Why is my 1999 Silverado stuck on heat after actuator swap?

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May 15, 2025 at 7:11 pm #1584 Reply
Danny
99 Silverado 1500 climate control stuck on heat… Changed the blend door actuator but once I plug in the blend door actuator it turns all the way right and the all the way left and stays like that… The controls don’t move it, and it seems like it just stops working, did it with 2 new actuators what could fix this? It’s getting hot, and I need my A/C.
May 15, 2025 at 7:17 pm #1585 Reply
Thomas
Make sure that the blend door isn’t broken. If the actuator over travels because of a broken door, it will just stop once it gets out of range.
May 15, 2025 at 7:17 pm #1586 Reply
Tonyy
Sometimes you need to pull the fuse, wait about a minute and then put the fuse in, it recalibrates, OR you can rig it by leaving the actuator out and use a screw to leave it stuck on cold. Not stupid if it works!
May 15, 2025 at 7:18 pm #1587 Reply
James
Try pulling the HVAC fuses under the hood think there are 3 or 4 of them leave out for a couple of minutes put back in have climate controls set to the middle on vent and blower speed low then turn the key on let it cycle for a reprogram for a couple minutes then see if it recalibrated.
May 15, 2025 at 7:18 pm #1588 Reply
Anthony
I had a similar issue with a Sebring. I simply wired the door in the open position.
May 15, 2025 at 7:18 pm #1589 Reply
Ken
I fixed all my Silverado electrical and other issues by trading it for a F150. 8 years trouble free now!
May 15, 2025 at 7:18 pm #1590 Reply
William
I had this happen in a 09 Impala I just took the actuator apart and used the gear to move the switch (hot, cold) some time it switched from road vibration I can only assume. Since nothing was hooked up.
May 15, 2025 at 7:19 pm #1591 Reply
Robby
Make sure it’s the right actuator. Manual climate and auto actuators look the same amd most parts places don’t double-check.
May 15, 2025 at 7:19 pm #1592 Reply
Ned
Don’t plug it up and watch it turn in your hand. It will damage it. They are different but look alike. It’s best to buy OEM. Bolt them in and then turn it on and off. Never out of it position.
May 15, 2025 at 7:19 pm #1593 Reply
Steve
Try a hard reset. Disconnect the battery and hold the terminals together to kill any residual voltage. Wait 3 minutes, then connect the battery. Wait 2 minutes before doing anything! No key on, no nothing.

After 2 minutes, start the truck and wait another two minutes before touching anything.

HVAC will run through self calibration during this time.
May 15, 2025 at 7:20 pm #1594 Reply
Everett
It’s doing what It’s supposed to do.

My diag leads me to perform a temp dial check. Sounds like a bad temp selection potentiometer.
May 15, 2025 at 7:20 pm #1595 Reply
Jeremy
Sounds like the HVAC head unit is bad. Also, don’t plug the actuator in until it’s installed properly onto the door. Vehicles that old don’t need to be calibrated.
May 15, 2025 at 7:20 pm #1596 Reply
Robert
Blend door actuators have a maximum travel in each direction. Don’t plug the actuator in unless you have it in place because you more than likely will damage it. Also throw away the Dorman trash and buy a GM actuator.
May 15, 2025 at 7:20 pm #1597 Reply
Patrick
Needs recalibrated, remove fuse for several minutes, reinstall fuse and turn key on .let it recalibrate before you touch any AC control.
May 15, 2025 at 7:21 pm #1598 Reply
George
1st make sure you have the right actuator…they all look the same…make sure the pins where the connector plugs in ahev the same amount of pins and are in the same place as the old actuator.
May 15, 2025 at 7:21 pm #1599 Reply
Greg
Yes disconnect the battery for 20 minutes reconnect battery.. have havc controls in the off position. Start engine do not touch havc controls for at least three to four minutes it will recalibrate to factory settings
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Why is my 1999 Silverado stuck on heat after actuator swap?

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