I'm pretty sure it is behind the glove box, so remove the plastic from under the glove box take the bolts out and so on
Your blower motor is going out. Be prepared to replace it soon or it will just quit working all together.
The heater fan is under a panel under the glove box- unclip this panel and the heater fan is right there
Replace heater motor resistor.
Remove the wiring harness from the back of your heater fan motor. Remove the heater fan motor retaining bolts. Remove the fan from the front of the heater motor. Reverse the process to install your new heater motor.
To replace the heater motor in a Fiat Punto, first disconnect the battery and remove the dashboard trim to access the heater assembly. Unscrew the bolts securing the heater motor and disconnect the electrical connector. Remove the old motor and replace it with the new one, ensuring it is securely fastened. Reassemble the dashboard and reconnect the battery to complete the installation.
Continental/VDO New A/C Heater Blower Motor PM4820
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Some of these models had problems with the switch itself; You may want to replace it.
Defective blower motor resistor pack.