Question about 2000 Jeep Wrangler

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When I turn the A/C on high the fan sounds like its hitting something and when I turn it down to position 3,2,1 it doesn't work at all. All the heat setting work but still makes the noise on high speed

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  • Richard Scordino May 29, 2010

    Either the blower motor is failing or you have something stuck inside the tunnel...Either way you need to remove the blower motor and check it out.

  • brenrek1795 May 29, 2010

    Cool thanks can you watch my kids for a few minutes so I can take a look?

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Sounds like a fan blade has broken.

Posted on May 29, 2010

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Why does heat-air fan only work on high


Can you tell that the fan is getting higher or lower? Or is there no response from the fan control until you get to the high position?

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I'm getting an intermittent loud flapping sound when the AC is turned on my 2009 Smart ForTwo


Question. Is the flapping at a very fast pace that would indicate the speed of a fan blade hitting something? If so, you may be on to something there such as a misplaced gasket or something has dropped/fallen into the blower box via a vent.

If it is not that speed then see the following..

Hope I can give you some direction. Speaking from a generic sense all ac/heaters these days have a door or doors in the blower box that control air flow from the main part of the box to different positions when you ask for vent, heater, mix, defrost etc..

Most these days are operated with a small electric servo/motor and unfortunately the mostly have plastic gears that wear and can "thump-thump" as the motor cycles trying to open or close the flapper door.

Try to change the air direction from Max AC to regular ac to heater, defroster, bi-level etc all with the AC switch in the on position if you have a separate on/off switch.

Listen to the sound and see if it comes and goes with a different location of the selector switch.

One last question. Does it happen at idle or driving down the road at any particular speed?

Lets start with that and see what happens. This is interesting.

Good luck!

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automatic or manual a/c.

I'm going to assume manual but Auto is simular and i can give some direction if you have that as well.

There will be a black with tan wire at the blower resistor. This is the wire the HVAC control head grounds to turn the fan on high speed. With a test light hooked to power unplug the resistor, set the blower speed to high, turn the key to the run position. the test light should turn on when you probe the connector. If it doesn't pull the control head and back probe that same wire at the back of the control head with everything still plugged in. If the test light again does not illuminate the the control head is bad and not providing ground

If the test light does turn on when you probe the blower resistor connector plug the resistor back in. Turn the blower speed to the low setting. With your test light hooked to ground see if there is power on the black with tan wire. if there is turn the HVAC off and ground that wire with a jumper wire. the fan should run at high speed. If it doesn't you have a defective resistor.

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you probly have a leaf stuck in your air box

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Well it sounds like the blower motor relay is out you might also need a blower motor if it is using to much juice on high speed then the blower motor is probabley about to go out and with the noise you are describing it sounds like a bearing in the blower motor is about to go out so probabley should change the blower motor and the blower motor relay.

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Sounds like the fan control knob has shorted out. You can check the fan "blower" relay and fuse in the engine compartment but you need to make sure the control knob is good or you will keep blowing fuses and relays. If your blower fuse and relay are good, then just have the control knob checked and replaced if needed.

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I have a 2002 nissan Maxima. The AC controls only blow on level 4. No air or heat blows from level 1-3. What do I need to do to repair this problem?

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Heater fan noise and sporatic fan control switch


Sounds like the fan is going out. Perhaps something got dropped down a vent and hitting the blades and maybe even jamming them from time to time. Paper, cigarrette, nut, bolt? Take the fan out hook the wires, red, black to battery power and see how it operates. Sometimes the bearing in the back drys up and a little spray lubricant does wonders.

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