3 separate items.
Leaky hose (notorious item on Porsches which use spring clamps - always replace with worm clamps, aka screw type), Leaking heater core (Heat Exchanger in Porsche lingo) - replace, or cracked coolant reservoir - replace. In that order.
AC... cracked hose or bad 'o' ring - replace and recharge system.
Squeak... replace polyrib belt, belt tensioners and/or waterpump.
