Originally Posted by John_Kunkel
Originally Posted by SomeCarGuy
You can boost up the fan speed by doing that as the full 12 volts isn’t delivered even on high by the factory setup.


Did that on my '70 Charger and the motor got really hot.


The safe way of boosting the high fan speed would be with the use of a high speed relay in the circuit. This would help reduce the risk of melting the blower wiring.