#1 That coolant line comes up from under the intake manifold; Runs to the ISCV (Idle Speed Control Valve); Returns to the engine at a small nipple which is part of the lower intake runner's flange by cylinder #2.
#2 Hard to say from that picture, but it is the nipple that the vacuum control unit connects to via the fabric wrapped hose on the bottom? Black plastic unit with three nipples which is mounted a bit above the EGR control valve.
#4 Power steering udle up vacuum source. It connects to one of the nipples on the vacuum switch mounted to the rear of the power steering pump.
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