  A simple model for the instanton ensemble at finite temperature T is
proposed, including ``random" and strongly correlated ``molecular" component.
  T-dependence of fermionic zero modes naturally leads to chiral symmetry
restoration, without instanton suppression. Moreover, at $T=(1-2) T_c$ the
non-perturbative effects due to ``molecules" are so strong, that they even
dominate the global thermodynamics. % two figures are enclosed as .ps files
