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What would cause a 2000 Blazer not to change from ac heat?

* Faulty blend door: The blend door is a flap that controls the flow of air from the heater core and the evaporator. If the blend door is not working properly, it can prevent the air from being heated or cooled.

* Faulty temperature control sensor: The temperature control sensor sends a signal to the HVAC control module to tell it what temperature the air should be. If the temperature control sensor is not working properly, the HVAC control module will not be able to regulate the temperature of the air.

* Faulty HVAC control module: The HVAC control module controls the operation of the entire HVAC system. If the HVAC control module is not working properly, it can prevent the system from changing from AC to heat.

* Low refrigerant level: If the refrigerant level in the air conditioning system is too low, the system will not be able to cool the air properly. This can cause the system to switch to heat mode in an attempt to compensate.

* Electrical issues: A variety of electrical issues can also prevent the HVAC system from changing from AC to heat. These include faulty wiring, loose connections, and damaged fuses.

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