My 2013 ford tauras ac just suddenly stop blowing. What do you think?

It sounds like your blower motor is not turning on for an unknown reason. The muffled noise could have been deterioration in progress, which has now resulted in system failure. Accessing the blower motor is a good first step to see if debris is present causing malfunction. Often times, removing the cabin air filter can assist in accessing the location the blower motor is in. There could be multiple causes for a blower motor not working. This will require professional troubleshooting. www.repairpal.com/repair-shops