Yes, there is a rear blower motor. It is located in the center console, beneath the gearshift. You pull off the kick panels (the ones that are half plastic / half carpeted) to get to it. Do a search on "grrr" and you'll find a good, long post on problems with the rear a/c. In this post there are photos and step-by-step instructions on how to repair the transistor. But it also has pictures of the rear blower motor and the often dirty screen that covers it.
You can also link to it from the FAQ that Midnight has published and I link to in my sig.
FYI, if you need to remove/replace the rear blower motor, it actually comes out from the passenger side. Getting to it, removing it, and cleaning the screen are all very easy DIY projects.
4 wheels: 2001 Black MDX - Over 200,000 Miles (gone now), Car: 2014 Infiniti Q50 Hybrid AWD, 2 wheels: 1987 Original Fat Chance, 2005 Giant VT-One
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