Blower works, but the four rates on Dial are beginning to fail. Faulty Dial or ?.

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.

Because the first three speeds are not going through the same power feed configuration. You can check the speed switch but I do not think that is it. Kind of hard to fathom three contacts all going bad at same time.

Rather you might want to check the schematic and you might discover that the first three speeds of the blower go through a special circuit powered by your car's ignition switch!!! If that part of the ignition switch goes it affects your ac blower - and don't be surprised if your rear lights and some other stuff is not working also!!!!!

{: ) If the front a/c and heater is working fine, that's good. At least the problem can be isolated on the rear HVAC circuits only.
Check first the RR HVAC fuse 30amp at the underhood fuseblock and the IGN 3 fuse 10amp at the IP fuseblock. If you found them good, then you can begin diagnosing the blower circuits wirings and connectors.
A faulty blower definitely will not give any output. If it doesn't spin for some reason, rear a/c or heating cannot be circulated.
A faulty blower resistor or speed control processor can also cause a zero air output. Sometimes, the blower may only work at certain speeds only.
A faulty rear HVAC control switch may not give the proper signals to the blower resistor or speed controller, and in turn will render the blower motor disabled.
Sometimes it can be a terminal connector being loose or burnt. However, the most usual cause for this type of problem is a faulty blower resistor.

the blower motor resistor board has failed.relatively inexpensive and easy to replace.dealer only part.its located next to the blower motor and is held in by two phillips head screws.the only word of caution i will give you is that if it fails again in a short period of time you should replace blower motor as it is drawing too much amperage and damaging resistors.

IS IT THE BLOWER MOTOR OR THE CLIMATE CONTROL UNIT ..ALSO THERE IS A IN LINE BLOWER MOTOR RESISTOR THAT BOLTS IN TO THE LOWER DUCTS WHEN THOSE GOT OUT IT CAN ALSO CAUSE THE BLOWER MOTOR NOT TO WORK....HOWEVER IF ITS THE BLOWER MOTOR ANY FROM 95-99 NISSAN MAXIMA WILL WORK ALSO I THINK THE 95-99 NISSAN QUEST WILL WORK..CLIMATE CONTROL WILL WORK FROM OTHER MAXI'S AS LONG AS IT'S THE SAME TYPE(ELECTRONIC OR DIAL TYPE)

check 4WD fuse also fuse and relay to heater blower.if all is good remove and hotwire blower motor using jumper wires to battery.if blower motor dont work replace it.if it work you have a faulty blower switch or resistor bad.

no,i would say it is the blower motor resistor,if you follow the blower motor wires they plug in to the resistor.

There are usually three possibilities for this problem, which can only be solved by hands-on electrical testing, in most cases. You could have a bad switch, you could have a bad blower motor, or you could have a bad blower motor resistor. If the bearings in the blower motor begin to seize, it will take more force (read: more electricity) to turn against the friction of the bearings. This may explain why it does not work until a higher setting, and even then it may not work well. On the other hand, if the blower motor itself is okay, the delivery of electricity may have a problem. Your blower motor has a resistor, and this resistor can over time go bad, even rust, which will not allow the full amount of current to reach the blower motor, thus causing it to not run. I usually replace blower motors with a new resistor, but if just the resistor is bad, then only replace that. The switch thing is uncommon, but it is still a possibility, and I can't rule it out. Good Luck finding the problem, barring a complicated electrical issue, it should definitely be one of those three things that has failed.

Thanks for asking!

there are four settings on most blower motors. two of yours are prolly bad. replace the blower motor. if that dosnt do the job then it is more than likely an electrical issue and you will need to take it to a shop to have them diagnoss it.

CLICK HERE for a schematic of your blower.

Your blower is not shutting off - so your BMCP (Blower Motor Control Processor) has malfunctioned... or the HVAC Control Module has failed.

Both provide power to the blower motor.

To check which one has failed - pull the HVAC control fuse RADIO/HVAC/RFA/CLSTR/ALDL (15Amp) and see if the fan shuts off - if not - try the BMCP fuse HI/BLWR (30Amp) - Both are listed listed at the top of the schematic.


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