Hopefully I can rule out the actuator. Tech swapped out actuator two years ago to diagnose a problem but didn't solve it (turned out to be the infamous wiring harness).
At almost 116K, it could be the plug wires, but since the problem occurred AFTER the water pump was replaced, I would think a vacuum hose somewhere near the pump.
2009 ML350 (84K) - Family vehicle
2001 CLK430 Cabriolet (71K) - Wife's car
2005 BMW 645CI (124K) - My daily driver
2012 Mustang V6 (60K) - Daughter's car