e 32 is a "first stage overheat" I do all roadtech suggests and also "bleed" the air from the water pump (loosen bolt or thumbscrew on top of waterpump, while radiator cap is loose until coolant only run out, tighten bleed screw then top off radiator with the proper coolant). if using long-life (red antifreeze) then only use the same type of red antifreeze as previously used. not all antifreezes work together well.
the "wait five hours with battery disconnected" is not a guaranteed way to clear the codes. there is a key switch & foot (accel) pedal dance that can clear this code but it will not clear codes related to the pedals.