Skip the auto shop - Our mechanics make house calls

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?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  • Home
  • Questions
  • 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: Parking lights come on and blink without my assistance

The most common problem is the flasher relay in the interior fuel junction box. Try to replace the relay first and if the problem continues then you may have gotten something into the turn signal switch like cleaners or interior...

Q: How do I use the seat heaters?

The front seats have seat heaters that allow your seats to be heated while you drive. The seats are controlled by the heated seat switches, which are on the center console. Press the LO button on the switch to heat...

Q: Check engine light is on and obdII said O2 sensor. 2002 Chevy Silverado 1500

Hi there - some problem codes require a certain number of "drive cycles" before the ECU will turn off a Check Engine problem code, O2 sensors often being one of them. If your truck is running well, ignore the light...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...