High pitched whine coming from somewhere near the firewall of my 1997 escort wagon. | Ford Escort Owners Association (FEOA)

High pitched whine coming from somewhere near the firewall of my 1997 escort wagon.

Discussion in 'Tech & Repair' started by MelsiesLittleWagon, Aug 17, 2019.

  1. MelsiesLittleWagon

    MelsiesLittleWagon New Member

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    There's a high-pitched whine coming from the firewall area of my 1997 Escort. It doesn't seem to change in volume or rpm. It does seem to change when a turn signal is turned on?? What is making this noise and how do I make it stop??
  2. denisond3

    denisond3 Moderator Staff Member

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    When does it do it; only when the engine is running, or anytime the ignition is on - even if the engine is stopped? Does it do it with the engine shut off and the ignition shut off. Is it related to the radio or CD player being on?
    And does the car have a -speed transmission or the automatic transmission?
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  3. pextor

    pextor Moderator Staff Member

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    Sounds like a vacuum leak possibly.
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  4. denisond3

    denisond3 Moderator Staff Member

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    True; as the heater controls use vacuum for something, starting in 95 I think.
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  5. zzyzzx

    zzyzzx FEOA Member

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    I am also thinking HVAC related
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  6. MelsiesLittleWagon

    MelsiesLittleWagon New Member

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  7. MelsiesLittleWagon

    MelsiesLittleWagon New Member

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    As far as I can tell...it only whines when it's running! There is a problem with the cold/hot temperature knob in that it can be turned 360 degrees with very little change. It's in the cold position right now. It's also 85 degrees here!! We've just acquired this vehicle from a used car dealer and we're sorting through its issues. The car only has 33,00 miles on it! It was used as a campus car so never driven much and clearly has only had someone in the driver's seat! The compressor does seem to kick on and off more frequently than other cars we've had! The compressor also seems to kick in even when just the fan is turned on!! Is this part of the operation of the HVAC?? It's an automatic transmission.
  8. zzyzzx

    zzyzzx FEOA Member

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    My Escort is older, and uses a cable and vacuum to do HVAC things. You need to find out if yours uses a motor and some crappy plastic gears. For all I know, you have stripped plastic gears and are hearing a HVAC motor spinning.
  9. denisond3

    denisond3 Moderator Staff Member

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    If the a.c. compressor cycles on and off - its a sign the refrigerant is a bit low, or that your air temps are fairly low. If its above 85 degrees, would thin the compressor would stay on all the time. If not, mght be time to check the pressure in the 'low' freon line.
  10. rbailin

    rbailin FEOA Member

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    On this car, the A/C compressor runs in all positions except Vent, Off and Heat.

    The temp control knob should not turn 360 degrees. Even if the cable is disconnected, it should only turn from full cold to full hot position. Check the cable to see if it's properly clipped to the temp control door. It's the large cable about 6 inches to the right and up from the gas pedal. If it's disconnected, check that the door hinge sticking out towards you travels only from the 10 o'clock position (cold) to the 2 o'clock position (hot). Move it to the full cold position, turn the control to the full cold position, and press the end onto the hinge until the plastic tab clicks to lock it in place.

    The temp control cable must be unclipped before you can remove the radio/HVAC header. If someone forgot to do this, the other end of the cable rips away from the temp control on the header. It can usually be snapped back into place after removing the header.

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