It is quite possible the blower motor is drawing too much amperage. This is caused by a motor that is wearing out and starting to drag slightly drawing more amps to keep the motor turning. It can also have dirty wire connections at motor causing high amperage draw...
Check the blower motor resistor as it controls the fan speeds. Also check the blower motor as it will burn out resistors if its drawing to much amperage
Larger wires will not reduce the amperage draw of a device. Limiting amperage draw is accomplished by fuses wich blow when the amperage drawn across them exceeds their specifications.
Remove the wiring harness to the heater blower fan. Remove the retaining bolts. Remove the fan from the blower. Reverse the process to install the new heater blower fan.
If the fan turns on, it could be a short to power (two power wires shorted together) causing the increase in amperage. If the fan doesn't turn on, it's probably a short to ground after the switch in the circuit; where power is bypassing the intended path, which is the blower.
More than likely it's a bad fan motor drawing too much amperage.
The blower fan motor is worn out.
Amperage draw, excessive amperage draw, and or dirty & loose connections. This should be checked out if the temperature is elevated when not cranking your engine.
engine fan or heater blower fan?
How do you replace a fan blower resistor on a vauxal Corsa?
the blower fan resistor has gone bad.
Leave the fan on and put a clutch under the fan,than if you have a turbo connect the fan blower to the turbo