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Vacuum door broken, need to repair or replace

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2000 grand am vents on dash stuck on one setting. Ac blows cold and heat blows hot. Blows on face and heat only. Selector won't change setting to defrost, face only, etc.


The mode switch is vacuum controlled , do you know anything about vacuum controls , how to test vacuum circuits ? here is a factory diagnostic flow chart for what to test.
HVAC Air Delivery System Check
Step
Action
Yes
No
1
Start the engine.
Turn the blower motor fan ON and select an air outlet mode.
Does air flow out of the selected HVAC outlet ducts?
YES - Go to Step 3
NO - Go to Step 2
2
Did the customer concern mention that the air discharges out the correct ducts at first, but then changes during higher engine RPM?
YES - Go to Step 7
NO - Go to Step 3
3
With the engine running, cycle the HVAC controls through all the modes.
Does the air come out of the selected outlet ducts?
YES - Go to Step 18
NO - Go to Step 4
4
With the engine running, take a vacuum reading at the manifold vacuum port that supplies vacuum to the HVAC vacuum control assembly.
Is there engine vacuum?
YES - Go to Step 6
NO - Go to Step 5
5
Repair the no vacuum condition.
Is the repair complete?
YES -- Go to Step 18
--
6
Take a vacuum reading at the vacuum supply line at the HVAC vacuum control assembly.
Is the vacuum reading the same as the engine vacuum?
YES - Go to Step 11
NO - Go to Step 8
7
Disconnect the vacuum supply line from the HVAC vacuum control assembly.
With the vacuum gauge connected to the vacuum supply line, re-start the engine and turn the engine OFF.
Does the system lose vacuum after turning OFF the engine?
Go to Step 8
Go to Step 11
8
Inspect for leaking or collapsed vacuum lines between the engine manifold vacuum port and the HVAC vacuum control assembly.
Are the vacuum lines leaking?
Go to Step 9
Go to Step 10
9
Repair or replace the collapsed or leaking vacuum line.
Is the repair complete?
Go to Step 18
--
10
Replace the vacuum reservoir tank.
Is the repair complete?
Go to Step 18
--
11
Using an external vacuum source, apply vacuum to the appropriate vacuum line at the connector to the HVAC vacuum control assembly.
Does the actuator retract?
Go to Step 17
Go to Step 12
12
Inspect for leaking or collapsed vacuum lines between the actuator and the connector to the HVAC vacuum control assembly.
Are the vacuum lines leaking?
Go to Step 9
Go to Step 13
13
Disconnect the vacuum line from the actuator.
Apply an external vacuum source to the actuator.
Did the actuator retract?
Go to Step 14
Go to Step 16
14
With the actuator disconnected, inspect the door for binding.
Does the door move freely?
Go to Step 16
Go to Step 15
15
Repair the appropriate binding door.
Is the repair complete?
Go to Step 18
--
16
Replace the appropriate vacuum actuator.
Is the repair complete?
Go to Step 18
--
17
Replace the HVAC vacuum control assembly.
Is the repair complete?
Go to Step 18
--
18
Cycle the HVAC controls through all modes to verify proper operation.
Did you correct the condition?
System OK
--

Apr 28, 2018 | Pontiac Grand Am Cars & Trucks

1 Answer

When you turn on heater it dont blow hot & it dont change to vent, defrost,floor


The control head that select heat/cold and where the air goes is vacuum controlled. There two vacuum "motors" under the dash that are used to move the blend doors to the heat or A/C position and for routing the air to the proper vent ducts. If neither is operating, chances are that the vacuum line that comes to the control head is broken. You need to locate it and repair it. If it is good, then you have issues in the blend box with the blend doors or the vacuum motors.

Oct 21, 2015 | 1980 Chevrolet Malibu

1 Answer

I need instructions and diagrams to replace or repair 1993 Dodge Shadow HVAC vacuum actuator motor and or mode door actuator.


You shouldn't have to pull the heater core. The older dodges were very popular for leaking out of the switch assembly itself in the dash. Have you checked under the hood for vacuum leaks?

May 28, 2017 | Dodge Cars & Trucks

2 Answers

I have a 2002 Chevy Impala the heat and air comes out all the vents at the same time can't direct it


After looking at the service info for the HVAC system for your vehicle , it sounds like your system lost vacuum somewhere ! The position of the mode doors determine where the air comes out at . The doors have vacuum controlled actuators , on the back of the mode switch vacuum lines are connected to it ! To check for vacuum at the switch you'll need to take HVAC control module out of the dash ! There is also a vacuum reservoir or tank under the dash near the HVAC assembly. You could look under the hood in the engine compartment an look for a disconnected vacuum hose from the engine intake manifold !
Step
Action
Yes
No

1

  1. Start the engine.
  2. Turn the blower motor fan ON and select an air outlet mode.
Does air flow out of the selected HVAC outlet ducts?
Go to Step 3 yes
Go to Step 2 no

2

Did the customer concern mention that the air discharges out the correct ducts at first, but then changes during higher engine RPM?
Go to Step 7 yes
Go to Step 3 no

3

With the engine running, cycle the HVAC controls through all the modes.
Does the air come out of the selected outlet ducts?
Go to Step 18 yes
Go to Step 4 no

4

With the engine running, take a vacuum reading at the manifold vacuum port that supplies vacuum to the HVAC control vacuum valve.
Is there engine vacuum?
Go to Step 6 yes
Go to Step 5 no

5

Repair the no vacuum condition.
Is the repair complete?
Go to Step 18 yes
--

6

Take a vacuum reading at the vacuum supply line at the HVAC control vacuum valve.
Is the vacuum reading the same as the engine vacuum?
Go to Step 11
Go to Step 8

