Just to be clear, when you turn the blower on, either A/C or heater the fan does not come on?
When you say it sounds like it wants to come on, can you clarify that a little more?
If you are hearing the motor buzz the I suspect the blower motor has failed.
https://www.2carpros.com/articles/blower-fan-motor-works-on-high-speed-only
https://www.2carpros.com/articles/low-or-no-air-flow-from-vents
Basically what we need to do is check for power at the blower motor. If it has power then you need a blower motor.
Please let me know what you find with this. Below is the wiring diagram that will help with this. Thanks
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Friday, June 18th, 2021 AT 7:37 PM