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I have a 1999 plymouth voyager that recently overheated while the ac is on. the fan relay sensor has been changed, but when I turned on the ac the fans stop working and the van overheaths. help...please whats wrong?

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  • alma_diaz May 31, 2010

    do you think this is an electrical shortage somewhere?

  • alma_diaz May 31, 2010

    thank you i will try this, will let you know. thank you.

  • alma_diaz May 31, 2010

    what i noticed is that the temperature will get high and the ac is off, the fans will not come on at all. when the fan relay sensor was changed they came on, but as soon as i turned the ac, the fans just stop working.

  • alma_diaz Jun 01, 2010

    is there another name for this part? can't find it under " high side cut out switch"

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Check the high pressure switch on the ac high side line.

Posted on May 31, 2010

  • 1 more comment 
  • Ronny Bennett Sr.
    Ronny Bennett Sr. May 31, 2010

    No,I do not,check the high side cut out switch,it controls when the cooling fans come on with the ac,and it cuts the compressor off if the compressor head pressure gets too high,change this switch before doing anything,it is the most likely problem

  • Ronny Bennett Sr.
    Ronny Bennett Sr. May 31, 2010

    With the ac off ,the cooling fans will come on,and then go off as the engine is cooled down,they will do this on there own,but the ac ,as it is turned on,the pressure switch on the high side line tells the cooling fans to come on,but may only come on when the pressure gets up on the ac high side,about 250 psi,and sometimes the switch is made for it to come on sooner.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jun 01, 2010

    ac High side pressure switch

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