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Q:

Low or no heat from heater - blower runs on 2005 Buick LeSabre

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Little to no heat from heater; blower runs; started before I changed thermostat - code was set; have tried to bleed air at thermostat valve.
(1) Answer
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it is possible the following happened:
1. switch is not working
2.blend door is not working (possible actuator)
3. electrical problem

this is a job for a technician to run down. these controls are all electrical and any can cause this. hope this helps!