Hi countrypair,
I too have the 05 ISC 330 HP. Here are my answers to your Qs.
1. Vent is vent and brings in air from the outside of the coach. If you move the switch to heat, you will get heat, heat and more heat. There should be two controls. One is a switch to direct the air flow to the vents of your choice. The other switch is a temp selector. Clockwise for heat and counter clockwise for cool. It takes a while for the setting to change. The compressor will be on only when A/C or defrost is chosen.
2. Your coach is like a freight train. It gains momentum. It does not accelerate. While my coach will gain momentum adequately, a gas coach will out accelerate it. It all comes down to weight. Coach and toad are 37.5K lbs. A gas coach is under 26K lbs.
3. The reservoir is in the engine compartment. It does have a dip stick. On my coach the fan is run by a belt. I'm not sure about your coach. The reservoir may also be for the power steering.
__________________
Gary
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
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