Question about 2003 GMC Envoy Xl

1 Answer

Rpm goes up and down when fan turned on

I have a 2004 envoy and when i turn my fan on the rpm goes down and engine has stalled. i disconnected the blower and it still happens. i changed the control module located behind the blower and it still happens. any ideas what else to check?

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  • mike_gurman Oct 06, 2009

    the alternator is working fine. still dont have a solution to my problem.

  • mike_gurman Oct 06, 2009

    to me that looks like the same response.

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  • GMC Master
  • 6,826 Answers

Sounds like the alternater.It is not putting out enough out put.Check with a volt meter conneted to the battery.It should read about 13.75 to 14.25.My guess it is only puting out about 12.5 to 13 volts.Check the battery terminals for a good connection.Be sure the cable ends are shiney and the battery contacts are shiney also.Warning,some new vehicles will loose computer memory when disconnecting the battery,so have some kind of 12 volts to plug into the cig. lighter(if the cig lighter works with key off).This will keep computer memery in tact.After you have done this make sure the alternator has the out put of 13.75 to 14.25 volts while engine is running.With key off,it should read at the battery at least,12.25 to 12.5 volts.If the alternater is not puting out these volts,then replace it.The vehicle can not operate with low voltage,and if you turn something on,such as the blower motor,or ac,or head lights,they draw a lot of amps.This will make the engine stall.I hope this was some help.Let me know if it was.

Posted on Oct 06, 2009

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Oct 06, 2009

    Sounds like the alternater.It is not putting out enough out put.Check with a volt meter conneted to the battery.It should read about 13.75 to 14.25.My guess it is only puting out about 12.5 to 13 volts.Check the battery terminals for a good connection.Be sure the cable ends are shiney and the battery contacts are shiney also.Warning,some new vehicles will loose computer memory when disconnecting the battery,so have some kind of 12 volts to plug into the cig. lighter(if the cig lighter works with key off).This will keep computer memery in tact.After you have done this make sure the alternator has the out put of 13.75 to 14.25 volts while engine is running.With key off,it should read at the battery at least,12.25 to 12.5 volts.If the alternater is not puting out these volts,then replace it.The vehicle can not operate with low voltage,and if you turn something on,such as the blower motor,or ac,or head lights,they draw a lot of amps.This will make the engine stall.I hope this was some help.Let me know

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