Defective Blower Motor Resistor Pack.
Probably the blower motor, wiring to it or control switch
Could be the drivers.
A bad radio speaker
short circuit in the circuit
transmission leak in reverse only
Partially clogged fuel filter or the pump is failing.
start with checking thermostat
You don't say the reason for the blower motor replacement. Did it not blow ? If that be the case, and you do have a new blower, check for 12 volts to blower. Could also Abe a malfunctioning blower module. Now if its blowing COLD air, well , replacing the blower moter wont make it blow warm. There could be numerous causes of that problem
You might need transmission fluid !?!?
car door light stay on