I have an 03 TB Lt ext with no rear air at all. I have been reading some forums and tech sites and they don't completely relate. Because they either blow just cold or hot and not the other. Or fan works on high but not low. I have nothing at all in the rear but front works fine. I have seen a lot about blower resistor, but wouldn't that be if having issue with all air not just rear? Is there separate blower for the rear? Any help trouble shooting (I checked fuses already) would be very helpful seeing it -20 here in Minnesota. Thanks