Yep, the output is limited to between 25% and 90%. I've put a dozen or so trips on it in the last couple weeks and it's still working great.

Andy: I'm debating sending you an (ugly) box that has a display to show you exactly what it's doing at any given point (it shows the target temp, actual temp, and the fan output percentage). You'd have to extend the temp sensor wires and the fan control wires to the cabin to where you can watch the screen. Otherwise we'll be guessing as to what it's actually doing.

I can also send a programmer so you can update the code if we need to make any changes. Sound like a plan? I can probably send it off to you later this week.