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blower is not running full speed? on high?
the blower has this resistor block on many cars,
that fail, easy. (burn up) but not ever on high. (bypassed then)
a big clue that. no?
is the blower slow or just dampers closed and cant feel it.
surly you know the sound of your blower on high, sound !
air flow is a whole other more complex matter.
also is battery rested voltage at 12.6v? if not you have discharged battery making fan weak ( power = volts times current. so....)
a couple of things,1 blower motor fuse.2 blower motor gone out.3 switch on fan speed control switch not sending signal to fans.after checking the fuses.next check theswitch on control panel.set ac or heater.if fan still doesnt come on then replace it.when it work and then stops working there are a lot of possiblities that caused the prob relay too not fliping over inside staying close loop.hope this helps.