That does sound similar! With ours, if I opened the hood while idling in my driveway, the temperature would come down to warm vs. hot, and sometimes even start cooling. Every once in a while it work, but it failed fairly predictably on our very hot AZ days. I began carrying my thermometer around in my car and taking videos every chance I could, because being intermittent (yet stubbornly persistent and almost guaranteed when sitting at a bus stop or idling in a parking lot), it was much harder for the service department to diagnose. The thermometer would show the temp rising and falling, but never getting cool unless driving at speeds (and even then I would sometimes get warm air) When the dealership had trouble getting it to happen, I told them to park it in the sun with the hood closed, and then they were able to duplicate the issue. They began by replacing the compressor clutch, then battery. I believe they either replaced or checked the fans, then the entire condensor assembly. There was talk of fighting warranty again to replace the compressor. Honestly, I am not quite clear on the details anymore because it was such an ordeal, but each time they did a repair, they would quickly get it to work momentarily and move along. Either the techs aren't trained to repair anything that doesn't show up as a code when the diagnostic is run, or Honda was intentionally slow-leaking proper repair to increase revenue from the warranty department (the battles were part of the frustration & duration of our car being at the shop). We had a mechanic that we liked, and in Honda's only defense, I initially ran the problem by him and the intermittent nature did make it difficult to guess what was going on, hence using Honda's warranty. As soon as our warranty was up, we went back to our guy. The problem had progressed & I told him of everything that had been done. He immediately knew what part was suspect and he was right. Since my memory is hazy, I will call him tomorrow to double check that it was, indeed, the blower motor. It might give your mechanic something to troubleshoot. I can't remember the cost, but I remember thinking it wasn't that bad - I want to say $350-$400 or so and we haven't looked back since the repair a year ago.