Why is the front blower not working at all ? Back vents work fine ?

Sounds like you've made some efforts, but you'll have to start at the climate control s themselves to see if there's a concern here with proper commands to the blower to function. Then, the system will need to be checked for power to the blower motor when it should be present. When it's found that power is missing, the circuit will need to be traced to find the root cause. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops