Question about 2000 Chevrolet Impala

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MAKING A KNOCKING NOISE ON RIGHT SIDE BLOWER DOOR,DOOR THAT OPEN AND CLOSE WHEN A/C AND HEATING CONTROL IS TUN OFF. I OPEN GLOVE COMPAMENT DOOR AND KNOCKING AMD VIBRATION COME FROM PART (attached to right side of assemble that open and close . when contol is turn off, the knocking will continue about twenty to thirty seconds.

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The actuators for the vent dampers are faulty. I just had to replace 2 of them at the dealer ($300).

Posted on Jan 08, 2013

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Its the re circulate flap and the problem is the trampilia ,forgotton name in english for the operating device ,havent a clue how to get to it to change it though ,its a vacumn operated piston and i bet its a dash out job to get to it

Posted on Oct 24, 2010

  • c mo
    c mo Aug 17, 2014

    Dealer says the one actuator that hasn't failed is gonna be $950. If you're having actuator problems on your Impala please submit an FTC report. Takes about 5 minutes at



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I have a 1994 Chevy Silverado and every time I turn on the ignition, the knocking noise begins from under the dash somewhere. If I remove the fuse to the a/c/heater it doesn't make a sound when I

Try starting the truck so it makes the noise.
Then switch the air control to "fresh".
If noise stops, it is probably the motor that closes flap to recycle the cab air.
It would be found under the dash, under the glove box, & would need to be replaced.

Sep 20, 2012 | Cars & Trucks

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Knocking noise coming from underneath passenger side dash when starting and turning off vehicle. what causes that?

There are two motor controlled doors that control air flow for your heating/cooling system. These doors are located in the A/C ductwork under the right side of the dash. When you turn off the ignition, the doors close through the action of the small electric motor and gears is an attached control box. The knocking sound that you hear is a gear slipping in the control box as the control motor continues to run after the air door has been closed. I have no idea why the door motor continues to run. The solution for me with my 94 burb was to disconnect the electrical lead to the control box. If you have lots of patience and very small hands you may be able to replace the offending module. However the root cause seems to be the door motor continuing to run.

Jul 23, 2012 | 1994 Chevrolet Suburban

2 Answers


Its must be your a/c recirculation door motor its located near the right side of the glove box. open your glove box next time it clicks. its in a tough spot to remove but it can be done. you can buy them aftermarket for about $25.00

May 02, 2011 | 2008 Chevrolet Impala

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2005 pontiac vibe just started making like & popping noise on the passenger side behind the glove box under the dash and the noise stops when the car is off. No heat or air was on

you have a bad actuator motor or a broken blend door in the heater box, the noise you hear is the skipping of the gears in the actuator motor, the ehating system along with ac use motors to move doors inside the heater box, the doors control the flow of the air and the temp, you will need to locate the bad one by unplugging one at a time, when noise stops you have the right one, remove it by removing screws that hold it to box. with motor removed look at the hole that controls the door, you will see a small square that the motor turns ,this id part of the door hinge, you should be able to turn side to side, this swings door left and right like a rood door, open or closed, if the door swings good then the actuator is bad, let me get a picture to help you located it, you will located the heater box in the location of the noise, behind glove box, try to acess from the bottom of the dash and also remove glovebox,hope this helps, good dayjohnjohn2_96.jpg

Apr 13, 2011 | 2005 Pontiac Vibe

1 Answer

I have a 2009 Dodge Ram that has a loud knocking noise that comes from the blower (under dash passenger side). It starts 6 seconds after I turn the key and lasts for 9 seconds. If I put my hand on the...

sounds like u have an electric mode door motor,in ur hvac housing stripped . move the mode selector to different positions to amplify noise an sort of control noise. u have a blend air door motor, mode position motor, for example inside air an outside air recirculating door motor, or defroster mode motor or actuate the heater position an u should b able to control noise by changing modes, thats wen u know u found it wen u can make the noise come an go. also one of ur selector positions is obviously not workin due to a stripped motor or broken blend door. good luck

Apr 09, 2011 | Dodge Ram 1500 Cars & Trucks

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1983 ford ranger 2.2 engine-no heat,full of anti-freeze,replaced thermostat 195 degrees,found a bunch of gunk in heater control valve box?under carb ,heater core doesnt seem to be blocked,took most of dash...

im not sure how to remedy the heat problem, make sure the heater core is actually hooked up as many people simply run a bypass. I do know that you need to return the vacuum items because if there is a cable that means it is not vacuum actuated. the gunk may well be radiator or headgasket sealant which unfortunatly causes blockages and buildup in heater cores. i would suggest giving closer inspection to the heater core because everything else you have done is spot on. good luck

Dec 28, 2010 | 1983 Ford Ranger

1 Answer

Blower work fine but still dont get no heat or defrosters could use some help thank you

It sounds like your heater controls are not working. They are usually operated by a vacume line. check under dash passenger side behind glove box for the vacume line disconected ps check engine side first its easier. if vacume line is good chech vacum at heater box their is a meatel vacume unit that opens and closes the heat and defrost doors. if your heat is only comeing out of the defrosters The doors under the dash are not opening and closeing. ChecK the metal vacume unit . A vacume pump can be purshed at parts store some have a loner program.

Nov 26, 2010 | Chevrolet Beretta Cars & Trucks

1 Answer

I have to change the heater blower moter switch how do I do that

SECTION 412-02: Heating and Ventilation 2000 Focus Workshop Manual REMOVAL AND INSTALLATION Procedure revision date: 10/6/2003 Blower Motor Removal
All vehicles
  1. Remove the footwell lower trim panel.
  1. Open the glove compartment.
  1. Remove the footwell vent air duct.
    • Pull off the hose.
  1. Close the glove compartment.
Vehicles with electronic automatic temperature control (EATC) built 11/2003 onwards
  1. Disconnect the blower motor control module electrical connector.
All vehicles
  1. Disconnect the blower motor electrical connector.
  1. Remove the blower motor.
NOTE: Procedure if there is a concern over whistling noises from the heating system.
  1. NOTE: Set the air distribution switch to ""Head area” and the temperature control switch to ""MAX cooling”.
    Remove the ventilation center nozzle and open the glove compartment.
  1. Unclip the passenger side defrost nozzle air duct and position it on the open glove compartment cover.
  1. NOTE: Do not allow any parts of the joining tang to pass behind the instrument panel.
    Remove the two-part plastic joining tang on the heater housing.
    • Cut the joining tang at the top end using side cutters, break it off at the bottom and discard it.
  1. Cut the sealing tape into a 50x50 mm square.
  1. ani_caut.gif WARNING: Sharp edges on the heater housing.
    Feel for the gap in the heater housing, affix the sealing tape over the gap from the inside and press it firmly in place.
    1. NOTE: Apply the sealing tape in the position shown. The sealing tape must not be applied higher than the position shown in the illustration.
      Heater housing (shown in cross section)
    1. Sealing tape
  1. To install, reverse the removal procedure.


Apr 04, 2010 | 2000 Ford Focus

2 Answers

I have a 1993 chevy silverado when you start and shut off truck makes a knocking noise from glove box area lasts 30 seconds or so also does it with a/c and heater controls

probaly the temp door actuator motor plastic gears break or theres somthing in the way of the door anything fall down the deforster vent lately.

Mar 20, 2010 | 1993 Chevrolet C1500

2 Answers

Heat coming from passanger side when climate control system on

There are,what they call vent door actuator motors that open,and close the vents on each side these go bad time to time.If the glove box is getting hot,the heater control valve could be another problem also.First thing to try is,behind the glove box is a vacuum junction with a threaded stud(very small).There is a nut that holds the vacuum plug to the junction.It is on the stud.Unscrew it(it is time consuming).Then gentley,remove the plug.There will be little **** that align with the vacuum plug that could come apart,so be carefull.Use a silicone spray,and nothing else,and spray in the junction,and the plug real good,and replace the vacuum plug back as soon as you can.Do this as the ac is on and engine is running,so it will **** the lubrication in where it is needed.If it is a vacuum switch is stuck,this will make it start working again.Then ,if everything (vents and cool air)starts working,check the heater control valve to see if it is opening,and closing.The heater control valve closes off the hot water from entering the heater core,therefore,keeping the temp,in the air box from heating up.If I can help,let me know.

Sep 23, 2009 | 1995 Buick Riviera

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