The temperature control blower fan makes a high pitch noise and only work at the high setting. Do I need to replace the blower fan wheel? If so how do I do it?
SOURCE: this car has the automatic temperature control system
The hot/cold switch is probably bad.you have a blend door box that opens to let the cold air in and closes to let the hot air in.From what you are saying this part is no responding to the switch movement.Make sure power is at the switch and power should go through the switch when put on cold air this moves the blend door.Some times the blend door goes bad and has to be replaced its under the dash on the right side.
SOURCE: No heat and the heater core is good, also heater
flapper door inside duct work not opening and closing properly. check my tips section for heat diagrams
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