Question about 1991 Chevrolet C1500

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Need a middle mode actuator/diffuser for my 91 c1500

The component that switches your air flow inside the dash. when i run my air i dont have any. need to know where i can find one and if thats the name

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If you can hear the blower motor and it changes when you command it to then what you need is a mode door actuater

Posted on Jan 17, 2009

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2002 Cadi Deville, can't get any locks to operate with remote or dash push buttons, the remote operates everthing but the locks! When the remote door lock is pressed, lites flash,horn blows locks not.


Power Door Lock Operation
The vehicle is equipped with power door locks. Each lock actuator is powered and controlled by the door module mounted in the individual door, but the rear integration module (RIM), which is the master control for the door lock system, determines when the lock functions are permitted. The RIM receives and examines the requested lock function from the individual door modules, or from the remote function actuator (RFA) via the class 2 serial data circuit. The RIM also examines the transmission shift selector position and the ignition switch position information available over the Class 2 serial data circuits. If the RIM determines that a lock or unlock function is permitted, it sends a class 2 message back to the individual door modules commanding them to perform that Lock or Unlock function.
Power Door Lock Components
The power door lock system consists of the following components:
?€¢
Driver door lock switch


?€¢
Passenger front door lock switch


?€¢
LH rear door lock switch


?€¢
RH rear door lock switch


?€¢
LH middle door lock switch (w/ V4U)


?€¢
RH middle door lock switch (w/ V4U)


?€¢
Driver door switch assembly (DDSA)


?€¢
Driver door module (DDM)


?€¢
Passenger front door module (PDM)


?€¢
LH rear door module (LRDM)


?€¢
RH rear door module (RRDM)


?€¢
Left middle door module (LMDM) (w/ V4U)


?€¢
Right middle door module (RMDM) (w/ V4U)


?€¢
Driver door lock actuator


?€¢
Passenger front door lock actuator


?€¢
LH rear door lock actuator


?€¢
RH rear door lock actuator


?€¢
LH middle door lock actuator (w/V4U)


?€¢
RH middle door lock actuator (w/ V4U)


?€¢
Driver door cylinder unlock switch


?€¢
Rear integration module (RIM)


?€¢
DRVMDL fuse (10-amp)


?€¢
PASS MDL fuse (10-amp)


?€¢
RRDR MDL fuse (10-amp)


?€¢
Class 2 serial data link

Sep 27, 2016 | 2002 Cadillac Deville

1 Answer

Fuse diagram 1996 grand prix


On a 1996 model you probably have vac actuators that control air flow. Look under the dash and you may be able to see the actuator that controls flow to the defrost and vents. There would be another one for temp control.

Jul 02, 2013 | Cars & Trucks

1 Answer

The air only blows out only on defrost on my 91 chevy truck


air blows out only defrost possible cause could be faulty ac and heater mode switch or broken vacuum line to ac and heater vacuum actuator.you have to remove ac and heater control switch to check it out.

Dec 05, 2011 | 1991 Chevrolet C1500

1 Answer

The selector switch will not change the air flow from top to bottom vents is the switch bad or what?


It is the vent door actuator motor,it is located on the bottom of the blower box toward the middle of the dash underneth.It is a flat box with small wires going to it.

Mar 30, 2011 | 2000 GMC Sierra

1 Answer

Front heater dont work but back does


Sounds like the heater control actuator/door isn't opening. Should be under the dash middle to passengers side... on the heater box. The temp switch on the dash causes the actuator to open and close the baffle/door. It may have an arm thet moves the door or it might be that the actuator itself mounts to the heater box. With vehicle running, turn the temp control and watch to see if the actuator is moving. One actuator will move to position the defrost/mix/vent/floor... usually on the drivers side middle... the other should open the heater blend door. Usually hard to get to on most vehicles. Hope this helps, Mike

Dec 30, 2010 | 1997 Ford Expedition

1 Answer

Dash air flow problem


This could be a couple of different things. It could be the control head itself, an actuator inside the dash, or the blend door, or the blend door motor itself. The first thing I would do is turn the air on, put my ear close to a vent and move the switches on the control from floor to dash to vent. if you can hear any clicking at all you know it is not the control head. In that case, you mnay have to take the dash apart to go any further, and if youve never done this before I would not recommend it.

