so finally all the parts i ordered from tasca volvo have arrived and i'm ready to replace my radiator, hoses, and heater hoses. i had two questions about the job as i've never done it before:

1) is it necessary to "flush" the coolant if I'm alread taking out the old radiator and putting a new one in? If so, what is the best way to do this flush, after I've drained as much coolant out as possible? Can I just put a garden hose into the upper radiator hose?

2) (this is going to sound like a very stupid question) what's the rule of thumb for how tight to make a hose clamp? I always seem to overtighten everything, and I don't want to break any of the radiator fittings.

also, totally unrelated, but I bet one of you wizards on here knows the answer to this as well: the back winshield wiper (its a wagon) doesn't turn on, though the cleaner fluid squirts out. Is there an easy way to tell if its the motor that is bad, or some other fault in the wiring? i'm assuming it isn't the fuse, as that fuse seems to cover the stereo as well, which works.

thanks!