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Q:

drivers side heat is cool while passenger side is hot on 2007 Lincoln MKX

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
drivers side heating is cool no matter what temp is set while passenger works at whatever temp is set
Coolant level is fine and thermostat is working correctly
(1) Answer
Sounds like a possible temperature blend door actuator - left side - may be failing. A diagnostic test should be done with the Dual Mode Temperature Control (DMTC) system.