Flare seepage

Hi
We have created model in Maya
exporting as .dts and bringing into torque we see the models at some places display the flare(sun)
through the model ,is that having a surface open on on side could be a reason but we need an alternative as we cant spend on more polygons for which will never be seen.
Please suggest some tips to over come this problem.

Thanks
p.ashok
MagicSoftware