No
Yes
It is a fairly simple disassembly. I advise getting a book. http://www.marineengine.com/manuals/seloc/volvo_penta.html The above link is a source. If you are asking for the actual how-to, it is multi-stepped and requires a lot of input. Buy a manual! Y-THINK-Y
see "how too replace water pump on 2002 Trailblazer"
you have to access the blower through the glove compartment. open the compartment and press the tabs on the sides in the back of the compartment. look inside and the bottom right and you will see the blower motor, remove the three screws and the wire harness, replace impeller and replace motor.
On the V6 change it when you change the cam belt. On the 4 cylinder which has a cam chain change it when you have a leak or it fails.
While you are in there, yes.
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