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

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
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!
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