I've got a 2011 Expedition with 80,000 miles. All stock. There's a faint whistling sound only after I turn the engine off and it's hard to pinpoint where it's coming from-under the hood or under the middle of the truck. The kicker is that the sound can last up to 3-4 hours after I turn the engine off-even if I disconnect the battery! Dealer says everything is fine and no codes. Please help! This is driving me nuts and I don't want to sell my problem to someone else.
2011 Expedition Whistling Sound
- Thread starter Gwen01
- Start date
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Coolant levels are good and no engine temp problem-even after driving in 122 degree heat with the ACs blowing on high for hours! There's also no leaks under the hood and nothing on the ground.
It's been going on for about a year and has had more than a few dealer oil changes with no mention of any problems. Dealer also couldn't identify the sound and truthfully, it's really hard to hear in a mechanic shop. But I can hear it clearly in my garage at home.
It does sound like a steam kettle after you shut it off and it gurgles, but it lasts for 3-4 hours at the same sound level, never getting louder or softer! It just magically quits at all once.
My neighbor was a diesel mechanic and thought maybe AC compressor, but no AC problems and the sound occurs even in the winter, when I have the AC and heat completely off.
It's been going on for about a year and has had more than a few dealer oil changes with no mention of any problems. Dealer also couldn't identify the sound and truthfully, it's really hard to hear in a mechanic shop. But I can hear it clearly in my garage at home.
It does sound like a steam kettle after you shut it off and it gurgles, but it lasts for 3-4 hours at the same sound level, never getting louder or softer! It just magically quits at all once.
My neighbor was a diesel mechanic and thought maybe AC compressor, but no AC problems and the sound occurs even in the winter, when I have the AC and heat completely off.
JExpedition07
That One Member
Does it sound like a sizzle every few seconds like water steaming off something?
JExpedition07
That One Member
next time you shut it off open the gas cap and see if it stops, another important question do you have air suspension??
JExpedition07
That One Member
Explorers have had issues with transmission solonoids staying on and whining for hours after shut down as well. None of these are “big deal” issues but are annoying.
JExpedition07
That One Member
Almost sounds like the explorer issue how you describe you can hear it near the tranny pan. Might be a solonoid staying on or electric gremlin in that area.
So I just crawled under and looked at the transmission pan to see if the modulator valve is external or not and I noticed transmission fluid stains on the front and back of the transmission pan going out from the pan, but not on the sides. There was even a drop of transmission fluid on the pan. That could be the source of the whistling sound as it cools! I hope it's just a change of the transmission fluid, new filter, and new gasket. Never saw the modulator valve, but at $23 a pop, I'll change it, too.
deweysmith
Full Access Members
Dang. I thought for sure… my air suspension makes noise for hours sometimes.
Jay Echstenkamper
Member
Check all the door and window seals I had the back hatch seal come apart at the seam. A little RTV and good as new!
Paul Prekeris
Member
There is a vacuum canister on firewall to activate 4 wheel drive front lock hubs. You may have a slight vacuum line leak from one of the lines or the canister
So I had transmission flushed at a reputable transmission shop and they also installed a new Ford modulator valve, but the problem still exists. I now think it's related to the A/C system. Its been really nice out and I haven't had to run the A/C, heat or even the fan and guess what...no whistling! I've even done some big trips up a mountain and back this way and still no whistling. That was encouraging. But for giggles, I ran the AC tonight for a quick trip, even though it's 60 out and viola, Fred (my Expedition) was whistling a storm, but only after the engine was off for 15 minutes. Thoughts?
deweysmith
Full Access Members
Sounds like normal operation to me. The expansion valve will let the pressure bleed off in the evaporator side (I think) and the system will equalize once the compressor is no longer operating. Mine makes this sound too but it's pretty quiet and it's never bugged me.
You could get it checked to make sure you've got enough refrigerant still, and as long as you do I wouldn't worry about a thing.
You could get it checked to make sure you've got enough refrigerant still, and as long as you do I wouldn't worry about a thing.
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