Maybe it is some coolant residue that you are smelling now because the air is flowing over the heater core....
If it is leaking there.....you should see some coolant come out someplace (might run out the drain that the A/C water comes out.....in the firewall).
Squeaking might be from oil/coolant getting onto the belt....only solution for that would be a new belt....make sure that all the pulley surfaces are clean before installing the new belt.
There is a Idler pulley right next to the water pump.......and the power steering pulley, and the alternator pulley.......
My idler pulley was making a groaning noise....only above a certain RPM.....so I could not detect it by spinning it.