Blend door actuator?

Good morning.

Can you identify which one you need to replace? I attached a picture for you to view.

Roy

Okay, let me check.

That would be part two in the image the master loaded. It goes through the hole and snaps onto the plastic axle the door turns on. It can be replaced but you cannot pull it free with the case assembled. The inner part has two wide slots and inside the piece is a molded retainer collar. As it goes over the shaft it expands and snaps in place. To assemble you put it through the hole in the case, then push the doors axle in and it locks in. Cutting an access hole is about the only way unless you remove the entire HVAC carrier and open it that way.

What I do to repair them, if the owner approves, is drill some 1/8" holes at four corners, then cut between them with a vibrating cutter and remove the piece. Clean up the edges and any plastic swarf. Now repair the door driver and test it. Now to reinstall the access panel I will use four short sheet metal screws. Hold the panel in place and screw in two screws diagonally, then the other two. Now use either black silicone or similar (two part stick epoxy works but is not fun to remove for the next repair) and fill the cut line and over the screws. Let it cure fully. Probably similar to the videos.

Welcome to 2CarPros.

I'm not sure I understand. What has the new switch replaced? As far as the temperature issue, the vehicle has a blend air door actuator. It is an small electric motor that moved the temp door to different positions to provide different tempertures.

Can you explain the switch that was replaced? Also, I am going to provide the directions for actuator replacement. Locate the actuator and see if anything has been done to it. Also, see if it working when you try to change temperatures.

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Here is a link that shows in general how one is replaced:

https://www.2carpros.com/articles/replace-blend-door-motor

Here are the directions specific to your vehicle. The attached pictures correlate with the directions.

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2006 Jeep Truck Grand Cherokee 4WD V6-3.7L VIN K
Single Zone/Dual Zone LH Side
Vehicle Heating and Air Conditioning Air Door Actuator / Motor Service and Repair Procedures Blend Door Actuator Single Zone/Dual Zone LH Side
SINGLE ZONE/DUAL ZONE LH SIDE
NOTE: The single zone heater - A/C system is equipped with a single blend door actuator. The dual zone system has two blend door actuators, one for the driver side blend - air door and one for the passenger side blend - air door.

REMOVAL

WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, DISABLE THE AIRBAG SYSTEM BEFORE ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. DISCONNECT AND ISOLATE THE NEGATIVE BATTERY (GROUND) CABLE, THEN WAIT TWO MINUTES FOR THE AIRBAG SYSTEM CAPACITOR TO DISCHARGE BEFORE PERFORMING FURTHER DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE PERSONAL INJURY OR DEATH. See: Air Bag(s) Arming and Disarming > Service and Repair

pic 1

1. Disconnect and isolate the negative battery cable. See: Battery Cable > Service and Repair
2. On LHD models, remove the instrument panel silencer from the driver side of the instrument panel.
3. On RHD models, remove the glove box from the instrument panel.
4. Remove the three screws (1) that secure the blend door actuator (2) to the left side of the HVAC air distribution housing (3).
5. Remove the blend door actuator from the air distribution housing and disconnect the HVAC wire harness connector (4) from the actuator.
6. Remove the blend door actuator from the vehicle.

INSTALLATION

pic 2

1. Position the blend door actuator (1) into the vehicle.
2. Install the blend door actuator onto the left side of the HVAC air distribution housing (2). If necessary, rotate the actuator slightly to align the splines on the actuator output shaft (3) with those on the blend door cam (4).

pic 3

3. Install the screws (1) that secure the blend door actuator (2) to the left side of the air distribution housing (3). Tighten the screws to 2 N.m (17 in. lbs.).
4. Connect the HVAC wire harness connector (4) to the blend door actuator.
5. On LHD models, install the instrument panel silencer onto the driver side of the instrument panel.
6. On RHD models, install the glove box into the instrument panel.
7. Reconnect the negative battery cable.

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Let me know if this helps.

Joe

Try pulling the hvac fuse with key on for 60 seconds then reinstall, sometimes it resets if that doesn't work see if actuator worksit may be vacuum operated.

Check for a vacuum leak, it may have a bad hose coming from engine and not giving enogh vacuum to operate the actuators.

The actuators are not vac operated. Thanks though.

Then see if they are getting power and pull the hvac fuse for 60 seconds as they may reset. Our manual said they were but it can be wrong.

Sorry I forgot to mention that I already checked that before. They don't always get power. I can adjust the temperature and nothing comes up on the voltmeter. 5 minutes later I'll get a reading when I adjust the temp. It will work a few times, and then stops working again. I have pulled that fuse and reset the system too. It worked ok for a few minutes, and then stopped again.

If you have a pro tpe scanner see if you can scan it ornot for any codes, it may be a control head problem then.

I don't have any scanner but I pulled the codes using the built in method. It gave me code 54 and code 56 (basically pointing to a failure of the blend doors to move properly). I disconnected the battery for a few minutes, reconnected it, set the controls to auto, and then turned the key on to recalibrate it. The codes came back again. I've already had the blend door and actuators checked.

Only thing I can tell yo uis to check for a shortin wiring. Or linkage messed up etc. Or temp door bad. Iknow it'snot much info but that is all we have. It's the same thing for both doors.

OK as your issue is that the drivers side is not responding properly you are in luck. The drivers side blend door motor is located right behind the glove box and is not difficult to change. Disconnect the battery negative terminal. Remove the glove box, remove the trim panel under the dash. Then remove the electrical connector on the actuator and then the 2 screws. Remove the actuator. Install the new one. Replace the wiring and covers. Reconnect the battery cable. Turn the heater temp controls to full hot and start the engine. The system will run a calibration and you should be able to tell if the actuator was the issue.

Book time says 0.3 hours, or about 20 minutes which is about right.