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The blower motor for thr heat/AC just stopped working. I've checked the fuses and replaced the resistor in the spring. Is there some other relay anywhere?
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What's next? Auto repair shop. lol
You check all the fuses ? How looking at them ? Did you check for battery voltage across the fuses using a voltmeter ? Did you look at a wiring diagram to see what all is involve in making the blower motor work. Just replacing parts is not how to fix the problem.
There are several possible reasons why your blower, vent, defrost, AC, and heater might stop blowing air:
1. Blower Motor Failure: The blower motor is responsible for blowing the air through the vents. If the blower motor fails, you will not get any airflow from the vents. 2. Blower Motor Resistor Failure: The blower motor resistor controls the speed of the blower motor. If the resistor fails, the blower motor may stop working or only work at one speed. 3. Fuse or Relay Failure: A blown fuse or faulty relay in the blower motor circuit can prevent the blower motor from working. 4. Control Module Failure: The HVAC (heating, ventilation, and air conditioning) control module is responsible for controlling the blower motor and other components. If the control module fails, it can prevent the blower motor from working. 5. Vacuum Leak: If your vehicle uses a vacuum system to control the vents, a vacuum leak can prevent the system from working properly. 6. Broken Blend Door: The blend door controls the direction of the airflow. If the blend door breaks or gets stuck, the air may not flow through the correct vents. 7. Wiring or Connector Issues: Faulty wiring or connectors in the blower motor circuit can prevent the blower motor from working.
You should have checked for voltage at the blower motor connector before replacing the motor .Could have a bad blower motor resistor, this part controls the different speeds . Have you checked for blown fuses ? There could be a bad blower motor relay ! Need to know year an make an model to check out wiring diagram to see what is involved in this circuit !
In the beginning you should check for voltage and ground. The 50amp fuse marked AC powers the blower motor and the motor is grounded. The high speed relay bypasses the resistor. So you should have power coming from the fuse and thru the high relay. Then the resistor for the other speeds gets power from the heat and ac control module which also controls the blend doors. You may need a shop manual or repair book to get the diagrams.
The answer is that there is dirt dust and fuzz built up in the brushes of the blower motor. Had to figure this one out myself. Remove glove box, carefully disassemble bottom of blower motor, remove brush cap and brushes clean up mess and reassemble. Not for a novice but if you're a thinker you can figure it out. Mine has worked every time since. The Pontiac guys had no clue wanted to replace motor.
Motor is also energized by a relay. check that and also check that the motor itself is good by running a hot lead right to it. I'm sure you already checked the fuse and know the switch is good?
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