Car Ac Fuse Keeps Blowing – A Warning Sign For Everyone!

We all hate it when our vehicle doesn’t start. Having your car AC stop working at the wrong time is simply bad luck. However, if you notice that your fuse keeps blowing, then you might have a more severe problem at hand. 

On the other hand, never attempt to fix this yourself, as you might cause more damage in the process. Here are some of the common reasons why car ac fuse keeps blowing. Let’s check it out!

4 Common Causes Why Your Car Ac Fuse Keeps Blowing

Too low a fuse amp rating

A fuse’s role is to safeguard your automobile’s wiring. It is rated according to how many amps it can handle before breaking. 

A high amp fuse will protect against an overload caused by many electrical components in your car. In contrast, a low amp fuse can break after only using one device. 

You may determine fuse’s amp rating in 2 options:

  • Color coding
  • Amp number

Short in a wires system

Chafing & moisture contamination are two common reasons for shortening a vehicle’s electrical system. 

  1. Chafing

It occurs when circuit power wires rub against some metal bodywork, thus exposing the copper wire to the chassis, causing the insulation to rub off. Also, chafing can happen between a ground wire and a power source. When they rub against each other, a fuse is blown.

The powerplant and metal chassis are connected to the circuit in an automobile. This creates a circuit with the vehicle body. 

When touching the electrical power connections away from the body while in contact with a ground-connected part reduces voltage drop due to a shortcut connection. In other words, it provides a shortcut to the battery.

In some cases, chafing can occur due to wire vibrations caused by vehicle aging. It makes wires droop over the years and abrade against parts like the chassis or engine. Furthermore, if you forget to tie looms after repairs might cause problems.

A lot of wire short problems, and chafing isn’t always to fault. Here are a few instances in which chafing is not the primary cause:

  • Accessories damage: Accidental fastening of accessories caused a power wire to be trapped against the vehicle.
  • Mice damage: This animal prefers to chew wire insulation, which frequently leads to a short circuit.
  • Trapped power wire: During cylinder head repair, a power wire became stuck behind a header.
  • Power cable melted: Hot exhaust can cause cables to burn through, resulting in a short.
  • Aftermarket alarm: Wiring connections that degrade over time.
  1. Moisture contamination

Moisture is an automobile killer. Most people associate it with rust, and they are partially correct. Besides, electrical damage is more likely to kill an automobile than rust.

When a motor vehicle leaks water unnoticed or is not repaired, strange things begin to happen. Then, electrical components begin to act independently. That is the first sign of moisture in switches and modules. 

When your electrical system gets water inside it, this water can flow through the system to the ground, blow a fuse and cause a short.

Failed component

For a circuit to be complete, it needs a load. A load is any component of the energy source that isn’t producing energy and instead is making use of it. Some loads require a high current to operate efficiently. And this demand for current could overload your circuitry, causing interference.

There are several causes why motors fail, but most commonly, they fail due to one of three factors:

  • A short circuit: When a component uses more power than intended, a fuse can blow.
  • An open: a hole in the wiring
  • Mechanical failure: Motors utilize bearings to operate freely. So a seized bearing can result in excessive amp demand.

Still, it isn’t always easy to tell which components inside the circuit board may be causing the fuses to blow if they have functioned without any problems.

Overload in the circuit

Overload occurs when the progress of a healthy motor is hampered by a physical limitation.

Imagine a moving component constraint, such as snowfall on the windshield. When the motor encounters this limitation, it demands more power to remove the snow, consuming more amps on the circuit and blowing a fuse.


If your car’s ac fuse blows, you may think you have to replace a fuse linked to the ac, but you may be wrong. Overall, the car ac fuse keeps blowing for various reasons.

Hopefully, the top four common reasons we mentioned above are helpful for you! Besides, take your car to a mechanic if you are unsure what the problem is.

About the Author:

Bryan Mark is the founder of Bryan’s Garage. He owns a small garage in IOWA town, and spend a lot of time on study all techniques both hardware and software of car. His mission is contributing the best car knowledge and experience to the automotive community. It is the most meaningful way to express his passion.

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Brenda Coles
I'm an elementary school teacher who became a stay-at-home mother when my first child was born. I love to write about lifestyle, education, and news-related topics.