Question about 2003 Lincoln Navigator

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Knocking in rear right panel

I am hearing a knocking sound coming from my rear right panel....The radio and ac are off and it still makes a constant knock, knock sound....has anyone else had this problem??

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  • mgrbronk Dec 17, 2008

    I have this same problem but it is on the left side, it gets louder when I turn the rear air on. Did you figure out how to fix this problem

  • Anonymous Mar 17, 2014

    I have a 2003 deville knocks at idle when u drive knock goes way down you almost cant hear it sounds like knocking is coming from left side

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Yes the dealership had to replace a regulator 200+ part of ventilation system. i thought a small animal was trapped. i hope this info helps but i was told it doesnt hurt the system, so its not required to immediately fix.

Posted on Aug 05, 2008

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When i turn on heat or ac on face i hear a knocking noise coming from behind dash


If it doesn't turn to the Face/dash. Then you have some work ahead of you. The motor is turning(causing the knock sound) but the door in the plenum isn't. The gear is what's causing the noise. But I could be wrong. Older cars don't have this. Year make and model please.

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I have a 1990 Celica, trying to put in new radio. Got everything wired up correctly, Constant - blue/yellow, acc - gray, ground - brown and it won't come on. Radio fuse (top center 15 amp) is good,...


You have it right. Use a 12 volt test light to see if there is power between the gray and brown wires when the key is on. If there is power there, you may have got hold of a bad radio.


1990 Toyota Celica Car Stereo Radio Wiring Diagram
Radio Constant 12V+ Wire: Blue/Yellow, connects to yellow
Radio Switched 12V+ Wire: Gray, connects to red
Radio Ground Wire: Brown, connects to black
Radio Illumination Wire: Green, do not use
Radio Dimmer Wire: N/A
Radio Power Antenna Trigger Wire: Black/Red
Radio Amplifier Turn On Trigger Wire: N/A
Front Speakers Size: 4? Speakersir?t=modilife-20&l=as2&o=1&a=b00009uhre
Front Speakers Location: Dash
Left Front Speaker Wire (+): Pink
Left Front Speaker Wire (-): Purple
Right Front Speaker Wire (+): Light Green
Right Front Speaker Wire (-): Blue
Rear Speakers Size: 5 1/4? Speakersir?t=modilife-20&l=as2&o=1&a=b00009uhre
Rear Speakers Location: Side Panels
Left Rear Speaker Wire (+): Black
Left Rear Speaker Wire (-): Yellow
Right Rear Speaker Wire (+): Red
Right Rear Speaker Wire (-): White

Oct 29, 2011 | 1990 Toyota Celica

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I have a honda civic 2d 1997 i hear a knocking sound when i turn to the left or right


the strut shocks will make this sound if the upper bearings are bad

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Heater/AC vent option knob produces knocking sound in back right corner. i.e. the knob rotates from vents in front to half front half floor to all floor to half floor half defrost to all defrost. the...


If I am reading correctly you are hearing the vent doors moving to redirect the airflow to the vents you choose. This is normal and can be more noticeable if the blower fan is on, putting air pressure against the doors.

Jan 09, 2010 | 2003 Chevrolet TrailBlazer

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Car started noise like nock ing that was from Clutch in AC copmressor


It could be the compressor is going out, or the clutch itself is worn out. If the AC still gets cold, then it is the clutch.

Nov 14, 2009 | 2005 Mercedes-Benz Mercedes Benz E320 Cdi

1 Answer

Knocking in the rear panel


If the vehicle is on, but not moving, the only thing in that area that would be "in motion" and capable of causing a 'knock' is the electric fuel pump. That should be your problem. The only other possible cause would be if you have some sort of electric/computer controlled ride system which is trying to pump up and is making a knocking sound. There is nothing else in that area of the vehicle that can cause that when you are parked.

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I'm getting this knocking sound in the front passenger side of my


This is a symptom of a failing constant velocity joint. This is the "universal" joint on the front driveshaft which couples to the wheels and is usually covered with a flexible rubber boot. You may find the boot is cracked or torn allowing grit and water to get into the mechanism causing it to fail.

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1991 honda accord radio wires cut need schematic


Radio Constant 12V+: Blue/White
Radio Switched 12V+: Yellow/Red
Radio Ground: Black
Radio Illumination: Red/Black
Radio Dimmer: n/a
Radio Antenna: Driver’s Pillar
Front Speakers Size and Locations: 5 1/4′ Doors
Left Front (+): Blue/Green
Left Front (-): Gray/Black
Right Front (+): Red/Green
Right Front (-): Brown/Black
Rear Speakers Size and Locations: 6 1/2′ Side Panels
Left Rear (+): Blue/Yellow
Left Rear (-): Gray/White
Right Rear (+): Red/Yellow
Right Rear (-): Brown/White

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I need the wiring diagram for the radio on a 1994 nissian quest gxe


Constant 12V+ Brown/White
Switched 12V+ Orange
Ground Black/Light Green
Illumination Pink/Black
Dimmer Pink
Front Speakers 5" x 7" Doors
Left Front (+) Gray/Blue
Left Front (-) Yellow/Blue
Right Front (+) Blue
Right Front (-) Yellow
Rear Speakers 5" x 7" Side Panels

Left Rear (+) Blue/White
Left Rear (-) Blue/White
Right Rear (+) Blue/Black
Right Rear (-) Red/Blue

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Cut harness from stereo in 1990 corolla dx sedan


did u know that they make a harness for your car that plugs into your factory harness and then adapts to your aftermarket radio? for the lights, you have blown the interior light fuse, it may be the same fuse as the cigar lighter.Below is your radio wire colors and what they do.
1990 Toyota Corolla Car Stereo Radio Wiring Diagram.
Radio Constant 12V+ Wire: Blue/Yellow
Radio Switched 12V+ Wire: Gray
Radio Ground Wire: Brown
Radio Illumination Wire: Green
Radio Dimmer Wire: N/A
Radio Antenna Trigger Wire: N/A
Radio Amp Trigger Wire: N/A
Front Speakers Size: 4′
Front Speakers Location: Dash
Left Front Speaker Wire (+): Pink
Left Front Speaker Wire (-): Purple
Right Front Speaker Wire (+): Purple
Right Front Speaker Wire (-): Light Green
Rear Speakers Size: 4′
Rear Speakers Location: Rear Deck
Left Rear Speaker Wire (+): Black
Left Rear Speaker Wire (-): Yellow
Right Rear Speaker Wire (+): Red
Right Rear Speaker Wire (-): White
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Dec 19, 2008 | 1990 Toyota Corolla

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