Where is heater blower relay for Mitsubishi montero 1997 model

The relay is in the fuse box in engine compartment. Most issues with your blower is the motor goes out or you have only 1 speed on your fan. If your issue is the speeds are not working, only the hi or low, then you have an actuator that has gone bad in the heater box. Check your relay first. If you still are having issues, refer to your manual for location and replacement of actuator.