If you have no blower speeds at all check the fuse, then check the blower motor switch and electrical plug for a melt down situation, then check the blower motor itself.
Probably a bad blower motor. Try tapping the blower motor gently with a hammer when it isn't working. It that makes it work, replace the blower motor.
Check your blower motor relay!
Replace the blower motor speed resister.
There is nothing wrong with the motor there is something wrong with the switching circuits
Blower motor control relay under dash behind blower motor is bad or has water in it from cabin filter port.
if the blower motor works most likely heater core is bad. need more info
Work you way from the blower motor first by checking that it has both power and ground and then check the rest of the electrical system............
You need to replace the blower motor resistor. I've been there done that.
If the blower works on the defrost mode only, you could have a disconnected vacuum supply line coming from the engine. If the blower motor doesn't work on any mode or speed you could have a blown fuse, burned out blower motor speed resistor, bad switch or a bad blower motor.
usually the blower motor resistor pkg. located on or near the blower motor
blower motor won't work
If you are saying the blower motor will not work, then check the fuse. If the fuse is not blown, then it is possibly a defective Blower Motor Resistor Pack, blower motor, or blower motor speed control switch, in that order.If you are saying the blower motor will not work, then check the fuse. If the fuse is not blown, then it is possibly a defective Blower Motor Resistor Pack, blower motor, or blower motor speed control switch, in that order.