7

  1. Disconnect the vacuum supply line from the HVAC control vacuum valve.
  2. With the vacuum gauge connected to the vacuum supply line, re-start the engine and turn the engine OFF.
Does the A/C system lose vacuum after turning OFF the engine?
Go to Step 8
Go to Step 11

8

Inspect for leaking or collapsed vacuum lines between the engine manifold vacuum port and the HVAC control vacuum valve.
Are the vacuum lines leaking?
Go to Step 9
Go to Step 10

9

Repair or replace the collapsed or leaking vacuum line.
Is the repair complete?
Go to Step 18
--

10

Replace the vacuum reservoir tank. Refer to Vacuum Tank Replacement .
Is the repair complete?
Go to Step 18
--

11

Using an external vacuum source, apply vacuum to the appropriate vacuum line at the HVAC control vacuum valve connector. Refer to HVAC Vacuum Schematics .
Does the actuator retract?
Go to Step 17
Go to Step 12

12

Inspect for leaking or collapsed vacuum lines between the actuator and the HVAC control vacuum valve connector.
Are the vacuum lines leaking?
Go to Step 9
Go to Step 13

13

  1. Disconnect the vacuum line from the actuator.
  2. Apply an external vacuum source to the actuator.
Did the actuator retract?
Go to Step 14
Go to Step 16

14

With the actuator disconnected, inspect the door for binding.
Does the door move freely?
Go to Step 16
Go to Step 15

15

Repair the binding door. Refer to the appropriate repair.
?€¢
Defroster Door Replacement


?€¢
Mode Door Replacement


?€¢
Recirculation Door Replacement

Is the repair complete?
Go to Step 18
--

16

Replace the vacuum actuator. Refer to the appropriate repair.
?€¢
Defroster Valve Actuator Replacement


?€¢
Mode Actuator Replacement


?€¢
Recirculation Actuator Replacement

Is the repair complete?
Go to Step 18
--

17

Replace the HVAC control vacuum valve. Refer to HVAC Control Vacuum Valve Replacement .
Is the repair complete?
Go to Step 18
--

18

Cycle the HVAC controls through all modes to verify proper operation.
Did you correct the condition?
System OK
--
Hope this helps an good luck !

May 08, 2015 | 2002 Chevrolet Impala

1 Answer

I have a Cadillac CTS 2003. I live in AZ and I


If the system is charged and the compressor is operating, you should be getting A/C. The problem would most likely be a jammed or malfunctioning blend door under the dash. This can keep the airflow from passing through the evaporator and can even cause it to expel heat from the heater core instead. It is not easy to troubleshoot and repair these problems as there is limited space to work under the dash. The problem can be vacuum related as most blend doors operate on what is called vacuum motors. There is also a linkage attaching the vacuum motor to the blend door than can be broken or damaged. The door itself could be jammed or broken inside the housing. Good luck.

Sep 06, 2014 | Cars & Trucks

2 Answers

What diverts air to defrost. Air comes out vents and floor. ac works and heat , but won't go up to dash vents. The flaps are working.


You just THINK the flaps are working, but apparently the top vent is not. These multiple flaps are controlled by vacuum and you have a line off to that particular flap. This means the flap won't open and the vacuum leak, whether you can hear it or not, is making you lose MPG also, though slight. The vacuum line could be cracked or disconnected from the flap or at the vacuum block on the back of the lever unit.

Aug 18, 2014 | Cars & Trucks

1 Answer

99 disco 2 door lock problem. front passenger door will not lock or unlock with key in drivers door or central locking switch on dashboard. replaced door lock/ actuator mechanism but no change. key fob...


is the locking system mechanical,electrical,vacuum????. If mechanical:linkage came loose?,if electrical:loose or broken wire?,if vacuum:vacuum line punctured ,pinched or broken??, Don't buy parts unless you pinpoint the problem. Alberto

Feb 12, 2014 | Cars & Trucks

1 Answer

Broken vacuum flap for defrost on 1997 jeep wrangler repairable?


yes parts are easily accsessable online,check make and model

Nov 01, 2012 | Motorsports

1 Answer

I think my vacuum is even older. It's a tank type. My carpet attachment won't spin where the brush rotates.


The first thing to do is make sure the power nozzle motor is working. If it is, then check the belt by trying to spin the brush. If it spins freely, the belt is broken and needs replaced.
If the power nozzle motor is NOT running, there could be several things.
1. Make sure brush is clear and cleaned of all loose strings, cords, and other foreign matter.
2. Press reset button. Try vacuum again.

If it still doesn't run, ensure all wire connections are tight, and have no indication of arcing, i.e., blackened or burnt connections. Any such connections need replaced.
There could be a broken wire in the hose. Usually the hose will need to be replaced, but occassionally it can be repaired.
Internal wiring worn or broken. Needs repaired/replaced.
All repairs should be done by an authorized Aerus Electrolux service technician at an Aerus store. Check the phone book, or go to the following site to locate the store nearest you.

http://www.aerushome.com/storelocator/

Oct 13, 2010 | Electrolux UltraLux 2000 Bagged Canister...

1 Answer

Dyson vacuum cleaner DC04


I would suggest you invert the vacuum and remove the plate covering the spinning brush assembly. You should check the belt located on one side of the spinner brush to see if it is worn or broken. Also remove anything wrapped around the brush that could be affecting it. Ensure the brush is free to rotate and seated correctly. If the belt is worn or broken, or the spinner brush is unable to spin, replacements are available from a licenced repair facility. I hope it helps! Good Luck!

Jan 29, 2008 | Vacuums

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