Question about 1997 Buick LeSabre

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1993 Buick Lesabre Limited A/C problem

Typical issue, or so I thought. Automatic Climate control, Blower motor starting blowing at high speed only and continued running when car was shut off. Resistor issue of course. I replaced the Blower motor control module with Advance part# RU1004. Full control of blower was restored, but the A/C compressor does not engage. System is fully charged and was working perfectly prior to blower issue. Fuses are all good. I have not checked to see if there is voltage to the compressor, my guess is no since it's not running. What am I missing here, could there be a relay that is out, does the power module do more than power the blower. Module I replaced was Delco part# 16173860

Appreciate some direction,
Robert

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  • renecks Jun 30, 2009

    Ah simplest things first, I disconnected the negative battery
    terminal for 20+ seconds and the compressor still did not engage.
    I ran through the control setting, defrost - heat - econ etc. Back to
    auto and ran the temp setting up and down, nothing happening there but
    blowing air which is what I set out to repair and successfully sorta.
    I'll probably replace the low side switch tomorrow after work and see
    if that results in any change. Thanks for the advice but keep
    those gears turning.



    Much Appreciative,

    Robert



  • renecks Jun 30, 2009

    Thanks roniecon for your suggestion. I corrected the issue after work today. Cooling like a champ.

    Thanks

  • sylvia ervin Aug 14, 2013

    Robert, what is the low side switch? Sylvia

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  • Buick Master
  • 6,826 Answers

Disconect the negative battery cable from battery for 20 seconds and replace cable back,then try ac let me know if this helps u

Posted on Jun 30, 2009

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