Question about Infiniti QX4

7 Answers

Several weeks ago I started the car and the a/c blower motor did not come on. After several blocks it came on and has performed ever since. Yester day the same thing happened but did not come on and still has not come on. Please help

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  • bobfarr2 Jul 31, 2009

    I have repaced the fan amp and the cabin air filter. also lubed the fan and checked it out. Still have intermitent failure of the fan which sometimes comes on by it wself and when I hit a bump it will come on. Sounds like a loose connection. I checked the fuzes and the connections when I had the glove box out.
    Where are other connections that might be loose.

  • bobfarr2 Jul 31, 2009

    I have repaced the fan amp and the cabin air filter. also lubed the fan and checked it out. Still have intermitent failure of the fan which sometimes comes on by it wself and when I hit a bump it will come on. Sounds like a loose connection. I checked the fuzes and the connections when I had the glove box out.
    Where are other connections that might be loose.

  • bobfarr2 Aug 01, 2009

    Sorry I tought you would see the previous discussion. This is an Infinity 2000 QX4 the fan motor is behind the glove box. I replaced the blower fan ampflier and changed the cabin air filter and check and reseated several connectors in that area. I don't see any wiring on the engine side of the firewall.

    Also checked the fuze inside the cabin.

    look forward to your help.

    Bob

  • bobfarr2 Aug 02, 2009

    There is no blower motor relay in the driver side box, there is a fan rad relay on the other side. where is it?

    Bob

  • bobfarr2 Aug 02, 2009

    Found the relay. its higher that the other two so you have ot look for it. However, I went to get gas and it operated fine but after starting after fill up - no blower. So, switching two relays did not solve the problem. What other thoughts.
    Bob


  • bobfarr2 Aug 02, 2009

    After rereading your last post I take that you feel that the blower motor is bad and needs to be replaced? I have already replaced the blower amp which I believe contains the resistor.

    Bob

  • bobfarr2 Aug 03, 2009

    I am experiencing an interminent blower motor failure in the A/c blower on a 2000 Infinnity QX4. After reading extensive post on the NICO board i decided to go ahead and replace the Blower amp which I did last week end. I also replaced the in cabin air filters which really needed it and removed the blower motor itself to verify that there was nothing jamming it. I have had several failures during the week.
    I swapped the blower motor relay with another relay and had another failure today after that. Another expert tells me it is a grounding problem??? I need to get to the bottom of this.
    Bob

  • bobfarr2 Aug 03, 2009

    We actually swithched out the blower motor relay with an identical relay and still experienced a failure which would seem to indicate that it is not the blower motor relay. What do you think.

    Bob

  • bobfarr2 Aug 04, 2009

    please review previous post for this blower motor problem

  • bobfarr2 Aug 04, 2009

    Where is the air conditioner relay located??

  • bobfarr2 Aug 04, 2009

    Yes I have performed all of the suggestions. Still have the problem.

  • bobfarr2 Aug 07, 2009

    I did exactly as you said, although the Autozone people knew little about it. I bought the aircon relay and replaced it and have not had a failure in four days. I think that was it. Thanks for your help with a difficult problem.
    Bob

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The blower is controlled by an electronic device located under the dash called an air conditioiner relay. You most likely have one that is on it's last legs, which explains the sporadic action.

If you have an auto zone near by drive there and tell them you need a new A/C relay. They will generally not only sell you one but even install it. All it requires is to unplug the old one and plug in the new one.

Posted on Aug 04, 2009

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Motor brushes may be getting stuck and need to be worked loose before turning on, or it may have a relay in the wiring that is not clicking right away.

Posted on Aug 04, 2009

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Hi Bob,

Have you tried the steps outlined in this page?

http://forums.nicoclub.com/zerothread/289709

Posted on Aug 04, 2009

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  • Infiniti Master
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Many/most vehicles have a resistor in the circuit that have been known to act same as you describe. Best thing is to follow harness back from fan motor and see if you can find another connector on heater/AC duct work or on opposite side of firewall under the hood, directly or close to where heater fan would be. The most common result of a bad resistor is that blower only runs on high, but I have had some same as yours. If you give me year & model of vehicle, perhaps I can pinpoint resistor location better.

Posted on Jul 31, 2009

  • Mike Butler
    Mike Butler Jul 31, 2009

    Anybody there?

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Sounds like the fan relay has build up on the contacts or it's just going bad.should be located under the hood in the main fuse box.

Posted on Aug 03, 2009

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  • Expert
  • 179 Answers

Check your blower motor relay under the hood it sounds like it may have gone bad. just swap a different relay in it's place if it works then it is a bad relay, buy a new one and replace. if your relay is good then check your wiring to the blower motor look for power and a ground. if that checks out then your entire blower motor resistor pack is bad. hope this helps you out. if you post any other comments I will be glad to help you out.

Posted on Aug 01, 2009

  • Derrick Nichols Aug 02, 2009

    The blower motor relay is on the driver's side fuse block just above the regular fuses. there are three relays it is the center one. this is according to mitchell on demand.

  • Derrick Nichols Aug 02, 2009

    At this point a it is a wiring issue a bad ground most likely. this is causing your problem.

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  • Master
  • 8,619 Answers

Hi

If the blower motor is not working then you need to check:

1. The fuse or relay is bad
2. The switch is bad
3. The blower motor resistor is bad (located way under the dashboard)
4. The BCM (Body Control Module) is not communicating with the other computers

If still it does not work and all the above components are fine then unfortunately you’ll need to replace the blower motor itself.

Please do accept the solution if the issue is resolved or else revert for further assistance.

Thanks
Rylee

Posted on Jul 25, 2009

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