Vacuum to distributer - 1983 Chevrolet Monte Carlo

Climate Control System Condition Possible Sources Action

• Incorrect/erratic direction of airflow from outlet(s)

• No vacuum to the function selector switch
• Function selector switch leaks vacuum
• Air distribution door binding/stuck
• Vacuum line kinked/pinched
• Vacuum control motor
• Vacuum reservoir tank
• Vacuum actuator arm not connected to the door lever

• Go To Pinpoint Test A .

Either one has to go to true vacuum. Either to the carb/throttle body or the intake manifold. They do not go to heat operated vacuum sensors.

Vacuum leak. The distribution works by vacuum, so you must have a leak somewhere.

Duplicate question.

Here are the instructions with a diagram. If you need to enlarge the diagram save it to your picture files and then enlarge it there.

1. Disconnect battery ground cable, then drain cooling system. See: Engine, Cooling and Exhaust\Cooling System\Service and Repair

2. Disconnect heater hoses from heater core. Plug heater hoses and core fittings to prevent coolant spillage.

3. Remove bolt located below windshield wiper motor, attaching left end of plenum to dash panel.

4. Remove nut attaching upper left corner of evaporator or heater case to dash panel.
5. Disconnect vacuum control system supply hose from vacuum source, then push grommet and hose into passenger compartment.

6. Remove all instrument panel retaining screws and pull instrument panel back as far as possible without disconnecting any wire harnesses.
7. Loosen right door sill plate and remove side cowl trim panel.

8. Disengage temperature control cable housing from bracket on top of plenum. Disconnect cable from temperature blend door crank arm.

9. On models w/Automatic Temperature Control (ATC) , remove cross body brace and disconnect wiring harness from temperature blend door actuator and disconnect ATC sensor tube from evaporator case connector.
10. Disconnect vacuum harness at vacuum connector near floor air distribution duct.

11. Disconnect white vacuum hose from outside recirculating air door vacuum motor.
12. Remove two hush panels.

13. Remove one plastic push fastener retaining floor air distribution duct to left end of plenum. Remove left screw and loosen right screw on rear face of plenum. Remove floor air distribution duct.

14. Remove two screws from rear side of floor air distribution duct to plenum. To remove right screw, it may be necessary to remove the two screws attaching lower panel door vacuum motor to mounting bracket.

15. Remove push fastener attaching floor air distribution duct to left end of plenum, then remove floor air distribution duct.
16. Remove two nuts located along lower flange of plenum.
17. Carefully move plenum rearward, so that heater core tubes and plenum case upper stud clear openings in dash panel, then remove plenum from vehicle by rotating upper portion of the plenum forward, down and out from under instrument panel. It may be necessary to carefully pull lower edge of instrument panel rearward while plenum is being removed from behind instrument panel.
18. Remove retaining screws from heater core cover, then the cover from plenum assembly.

19. Remove retaining screw from heater core inlet and outlet tube bracket.

Heater core removal and installation diagram.






20. Pull heater core and seal assembly from plenum assembly.
21. Reverse procedure to install.

For 1998 Ford Truck Windstar 3.8L SFI 6cyl check this...

Fig. 1: Vacuum distribution schematic-3.8L engine

Fig. 2: Vacuum distribution schematic-3.8L engine


Hope this helps (reember to rate this answer).

The blend door is not working right or the in car air temperature sensor is faulty.
Removal & Installation Air Inlet Door Vacuum Motor To Remove:

1. Remove the instrument panel.
2. Remove the air inlet door motor mounting screws. CAUTION
   Do not attempt to bend any part of the air inlet duct door lever.
   
3. Rotate and remove the air inlet door vacuum control motor.

To Install:

1. Rotate and install the air inlet door vacuum control motor.
2. Install and tighten the mounting screws.
3. Install the instrument panel.

Defroster Door Vacuum Motor To Remove:

1. Remove the passenger air bag module from the instrument panel.
2. Disconnect the vacuum line and remove the mounting screws. CAUTION
   Do not attempt to bend any part of the defroster airflow mode door lever.
   
