2004 Chevy Astro van blower motor resistor

I was wondering if any one knows where the blower motor resistor module is located on my 2004 Chevy Astro Van. The blower only seems to work on Med-High speed only. It doesnt matter if the A/C is on or not. The blower only works at that speed only. I was told this is a common problem. Any ideas?

[b]Look in the area of the blower motor under the passenger side dash. They mount these in the blower housing so that when the blower is turned on it cools the resistor block. Sometimes the glovebox has to be removed to gain access to the resistor block.

Tester[/b]