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What does this ?

Discussion in '80-Series Tech' started by T Y L E R, Nov 18, 2003.

  1. T Y L E R

    T Y L E R

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    Lately I've noticed something ....

    I'll be sitting at a light . Even if the stereos on , I'll sense a loss of background noise , and simultaneously I'll feel the brake pedal drop slightly . Hell the first time this happened I immediately thought the vehicle was going to stall . Felt like I had lost engine power for an instant . It's cooler these days so I keep the defrost on ... which leads me to a question :

    When you have the defrost on , does the AC light come on ? Mine does ... unless I change to the setting to the left of full defrost . I have my temperature setting up high , so why does the AC light up ? Makes me wonder if I have a defect of some sort that is casuing the defrost to set off the AC , and that musty be the noise I'm hearing ... AC compressor ??

    • So is it AC ?
    • Is this normal ?
    • Why does my brake pedal drop ? ( when the comp. goes off ?)

    Tyler
     
  2. alaskacruiser

    alaskacruiser

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    The AC coming on w/ defrost is normal- it helps to better defrost the windshield. Not sure on the brakes- haven't noticed that.
     
  3. sjcruiser

    sjcruiser

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    Tyler,

    AC is supposed to be on with front windshield defrost - it dehumidifies inside air.

    I too have noticed a drop in the brake pedal at stoplights as well (not limited to my cruiser). I had thought it has air in the brake lines; but in that case the pedal travel would be in reverse direction. Really appreciate if someone could explain the rationals behind this though.

    Regards,
    Frank.
     
  4. DanKunz

    DanKunz SILVER Star

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    increased idle with AC on at a stop would increase vacuum on the booster....causing pedal to drop.

    If your booster blows out...your pedal goes WAY down =)