I only get the fan to work on high speed, the lower speeds do not work

You are talking about your blower fan for the air conditioner and heater right? More information will be needed to solve the problem.

When you say it barely changes speeds, does that mean it doesnt speed up, or doesnt slow down? By that I mean, is it "stuck" on low, or high?

Most blower fans run at different speeds through the use of a multi-stage resistor built into the fan switch circuit. Low speed is a high value resistor, medium speed is a low value one, and high speed is the fan running without any resistance.

If your fan is running on high and doesnt seem to want to run on lower speeds, the resistor pack may be failing. If the fan is running on low speed only, it may be that the fan itself is beginning to fail, or that the lubricant in it has gotten gummy.

Hello sanjuis24
It sounds like you've got a bad blower motor resistor. The resistor is located under the right side of
the dash at the blower motor. A new resistor is not very expensive and it's a fairly easy DIY.
Hope this is helpful

It is very likely that the blower motor resistor has burned out. The resistor uses several resistors to drop voltage which drops the fan speed. Since high speed requires no drop in resistance it bypasses all the resisitors. Since none of the lower speeds work I would belt that the resistor for the setting just under high speed has burned out out. since all the other lower speeds use that resistor. Sometimes they will also have a non-serviceable internal fuse that will blow.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

ITS THE SPEED RESISTENS THAT HAS BURNED,THE FAN HAS ONLY ONE SPEED , AND THE RESISTENS LOWER THE SPEED IN STEPS , GET A NEW ONE AND IT SHOULD WORK

The high blower works off a relay in the high speed only so the fan switch is at fault on your vehicle
Replace the fan blower control speed switch which is the one you adjust the lower fan speeds

The blower motor resistor pack is defective and must be replaced. The resistor pack controls the variable speeds.

Possible solution is to check the fan speed switch. These go bad and won't change the speed/ or function in the lower speeds.

the switch is on the dash with the other a/c controls. does the fan work at all? high speed OK? but the lower speeds dont work? if any speeds other than high dont work, replace the blower resistor.

Usually when the blower fan only operates on hi speed, its because of a failed blower motor resistor. You still have hi speed because on hi, the power going to the blower motor goes directly to it, as opposed to the lower speeds, when the power is routed through the resistor, thus lowering the voltage, which in turn lowers the speed of the fan. The resistor is usually located near the blower motor itself, under the hood back near the firewall.

there is a resistor for the fan motor which works the lower speeds, you need to replace that, it is normally located near the blower motor, got 3-6 wires plugged in it