1. using a blowout plug with compressed air into the city water inlet, will that dry the fresh tank if the petcocks are open, or will the check valve resist the airflow as it would the water? If that won't work, how can I dry the fresh tank? there is water adhering to the top of the tank. Alternatively, what if I blow air through the fresh water tank filler? Is there an adapter for that? The adapter I have is specifically designed to vent air so as to not pressurize the tank.
It will not blow out the fresh water tank, just open the valve for the fresh water and let it drain, then close the valve. Don't worry about it being dry, you will need to sanitize it when you are ready to use it the next season. If it's empty there isn't much to freeze so no expansion of ice to worry about.
What is the need to have it bone dry?
2. what happens if i blow the air through and do not do anything to the hot water tank such as open the drain valve?
There is a bypass valve that will shunt water to the heater but you need to close the cold water inlet valve and hot water outlet valve as well as the crossover. Your owner's manual will tell you the location of these valves.
Why do you want to leave water in the hot water heater?
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-Rich
Rich & Yvonne
2006 Safari SE -Dora-
2004 4Runner SE 4.7L V8
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