Driving down the road and the power steering went out. Lifted hood, and belt is trying to turn but slipping. Looks like radiator may be starting to let out steam. Any ideas?

If you knew how vehicles work then maybe
does belt drive alternator ? (charges battery ! )
does belt drive cooling fan in back of radiator ?
does the belt drive the power steering hydraulic pump ?

Check your power steering fluid to see if it is low. Also look to see if it looks like the belt is slipping. You may have a power steering pump that is failing.

Power steering belt may be slipping or there isn't enough fluid in the reservouir of the pump.

Most common cause is a internally plugged radiator.
The water and coolant often react negatively to the metals and rubber inside the passageways to clog the radiator over time. If you wish to try to "reverse flush " it yourself, ask "fixya".
Other causes may be: Stuck thermostat, plugged fins of radiator outside, water pump slipping or starting to fail by "freezing up",
loose or slipping serpentine belt, and problem with the engine cooling fan.

Check to see if the serpentine belt is broken or has come off the pulleys. One belt runs the power steering and water pump. If the belt is broken or has fallen off, it will need to be replaced.

If the belt gets wet and flies off, or starts to slip, the power steering and alternator will stop spinning causing this condition.

Check belts to see if they are still on the truck and spinning the pulleys of the alternator and power steering pump.

It souds like the same problem i had a few months ago, have your timing belt checked, i am most certainly sure that it is the belt, usualy the belt breaks, or slips off the pulley.......hope this is helpful.

check the eps fuses (if applicable) if not then check the drive belts

no idea
take it to an accredited service center for a proper diagnosis and quote
initial cause was probably a lack of pre use inspection

You have to replace the whole balancer