Heater out of control?

[rfsully]

2005 Pilot: Set the cabin temp to AUTO/62 degrees. Heat keeps coming and coming, cabin temp keeps climbing to something like 80 degrees. This only seems to happen when actually driving the car, not when it is at rest. The Dealer can't reproduce the problem, because they test by letting the car run in the parking lot for an hour and then checking the temperature. It doesn't occur under those conditions. "Works as designed" is their story.

[rocky]

Can you reproduce with car revving not idling at rest?
Right now I'm stumped on this.

[94eg!]

Does it do the same thing weather you have the intake air set to fresh or recirculate?

I notice a big difference in blower temp when I set it to pull air from the outside vs the inside. I wonder if the blower is able to draw cabin air into the interior temp sensor (tiny vent by your knee) effectively when it's set to fresh. There can be quite a pressure differential between outside and inside at speed which just might cause air to flow the wrong way across the sensor (measuring intake air temp instead of cabin temp).