Question about 2000 Ford Expedition

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Sound under dash

Hissing sound air lick

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  • 173 Answers

Check your vacuum lines for the heater and check your power
booster if don't leak

Posted on May 07, 2013

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Posted on Jan 02, 2017

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SOURCE: 2005 Ford Escape Hissing sound

The power brake booster has a bad valve. I can't suggest where to find a new valve for it, but you can buy a rebuilt replacement. They are usually not hard to put on.

Posted on Jul 02, 2009

matney68
  • 426 Answers

SOURCE: 1996 ford ranger air hissing noise coming from

This could actually be a vacuum leak since your climate controls are vacuum controlled. Listen to seeif it sounds like it is coming from the center of the dash area around the control or further to the right. sound can play tricks on you but this would most likely cause unless you only hear it when the blower is on. Then it would be a leak in the blower area.

Posted on Nov 12, 2009

  • 7353 Answers

SOURCE: Hissing sound from under the driver's side of

Could be the brake booster.

Posted on Nov 23, 2009

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1996 Buick Park Avenue Ultra making a hissing noise when I press Brake Pedal. Have to Press super hard to stop or slow down.


Sounds like a possible air pocket in the braking system. Do you know how the bleed the brakes? They may need to be bled. Also, if you've added brake fluid recently, and didn't put the cap back on, it could create a suction. Another note is to check the cap to the brake fluid reservoir. It's rare, but, it could be bad.

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Hi Shelly, Your explanation is a little short on detail. I suggest that you take a length of plastic tubing and while the engine is running, and the hissing sound is evident, place one side of the tube to your ear move the other end to the different units fitted under the dash until the noise is loudest. Once you've done that you can identify where the defective joint or unit is. Regards John

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My air condishing quit working. It appears that the freon leaked out. You could hear a hissing sound under the dash. Is there something that can come lose under there and how do you get to it. It is a 2000...


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I have a 2003 eddie bauer ford expedition, when im driving, i can hear a sound like air coming from a tire under the dash on the drivers side floor area. when i tap on my break the sound goes away, what...


A vacuum leak. Look & listen for hissing noise where rubber or nylon lines come through firewall under dash near brake pedal. Also look under hood at large hose going to back of brake master cylinder, power brake booster.

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1998 caddy catera rides really hard levellig light fashing on dash can hear a hissing sound from under the car is there a compressor [air] for the shocks any help great


Yes there is a compressor for the level ride.If the light is on or flashing it means there is a diagnostic code or codes in the system.But if you are hearing a hissing noise then look under the vehicle and locate the air leak.You probably have a line that rubbed through somewhere.You might be able to get a repair kit to repair the leak at a auto part store.Hope this helps.Good luck.

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2 Answers

Hissing sound from under the driver's side of


Yes sound like brake booster. most of time when booster is going bad makes hissing sound when brake applied.But should not make any kind of air leakage noise at all.Replace brake booster.Hope this was helpful for you.

Nov 23, 2009 | 2003 Ford Expedition

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