This weekend I made a small update to the project. I put together my
RBBB (really bare bones board) arduino kit. This will be what will eventually be used in the car after all the tweaking is done.
dustybarn, I don't see why an ambient temperature sensor would have any bearing on the actuation of the grill block. The only thing I care about is not getting the coolant too hot so the fan doesn't turn on. Yes, ambient temp is going to affect that, but I don't actually care about ambient temp, just the coolant temp. I still want the car to warm up as fast as humanly possibly even if its 120 degrees F outside. Only after it is up to temp should the door open up.