ervwalter Posted April 11, 2011 Report Share Posted April 11, 2011 When I press my foot on the brake pedal and before I press the "start" button, a high pitch tone starts from under the hood of my 2011 MKX (premium/elite package if that matters). It sounds electronic (i.e. not something mechanical rubbing on something else). It isn't especially loud. Although the vehicle drives fine and there are no other symptoms, I wondered if it was a symptom of something that was wrong or failing. As far as I can tell, the tone doesn't stop when the engine starts, but it is much harder to hear over the engine noise. I don't know if it stops at some point after the engine has been running for a while. The technician at the dealer obviously had never heard of it before but said he didn't think it was abnormal. Given that he wasn't ware of it as a normal behavior prior to me asking about it, I am not sure how he came to the conclusion that it was not abnormal. Does anyone know if this is a normal behavior and just indicates that something is getting energized/primed prior to me starting the engine? Quote Link to comment Share on other sites More sharing options...
richy Posted April 11, 2011 Report Share Posted April 11, 2011 I haven't noticed it on my MKX, but to be honest, I usually just push the button right away. I'll listen for it after work today. Quote Link to comment Share on other sites More sharing options...
john747 Posted April 11, 2011 Report Share Posted April 11, 2011 I have noticed this as well especially when it is sittting in the garage in accessory mode. It does go away after a few minutes. I believe others have made note of this and it seems to be normal. Quote Link to comment Share on other sites More sharing options...
spongers Posted April 11, 2011 Report Share Posted April 11, 2011 I have noticed this as well especially when it is sittting in the garage in accessory mode. It does go away after a few minutes. I believe others have made note of this and it seems to be normal. My 2011 Edge SEL without push button start does this as well in accessory mode. I wondered if it is a fan somewhere for the electronics. To me it sounds like a high pitched computer fan, of which I am very familiar as I work in the IT business. Could be wrong of course. Quote Link to comment Share on other sites More sharing options...
Edgieguy Posted April 12, 2011 Report Share Posted April 12, 2011 I can hear it on our Sport when I turn the motor off at night. Its a high pitch whistling. Its only noticeable to me night when its very quiet. Quote Link to comment Share on other sites More sharing options...
cal3thousand Posted April 12, 2011 Report Share Posted April 12, 2011 My 2011 Edge SEL without push button start does this as well in accessory mode. I wondered if it is a fan somewhere for the electronics. To me it sounds like a high pitched computer fan, of which I am very familiar as I work in the IT business. Could be wrong of course. It could be anything from a Fuel Pump priming to some relay that gets energized. Could be the little hamster that powers the MFT system, who knows? 1 Quote Link to comment Share on other sites More sharing options...
ervwalter Posted April 15, 2011 Author Report Share Posted April 15, 2011 Thanks all. Glad to know that it is a typical occurance and not something happening to just me. Quote Link to comment Share on other sites More sharing options...
ddd269 Posted April 15, 2011 Report Share Posted April 15, 2011 It's unrelated but... When high beam is activated during day time or when the headlight comes on, there's a mechanical clunking noise under the hood. Any idea what this is? Sounds too loud to be a relay. Quote Link to comment Share on other sites More sharing options...
mv-clear Posted April 17, 2011 Report Share Posted April 17, 2011 It's unrelated but... When high beam is activated during day time or when the headlight comes on, there's a mechanical clunking noise under the hood. Any idea what this is? Sounds too loud to be a relay. From what I heard its a mechanical flap moving outta the way allowing more light out of the projector housings. M. Quote Link to comment Share on other sites More sharing options...
sphinx805 Posted August 13, 2011 Report Share Posted August 13, 2011 (edited) Thanks all. Glad to know that it is a typical occurance and not something happening to just me. I noticed this on my Edge when first got it. just an annoying high pitch ringing. i was assuming something like what cal3thousand said. It's unrelated but... When high beam is activated during day time or when the headlight comes on, there's a mechanical clunking noise under the hood. Any idea what this is? Sounds too loud to be a relay. the 2011 edge doesnt have high beams. the "high beams" are merely just a flap system that cuts off the top of the beam Edited August 13, 2011 by sphinx805 Quote Link to comment Share on other sites More sharing options...
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