Question about 2002 Nissan Altima

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My 03 Altima 2.5S AC compressor wont engage, I took it to an AC shop and he told me he checked the pressure and everything is ok... no leaks. the compressor is not getting any power as well as the radiator fans. I tryed buying a computer from a junked car, connected it and still no power. all controls and blowers work fine.... what is the problem???

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  • mannyqui May 27, 2010

    The ac mechanic said he checked the relays and they where good.... any other ideas? someone???

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  • Master
  • 1,902 Answers

Check the relays, the relays could cause you this issue, if the compressor is not getting any issues then that is a power supply problem that he should have been able to diagnosis when he was looking at the AC unit. Your relay will be under the hood in your fuse box, you may have to look at the manual or the back of the fuse box cover to figure out which one controls the fan and AC. It will be a bigger relay

Posted on May 27, 2010

  • mannyqui May 27, 2010

    He said he checked the relays and they where fine but what should I look for?
    There is no info on which relay controls the ac on the manual or on the cover
    is there a way to check if the relay is burend out? If so how? Do I remove and shake it? I. E. Clueless...

  • Jeremy Reddick
    Jeremy Reddick May 28, 2010

    Here is where the AC relay is located for your vehicle: The A/C relay is in the IPDM (that black box next to the coolant tank).

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  • Master
  • 1,297 Answers

A lot depends on weather you have automatic A/C or manual but I am suspected a volt drop across the compressor clutch circuit

please update post when you get a chance
Sean

Posted on May 27, 2010

  • 1 more comment 
  • mannyqui May 28, 2010

    took it to the dealer today, costing me 350.00 to put in a new pressure switch or sensor. according to the dealer it was burnt out. anyone knows where the pressure switch or sensor is on this model? would definitely like to take a look just to make sure they replaced it and to know where it is in case it happens again.


  • Sean Reisdorf
    Sean Reisdorf May 28, 2010

    I'd still like to know weather you have the Automatic or Manual a/c System

    depending on which unit you have could depend on location of "switch/sensor" but I suspect it is the thermo-control amp behind the right side of the dash

    regardless...it is you LEGAL right to ask the dealer to show you the location of the part they replaced and to provide you with the old part

    when you get the old part take a picture so I can ID the part and teach you how to test it of later reference


    Sean


  • mannyqui May 29, 2010

    I wish I would have checked my email sooner, I picked the car up yesterday, didn't get a chance to ask for the part or the location.... wanna hear something weird.... the trunk opening switch at on the door now doesn't work... I checked all the fuses, the switch next to the glove compartment is on.... do you think they disconnected something while working on the sensor? should I take it back?

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1 Answer

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Ac compressor will not engage when ac is on. System seems to be full of gas. Quit without warning. This is on a 2003 Nissan Altima with 2.5L. Secondary fan does come on when AC is switched on.


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