Hey Cray, I do have a cheap HF heat gun.. It told me 180's I believe the last time. I didn't have it with me this past weekend to check when the alarm went off idling.
The intakes are clear.. I havent' changed the sensors, I may unplug try some tests and go that route...
Weird thing, it threw overheat before, I said the heck with it as it was raining and needed to get back to camp, couple minutes later it shut off so you may be on to something with the sensors