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No hot air could be anything from a defective thermostat to a control module needing replacement or possibly just a software update for the climate control module! You should take the car to a Volvo specialist and have them diagnose it for you. This way you'll know what needs to be repaired instead of guessing and maybe even spending money on repairs not needed.
At the MINIMUM, you need to follow the manufacturers recommended maintenance schedule. On top of that, you need to get yourself a Volvo repair shop that knows what to watch for and follow their recommendations as far as any additional repairs or fluid maintenance that might be needed. This will make your car last for many miles/years!
I'm not sure what your questions is? What are the symptoms? What dtc's if any are present? What repair does the shop recommend?
you need to use fluid part # 1161540 or trans fluid Mobil 3306 or the equivalent. As far as power steering fluid, use pentosin chf 202. Yes, I'd recommend that you do a complete transmission fluid flush so all old fluid gets removed and replaced with new.
Contact your local Volvo dealership. They should be able to help you get the code.
Need more info. When does it happen? Cold or Hot? Low or high rpm's? At speed or in neutral, etc?
Without looking at the car, it will be almost impossible to say what's going on. Could be the switch itself, but who knows. Bring the car to a Volvo specialist and have them diagnose it.
If it's leaking bad you need to either replace it or repair it, depending on the radiator design. Stop leak and or any type of additives that are designed to reduce small leaks might reduce the actual leak problem, but will eventually cause other problems that can cost more to repair. I would say be very careful when using any additives in engine and trans since most of them have side effects that can be costly.
You have to remove the top part of cylinder head and reseal with special sealant. However, ZeeTech is right in that it's a pretty complicated repair that takes a few special tools to get everything back together correctly and without doing damage. Bring to your Volvo specialist.
The smoke can be normal due to leftover grease, but more likely from the paint that is used to cover the center "hub" are of the rotors. My experience with these are that after driving to get the brakes hot enough to produce smoke after coming to a stop, then it will usually subside very quickly. If it still smokes after driving for a day or so of driving, take the car back to have it inspected.