If you mean that the blower motor runs even after turning the key off...the resister to the blower motor has to be bad to allow this continuosly get current...:)
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If you have a variable speed blower motor, a bad motor speed controller can keep it running even with the key out of the ignition. See this post on blower motor controllers. https://ricksfreeautorepairadvice.com/blower-motor-wont-shut-off/
With the A/C frosted up air cannot circulate the evaporator is blocked. Now that it is thawed can you rotate the fan, try that if it still doesn't blow air. The ICE from the frost could have damaged the blower.
Doesn't it work in any speed ? Could have Blower Motor Control Processor if yours has automatic HVAC .
Or if manual it has blower motor resistor . Both are located under passenger side dash . Remove insulator panel under the dash if it has one !
ORO How to replace blower motor resistor in Chevrolet Silverado
Lots of manufacturers have wired the electric radiator cooling fan circuit to the battery direct rather than through the ignition switch controlled supply.
Cars of this type often have the fan running for several minutes after switching off and the fan can restart again later for a short time as the mass of the engine continues to release heat into the coolant and the thermo-syphon action causes circulation.
If your car has HVAC where you set a temp (like 75) this is the automatic unit. The blower controller often fails and the blower will continue to run after the car is turned off.
If you're referring to the heater "FAN" running continuously, then its likely to be your blower motor resistor.
The heater blower motor (under the dash) has constant power supplied from the battery, but is controlled by the blower "resistor" - usually mounted on the blower motor assembly. If one or more of the blower resistor coil wires are faulty, the motor will either not work on one of the fan settings, or will constantly run by itself.
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