My heater will not blow warm air until the engine temperature comes up to a certain temp. The engine seems to heat up normally, looking at the gauge. Until recently, I could feel the heater air warming up along with the engine temp. But now no warm air blows in until the temp gauge is showing just about 1/2. Gotta love these non-specific gauges 
Usually, once it hits 1/2 and the heat comes on, it's fine. And I can regulate fine, too. When full on, I get all the heat I expect.
This isn't a horrible situation, as it does eventually turn on. But if I get on the highway soon, before it gets to 1/2, highway speeds tend to keep it cool enough to not allow it to turn on. And when winter shows up soon, I may never get heat.
Thanks for any ideas.
Usually, once it hits 1/2 and the heat comes on, it's fine. And I can regulate fine, too. When full on, I get all the heat I expect.
This isn't a horrible situation, as it does eventually turn on. But if I get on the highway soon, before it gets to 1/2, highway speeds tend to keep it cool enough to not allow it to turn on. And when winter shows up soon, I may never get heat.
Thanks for any ideas.