Noisy Workhorse engine fan

I appreciate all the well thought out comments. Hadn't even occurred to me to plug in my scan gauge and do some data logging to see what's actually happening temperature-wise. I also hadn't thought of finding a way to add some extra air flow into the engine compartment with dryer hose. I'll look at doing that right away. I already insulated the doghouse as mine was just a fiberglass shell with the interior carpet serving as the insulation. On truck engines I prefer to run a cooler thermostat as it's unlikely to provide any noticeable mileage improvement. I'm sure the main purpose of it is to get the engine hotter faster to help with smog control. I'm assuming nobody here has used the waterless coolants yet... I should also mention that we have used the RV extensively in the past few months with the heat wave out West here. Despite climbing the Sierra and being in 100+ degree heat, the motorhome never ran the needle past 1/2 way. The dash air was severely taxed during this and we were sitting in two small pockets of cool directly in front of the dash vents. If we had had any more passengers we would have had to resort to the generator and roof air as the rear of the coach was pretty toasty!