No heat, no cool, no temp. control, manual controls, defrost only, why? on 1997 Buick LeSabre

Replacing heater core because of leak, also air/Mix actuator/motor, before I put it all back together, what else could be problem? A beautiful car with 230,000 miles and going strong!

Asked by for the 1997 Buick LeSabre
maybe a connector is not connected
Sorry Buck, wrong answer!