Dec 08, 2009 | 2004 Dodge Ram 3500 Truck

1 Answer

My blazer does not blow any hot it does blow cold but also i'll put it on defrosters and it just continues to blow out of vents it wont switch out of vents.. any ideas?


Check the blender door:

Removal & Installation
  1. Disconnect the electrical connector to the mode actuator that is located on the left side of the air distribution case.
  2. Remove the screws.
  3. Remove the adjuster links from the control lever.
  4. Remove the mode actuator.
  5. Adjust the mode actuator by completing the following steps:
    • Connect the electrical connector to the actuator.
    • Turn the ignition switch to the RUN position. Allow the self-positioning of the actuator.
    • Turn the ignition switch to the OFF position.
    • Remove the actuator from the electrical connection.
To install:
  1. Install the mode actuator.
  2. Install the screws.
  3. Install the adjuster links to the control lever.
  4. Connect the electrical connector.
  5. Test the circuit operation
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This is down under by your feet....


The other thing it may be with the heat is the heater water control valve:

Removal & Installation CAUTION Never open, service or drain the radiator or cooling system when hot; serious burns can occur from the steam and hot coolant. Also, when draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantities. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.

  1. Drain the cooling system.
  2. Remove the access panel nut near the pollen filter.
  3. Remove the access panel.
  4. Remove the following components from the hot water flow control valve:
    • The vacuum hose
    • The remaining hose clamps
    • The remaining hoses
  5. Remove the hot water flow control valve.

To install:
  1. Install the hot water flow control valve.
  2. Install the following hot water flow control valve components:
    • The hoses
    • The hose clamps
    • The vacuum hose
  3. Install the access panel.
  4. Install the access panel nut until fully seated and not stripped.
  5. Fill the cooling system.
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Heater water control valve

This is in your engine compartment.


Dec 01, 2009 | 2000 Chevrolet Blazer

2 Answers

Heating system only blows out hot air through the vents


I would look at the air blend doors first, it sound like they are not working or your control in the dash is not working send a signal to them. they work by changing the air from hot to cold or in between.

Avalanche, Sierra And Silverado
  1. Remove the floor air outlet duct extension (1) from the floor duct (2). 0900c152801c9c8a.jpgRemove the floor air outlet duct extension (1) from the floor duct (2)
  2. Disconnect the electrical connection at the blend door actuator (10). 0900c152801c9c8b.jpgBlend door actuator and related components
  3. Remove the blend door actuator mounting screws from the HVAC module.
  4. Remove the blend door actuator as an assembly with the actuator cam. 0900c152801c9c8c.jpgRemove the blend door actuator mounting screws from the HVAC module
To install:
  1. Install the blend door actuator as an assembly with the actuator cam.
    1. Line up the heater/defroster valve lever with the blend door actuator cam slot.
    2. Line up the A/C valve lever with the blend door actuator cam
  2. Install the blend door actuator mounting screw to the HVAC module.
    1. Tighten the blend door actuator mounting screw to 14 inch lbs. (1.6 Nm).
  3. Connect the electrical connection at the blend door actuator (10). 0900c152801c9c8b.jpgBlend door actuator and related components
  4. Install the floor air outlet duct extension (1) to the floor air duct (2).
C/K Series
  1. Disconnect the electrical connector to the mode actuator that is located on the left side of the air distribution case.
  2. Remove the screws.
  3. Remove the adjuster links from the control lever.
  4. Remove the mode actuator.
  5. Adjust the mode actuator by completing the following steps:
    1. Connect the electrical connector to the actuator.
    2. Turn the ignition switch to the RUN position. Allow the self-positioning of the actuator.
    3. Turn the ignition switch to the OFF position.
    4. Remove the actuator from the electrical connection. 0900c152801c9c8d.jpgBlend door actuator-C/K Series
To install:
  1. Install the mode actuator.
  2. Install the screws.
  3. Install the adjuster links to the control lever.
  4. Connect the electrical connector.
  5. Test the circuit operation

Nov 27, 2008 | 2001 Chevrolet Silverado

2 Answers

Heater


Pull the AC control in the dash and verify that there is vacuum going to it, all the different air diversion doors are operated by seperate vacuum motors controlled by the ac control head in the dash, as you switch it it sends vacuum to the correct location to work that door for the desired air outlet, dash, floor etc..

Sep 18, 2008 | 2004 Chrysler Pacifica

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