You're going to have to do some diagnostic work. First check the fuse. If that is OK then, if you are getting +12V to the blowers when the switch is turned on. HTH Henry
The Ventilation System fan, right? Mine quit and it had to do with a burnt circuit board end connector, which resulted in a bad connection. Damage from a previous owner, possibly due to the AC clutch siezing. Thor
are you using a/c or heat ? are blower motors running ? they are in front left and right close to firewall