  Two-dimensional Yang-Mills models in a pseudo-euclidean space are considered
from a point of view of a class of nonlinear Klein-Gordon-Fock equations. It is
shown that the Nahm reduction does not work, another choice is proposed and
investigated. A quasiclassical quantization of the models is based on
Feynmann-Maslov path integral construction and its zeta function representation
in terms of a Green function diagonal for an auxiliary heat equation with an
elliptic potential. The natural renormalization use a freedom in vacuum state
choice as well as the choice of the norm of an evolution operator eigenvectors.
A nonzero mass appears via the quasiclassical correction.
