I'm looking for any ideas on this one, as it doesn't make much sense to me:'
I drove to get lunch, and sitting in the drive-thru line, turned on the heat. It was probably around 10 degrees Fahrenheit with the wind- chill. The engine was about 3/4 warmed up, at which point, I should (and have in the past) feel some nice heat. . But, all I got was cold air. Very cold air. Heater controls all looked good, so I left it on, and sat there, until the needle was vertical, and still, cold air.
So I turned the engine off, until I got my order, and fired it back up, and immediately had heat.
At the time, I turned the engine off, as I suspected a stuck thermostat, but later realized that the heater-core is always on the same loop as the engine as far as the coolant goes, so that couldn't be it. Any ideas? This is the first time this has happened, so I'll post more if it happens more.
Any ideas?