Blower wont work on lower speeds?

Most likely the blower motor resistor.

You need to take off the under dash paneling, then lay outside the car and put your head where the passengers feet go. As far back as possible you will see a connector that fits into the resistor. Unplug it, plug in the new resistor to test it, then unscrew the screws holding the resistor with the 7/32 socket then put the new resistor in.

The resistor is next to blower motor in same housing.

Why yes I do. You need to replace your blower motor resistor. It is located next to the blower motor and is held in by 2 7/32 screws. Replace this and all your problems will go away.

Not sure of the question, seems to be cut off. Ask the question in the body of the post. To test motor, remove the plug, use a fuse protected wire from the battery and one to ground, touch the terminals on the motor, does it worK, if yes, replace the resistor, it's bolted to the blower case next to the blower.

Not real hard.

Hello,

It sounds like you might have a faulty blower motor resistor.
When you turn the fan speed knob, the resistor on the blower motor changes the speed.
Over time the resistors can wear off and go bad, sometimes you might loose one or two speed settings, other times only one speed will work. A lot of times only the full blast will work.
The resistor is mounted at the bottom of the blower motor. To access it you will have to remove the trim pieces under the glove box on the passenger side.

https://www.2carpros.com/articles/blower-fan-motor-works-on-high-speed-only

I have attached the diagrams for your reference.

Please let me know of any questions.
Thank you.

When the problem occurs, I'd check the circuits at the blower relay. The orange wire is only hot for high-speed, voltage goes to coil side of relay. When relay is energized, that line with the arrow head on it, moves to the high-speed blower fuse. When the relay is not energized there is continuity for the lower speeds, blue wire carries voltage for lower speeds.

You could use jumper wires with inline fuse for voltage and ground to blower motor, blower motor should run as long as the wires are hooked up. If it still stops, I suspects a faulty blower motor.