The measured solar oscillation frequencies constrain the pressure-density
distribution in the solar interior but not the chemical composition (and
therefore temperature). We here consider models that satisfy the acoustic
constraint but have a high central hydrogen abundance and low central
temperature and show that the predicted neutrino flux is reduced but not
to the observed level. We also discuss different rates of mixing and show
that in a quasi steady stare the mixing rate does not affect the neutrino
flux.