A fuse blows when there is a short circuit or an overload in the circuit.
If a fuse blows you probably have a short or the circuit is overloaded.
You have a short somewhere in that circuit if the fuse blows soon after replacing it check the condition of the wires in that circuit
A fuse blows when the circuit is drawing too much current. It could be a short or an overload.
When a fuse blows, it essentialy breaks the circuit. So the current can no longer flow, this is used as a safety measure.
You have a short in the circuit somewhere.
You have a short circuit that keeps blowing the fuse. Find and repair the short before putting a in new fuse.
A blowing fuse is an indication that there is a short circuit condition in that circuit. A short circuit condition is the result of a "hot" wire or component in a circuit coming into contact with another wire or component which is "grounded." Grounded means that a metallic component is somewhere connected to the ground post [terminal] on the battery.
A circuit that keeps blowing a fuse, is caused by a Short in that circuit, loose connections causing arching, overloaded circuit, or a fuse that is too small for the circuit load. Do not install a fuse bigger than the circuit was designed to handle. Someone may have install too small a fuse. Check fuse list and see if the proper fuse is installed.
A circuit breaker shuts down and can be reset. (A fuse does not "shutdown", it fails, or blows, or breaks and cannot be reused.)
A fuse blows when the current draw of the circuit is greater than the capacity of the fuse.
this is because you have a short in either the the ac circuit or the fan/blower circuit. You'll know know which one by turning the fan on without the ac, and if it doesn't blow the fuse then you know it's the ac circuit.