Rear Blend Door ACTUATOR-does a replacement need programming?

We believe a blend door actuator has gone out for the rear HVAC on a 2002 Chevy Trailblazer EXT with automatic climate contral and rear HVAC control.

The unit is locted in the right rear of the vehicle on top of the air box and to the left / downstream of the blower. The same actuator is also located upstream from the blower.

If we replace this actuator, is there any programming required?

(we believe this device is controlled by some type of network ID so it might make sense that the unit would need to be programmed.)

Can we replace the part ourselves or is GM programming required? Thanks.

Electric blend door actuators are usually plug and play items. I've never seen one need a programming. They usually take a signal from the temp control lever/knob & that's it.

Joel

I'm having the same problem with my '02 TB but my problem is with the vents in the front. Where exactly is this blend door actuator and is it easy to replace?. Any help would be appreciated. Thanks

I'd work the controls and listen carefully for where the noise is coming from. For the digital controls, if the calibration seems out of whack after a r/r, I'd remove the battery cables from the battery and touch them together to discharge any capacitors/memory. This seems to be a catch-all 'fix' for many computer dependant vehicles now.

Joel