3. Rotate and remove the vacuum control motor from the defrost door lever.

To Install:

1. Rotate and install the vacuum control motor on the defrost door lever.
2. Install and tighten the mounting screws.
3. Connect the vacuum line to the vacuum control motor.
4. Install the passenger's air bag module.

Floor Console Register Duct Vacuum Motor To Remove:

1. Remove the floor console.
2. Remove the right-side instrument panel insulator.
3. Working from the passenger's footwell, disconnect the vacuum hose.
4. Remove the screws and the floor console register duct vacuum control motor. CAUTION
   Do not attempt to bend any part of the floor console register duct door lever.
   
5. Rotate and remove the vacuum control motor from the floor console register duct door.

To Install:

1. Rotate and install the vacuum control motor on the floor console register duct door.
2. Install and tighten the mounting screws.
3. Connect the vacuum hose to the floor console register duct vacuum control motor.
4. Install the insulator under the dash.
5. Install the floor console.

Panel/Floor Door Vacuum Motor To Remove:

1. Working through the driver footwell, remove the two screws and the shield. CAUTION
   Do not attempt to bend any part of the airflow mode door lever.
   
2. Label and disconnect the two vacuum hoses.
3. Remove the mounting screw.
4. Lift, rotate and remove the panel/floor door vacuum control motor from the door lever.

To Install:

1. Install the panel/floor door vacuum control motor on the door lever.
2. Install and tighten the mounting screw.
3. Connect the vacuum hoses in their original positions.
4. Install the shield on the vacuum motor.

Auxiliary Air Distribution Blend Door Actuator To Remove:

1. Remove the right rear quarter trim panel access panel. Auxiliary climate control housing removal and installation
   
   
2. Remove the auxiliary air distribution blend door actuator screws.
3. Disconnect the auxiliary air distribution blend door actuator connector.

To Install:

1. Connect the auxiliary air distribution blend door actuator connector.
2. Install the auxiliary air distribution blend door actuator screws.
3. Install the right rear quarter trim panel access panel.

Auxiliary Temperature Blend Door Actuator To Remove:

1. Remove the right rear quarter trim panel. Auxiliary climate control housing removal and installation
   
   
2. Disconnect the temperature auxiliary temperature blend door actuator connector.
3. Remove the temperature auxiliary temperature blend door actuator screws.
4. Remove the temperature auxiliary temperature blend door actuator.

To Install:

1. Install the temperature auxiliary temperature blend door actuator.
2. Install the temperature auxiliary temperature blend door actuator screws.
3. Connect the temperature auxiliary temperature blend door actuator connector.
4. Install the right rear quarter trim panel.

--- In-Car Temperature Sensor Removal & Installation To Remove:

1. Remove the instrument cluster finish panel.
2. Disconnect the in-vehicle temperature sensor connector.
3. Disconnect the in-vehicle temperature sensor aspirator tube.
4. Remove the in-vehicle temperature sensor screws.
5. Remove the in-vehicle temperature sensor.

To Install:

1. Install the in-vehicle temperature sensor.
2. Install the in-vehicle temperature sensor screws.
3. Connect the in-vehicle temperature sensor aspirator tube.
4. Connect the in-vehicle temperature sensor connector.
5. Install the instrument cluster finish panel.

Hello! Here is vacuum line diagram for your vehicle...Guru....Saailer

I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

the air distribution switch controls the air distribution and the fan, distribution switch in the 0 (straight down position) will be off. Car movement forces air into teh body, but with teh fan off there will be no air when the car stops. Does the fan run when the distribution switch is in any other position? it should respond to the speed settings of the fan switch.

There is a vacuum bottle accumulator that assists the distribution switch, sometimes this gets disconnected and the switch settings don't work.

Do you hear any noises if you turn the distribution knob while the car is running? suction noises, or flaps opening?

If not, then you likely have a vacuum problem (check for a white bottle in left front wheel housing, except convertible -> under the spare wheel, tank should have one or two vacuum lines connected to it (one for convertible). A disconnected or leaky line is the most likely cause.

Possible other causes are faulty air distribution switch; burned out fan motor; inoperative vacuum solenoid motors controlling air distribution flaps.

But check the vacuum accumulator first, if under the spare wheel, the lines are easily dislodged.