Not getting heat in cab.... Discovered this rod was not moving at all .... When I search for Blend Door or similar the right part does not come back....so what'* this called and information on replacing this actuator motor.....

It'* a module. https://www.wholesalegmpartsonline.c.../19153465.html

Programmer, A/C Electric Temperature and Motor Control.
GM part no. 19153465.
When you change the temp on the dash this controller moves very slowly.
check you wiring.
also, take the rod off and see if you can move the door manually.

OEMcats.com has this part for $165.

When you go to the site it says that part number is No Longer Available??

What exactly do you go to, I can't find it.....................

Cross Interchange Parts
Factory Number
ACDelco 1572086
GM 16135121
GM 16165978

So far this is the only thing I can find.
https://www.autoecmstore.com/products/16135121

I'd try the used car parts site for local junkyards with it..
https://www.car-part.com/

good idea William, I would try a junkyard too at that price.
and sorry about that Dandyd, I put up the wrong link. Here you go.

GM 19153465 Programmer, genuine OEM part

I found exactly what I needed on Ebay... and it was $100.00 worked like a charm.

Cool! Thanks for letting us know how it turned out!