Question about 2000 Ford Crown Victoria

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Hello, the blower works intermitent for colling and heat, sometimes it will blow on high and sometimes on a lower speed and sometimes not at all. I think i have narrowed it down to the blower motor speed controller or the EATC module. I had it supposely diagnosed at a Ford dealership and since the estimate was so astronomical Im guessing it was the blower speed controller since it requires much more labor. Any ideas, any internet dash breakdowns? Thanks, Dan.

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  • Ford Master
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SOUND LIKE BLOWER MOTOR RESISTOR OR AC + HTR CONTROL SWITCH CAN BE BAD.

Posted on Sep 30, 2009

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Why the air sometimes does not blow in a 2000 Isuzu Rodeo


Since it is intermittent. Check plugs to the controller and blower.

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Have a 2009 Nissan Quest I can't turn the heat off. Just stays on a high level of blowing out heat .


If you have a fan that has different speed settings (1234, or low med high etc) and the only one that works is high - then the blower resistor pack has failed. If you have a climate control unit (where you just pick a temp you want) then the fan is controlled by the heating system and it sets fan speed. If you have climate control style try lowering the temp to a lower setting (current temp in vehicle) and see if fan slows down. If not then climate control unit or fan resistor bad. If dial type and you get nothing on lower settings (only high works like mentioned above) you need to change blower resistor. It is located under dash near the fan itself. Look for small unit bolted in duct near fan with wire plug going to it.

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Why has my heating and my a/c stopped blowing any air


The main reason is a defective blower resistor. Normally the lower speeds on the fan switch go out first and leaves just the high speed working. Either your resistor is bad, the blower motor itself is dead, or you have a blown fuse - check the fuse box.

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My ac/heater fan stops blowing then it blows sometimes? The air is still cold just not blowing out. when it does blow it is cold.


replace fan speed resistor block if this only happens on lower fan settings if it happens on high fan speed also, replace blower fan

Jan 20, 2011 | 2001 Isuzu Trooper

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2001 pontiac grand prix, replaced blower motor, would only work on high, most of the time, at times it wouldn't work at all and when it did on high only. so I also replaced the resistor. I still only have...


Check for power at the HVAC CNTRL fuse with the blower set at any speed less than high speed. There should be power anytime the key is in the run position. If there is no power turn off the blower. If there is power with the blower off you need an ignition switch. The ignition switch is what supplies power to the lower speeds.

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It is very likely that the blower motor resistor has burned out. The resistor uses several resistors to drop voltage which drops the fan speed. Since high speed requires no drop in resistance it bypasses all the resisitors. Since none of the lower speeds work I would belt that the resistor for the setting just under high speed has burned out out. since all the other lower speeds use that resistor. Sometimes they will also have a non-serviceable internal fuse that will blow.

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Heayer doesn't work


The resistors provide resistance in the circuit, dropping voltage to the blower motor to slow the motor speed down. On high, the blower receives full voltage through the blower relay.

If you had High but no other speeds, then the resistor pack is usually the culprit. If you have all other speeds but high, the most common problem is going to be the blower motor itself, relay, or the switch panel.

You can check this by turning the fan speed to "high", unplug the blower motor, and check to see that you have roughly at least 12v at the plug. If you have 12v, that means the switch panel is activating the relay and the relay is working. Over time, heat kills the magnetic properties of the magnets inside an electrical motor. Without enough magnetic energy, you may not get enough opposing force to spin the rotor full speed when the windings energize, but still enough to spin at lower speeds.

Another thing you can check is the connector at the blower motor and the switch panel. Sometimes these will heat up, start to deform, and cause a bad connection. The bad connection may be able to handle the lower current draw on low speeds, but the higher resistance from the bad connection won't be able to handle the higher current while in the full speed position.

Hope this helps, keep me posted. be glad to help you get your heater working again soon.

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If the blower motor not blowing,and it is on high, bump the lower motor to see if it will try and start working again,if it does,replace the blower motor.If it does not,then replace the blower relay.If this only happens on the lower speeds,replace the blower motor resister,witch is mounted very near the blower motor in the blower box,with two screws,and about 7 wires going to it.

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Check the blower resistor pack - usually located in the heater air ducting in the blower fan airflow. Check for loose connections and open circuit resistors on the unit.
If speed 4 works always, its unlikely to be the blower motor ground connection.

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