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This is a common problem when the heater resistor goes bad. It is located near or mounted on the blower motor. Replacing the resistor module will fix the problem. FYI, Sometimes the blower motor is still working but the bearings are going bad. This tends to cause premature failure of the motor resistors. (So if the resistors fail again I would suggest replacing the blower motor as well.)
The blowers fail but so do the blower controller ( ballast resistor) There is a fuse and a relay involved too and the compressior will still work. Blower motor failure is common and likly. with everything on and the cover off the lower dash on the passenger side beat on the motor it may start running again. If it does it could work a long time but ifit happens again you know you need a new motor
If I remember right he relay is under the Plastic cover on the firewall where all the maxi fuses are . All under the fuses, But check the module beside the blower motor on the heater case under the hood they were bad for internally shorting out and doing the same cond your describing ...good luck
Follow the blower wires. I believe you should find a relay. I suggest testing it as well. Make sure it is good. Also make sure fuse is good and secure. Test your control switches and check all the vacuum lines and wiring
A/C/Heater blower motor may have an internal short or the blower motor resistor may be going bad. replace the motor and see if it fixes the problem, if it doesnt then a more in depth search may be in order by a repair shop.