat has subsided, and the blower only blows cold air.
On top of that, within the last week or so the engine has begun to almost overheat early in driving, but settles down a bit after driving a few miles.
Anyone have any idea what might be happening?