Q: The A/C works only when the fuse has been replaced in order for it to continue to work. What causes this?

asked by on

I have replaced the fuse in my truck often to get the air conditioner to work properly. What is causing the fuse to blow. There is not a problem with the heater working. What can I do to resolve this problem?

My car has 149500 miles.
My car has an automatic transmission.

It is important to know which fuse you are replacing. Is it the fuse to the compressor clutch or to the blower motor to be precise. Either way, I can give you some insight that you can use to figure this out.

Anytime a fuse blows in a fashion such as this, it is an indication there is a problem with the primary component in the circuit. When an electrical device such as an A/C compressor or a fan motor turn on, there is an initial spike in current. As components begin to age, this spike can, but now always, will begin to increase due to a resistance in the system. The resistance can be electrical or mechanical. Both will cause an increase in the amount of current needed to start the device.

Since you said the heater works, but not the A/C, I assume it is the compressor clutch circuit that is blowing the fuse. Which ever circuit it is, the most likely cause of the problem is the compressor clutch or the blower motor under that dash. Before I replaced either of these, I would test the actual current of each device in addition to a visual inspection of both systems. Bad connections will require a higher current for a circuit and a bad connection can occur anywhere in the effected circuit.

If you decide to get this fixed, consider YourMechanic, a a certified technician can service your fuse issue and ensure that everything functions properly. Be sure to send the mechanic a note explaining how the fuse continues to blow intermittently.

Good luck!

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. The A/C works only when the fuse has been replaced in order for it to continue to work. What causes this?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Power steering pump on 2012 Acura TL needs to be replaced. Due to location a power bar also needs to be replaced. Cost over $3,000. Is this a good price?

Question sent to CS for a quote on replacing the power steering motor, programming, and replacing an electrical component attached to the motor. This is in comparison to a quote that was given for the parts and labor.

Q: How do I operate the manual air conditioning system?

If your car is equipped with a manual air conditioning system, it provides you with the means to keep the interior temperature at the right level for you and your passengers with relative ease. Here’s how to use the various...

Q: Cylinder 6 misfire

Hey there. If after replacing all those items, the cylinder #6 misfire code remains, then there are a few other possibilities. This could possibly be a fuel injector fault. The injector can be clogged or simply worn from age and...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.