Feels like heat is coming out but the fan wont turn on nor with AC. started happening last winter, heat would go out for a day then turn back on. Finally its done for good. Not sure where I should start, or what the common issues are for replacing the few parts it could be. Dont know if this is significant to add but when I start the car i hear the vents open to the defrost mode, and over about 20 minutes there are 2 tiny defrosted circles on the front windshield. Dont know if this still indicates still working, or if its just engine heat.

checked all the fuzes and they seem fine. was going to try to replace the fan switch and/ or the AC heater fan speed resistor. could also be blower motor.

let me know if there is anything else I could test or check and what you guys think I should start replacing first.

thanks for your time!