2003 Trailblazer right side/passenger heater not working

Hello,
My wife owns a 2003 Chevy Trailblazer. She noticed the other day that the light on the right side (passenger) was not illuminating. Now she says that there is no hot air blowing out (or even the fan) on the
right side.
What should I be looking for to try to troubleshoot this problem? Is there a fuse just for this component of the Trailblazer?
Thanks.
Mike
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Http://www.trailvoy.com will prolly have the answer.
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