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hissing sound

Joined
December 27, 2012
Messages
12
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0
City, State
Menasha, WI
Year, Model & Trim Level
2007 Explorer XLT
Started hearing a hiss/"shhh" sound coming from what sounded like the passenger side everytime I pushed the accelerator with light to medium pressure today. The more I press on the pedal, the louder it became until enough pressure was applied and the sound went away. It is loud enough to hear over talk radio but I could not hear it with music playing. My explorer is a 2007 XLT with just over 80,000 miles.
 
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Ornery

Well-Known Member
Joined
October 7, 2012
Messages
423
Reaction score
3
City, State
Northeast Ohio
Year, Model & Trim Level
2006 Explorer EB V8 4WD
I'm going to guess it's a vacuum leak in the climate control. Try changing the settings on the heater and A/C to see if it goes away. Might help track down the location a little bit. In the end, somebody will have to sift through the plumbing behind the dash.
 
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The Scott

Member
Joined
July 16, 2012
Messages
25
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0
City, State
Cincinnati
Year, Model & Trim Level
2008 Explorer XLT
Search it and you should find info and the PN you need. There is a plastic diaphragm near the passenger side firewall in the engine bay that you swap out. The part from ford is about $7 if I remember correctly. I had to do this a few months back.
 
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Old As Dirt

Well-Known Member
Joined
February 14, 2006
Messages
114
Reaction score
4
City, State
ROANOKE
Year, Model & Trim Level
17 XLT
When my 2007 XLT started hissing, I dropped the glove compartment (press in the sides and let it swing down) and found multiple vacuum lines in the top left of the area that was exposed. While none of them looked like they were about to fall off their connectors, I twisted and tightened them all. While I did not feel that I had changed anything, the hissing stopped and has not started back after 3-4 months.
 
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rusty813

Well-Known Member
Joined
September 1, 2009
Messages
570
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City, State
Private
Year, Model & Trim Level
2018 Ford Explorer Sport
i have this problem as well...if someone can post a picture of where its located, that would be cool

thanks,
rusty813
 
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Ornery

Well-Known Member
Joined
October 7, 2012
Messages
423
Reaction score
3
City, State
Northeast Ohio
Year, Model & Trim Level
2006 Explorer EB V8 4WD
19A563_Vacuum_Check_Valve.jpg


I'm assuming you hear the hissing from resonance in the reservoir behind the glove box:

19A566_Vacuum_Reservoir.jpg


That, or there's actually a leak in the reservoir, or nearby vacuum lines or connections.
 
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Joined
December 27, 2012
Messages
12
Reaction score
0
City, State
Menasha, WI
Year, Model & Trim Level
2007 Explorer XLT
Thanks! $14.00 for the part, 3 minutes to locate and change, and all is well. The pics were especially helpful in locating it. I appreciate the help!
 
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