AC/heat fan stopped working

I bought this car used in the winter. The heat was working fine but slowly it became more difficult to get it to come on by turning the fan knob. Come spring the air conditioning was working great very cold lots of air coming through the vents all the sudden the fan speed knob only worked on low until it eventually stopped working. The AC button only lit up green sometimes now it does not light up at all. The other day I turned it on and it worked for like ten minutes then it just cut off now nothing. I changed the resistor and I changed the climate control module in the dash. Same problem fan speed knob doesn't work the re-circulation button lights up but not the AC button does not. I switched the relay with the horn to check the relay that was not it. I am at my wit's end trying to figure out what is causing this not to work. If anybody could help me I would appreciate it. I am trying to avoid the high cost of going to Toyota. Also, my friend checked the blower motor and it started running. Thanks