My 2003 Olds Silhouette has developed an odd problem. When idling with the air
temp set to heat, it blows cool air, and my engine temp rises. When I get up to
speed after a few seconds, the heat blows hot again and the temp goes back down.
I have 190,000 miles on it, and have had no other major problems except having
the water pump changed out a couple years ago.
Last time I had my coolant flushed was a couple years ago. I have not
checked my coolant levels yet, I keep forgetting to follow-up on this.