I have a 1988 Fiero 2.5... The fan for heat and a/c does not turn on when fan speed knob is set to any of the lower speed settings and only sometimes turns on when set to max. I don't know what would cause the fan not to work on both low and high. The blower motor resistor is fine. Im not sure about the blower motor relay though. I don't know what to test or replace to fix this problem. If anyone has suggestions on what to chek I would greatly appreciate the help!
I checked the resistors and they had power, so I decided to check the blower motor again and after unplugging and re connecting the wires the motor is now getting power on the 3 lower speeds but not on max. The motor though is still not doing anything when it has power. I guess I do need a new blower motor.