first thing to check is the fuse
Blower motor, resistor, wiring or control problem are common causes
The problem exists somewhere in the circuit for the HVAC blower. Check fuses and relays. If they check out, check for power and ground at the weatherpack terminal which connects to the HVAC blower. If that checks out, then your blower motor is probably bad.
is the blower motor running? or is it just not blowing hot air?
My blower would blow cold air at idle & engine would start to overheat, I replaced my thermostat & problem solved.
Dodges are good for blowing fuses. If that is not it, the fan switch might need replaced.
Motor hasseized.
If the AC stopped blowing air on your 2003 Toyota Echo, the blower fuse could be to blame. If the fuse is fine, it might be the blower resistor that needs to be replaced.
Soot blowing is done in air pre heater by a blower called swing blower which is different from half retractrable or full retractable or deslagger.
Your heater coil is bad.
Dead short in system Try disconnecting: Wiring to compressor Wiring to blower motor to try to isolate where problem is
i think it probably because the motor has a ground problem or it has bad brushes and is is drawing to much energy for the resistor
Blown fuse, defective blower motor, or defective blower motor resistor pack.