Skip the auto shop - Our mechanics make house calls

Q: I just changed the battery and alternator. Now my air conditioner is blowing hot. What can I do?

asked by on

I just finished changing my battery and my alternator and now my air conditioner is blowing hot air I do not know why it is but I would like to find out what I can do to fix it

My car has 50000 miles.
My car has an automatic transmission.

Hello. If you recently serviced the electrical system and now your AC is no longer working then it may be possible that the issue is related to the work. The first thing I would do is check the vehicle’s fuses and relays. It may be possible that one of the fuses or relays blew when the battery or alternator were disconnected. This does not always necessarily indicate a major issue, but can be the result of one if a fuse continues to burn out repeatedly. If one of the fuses related to the the AC system has burned out it can cause the system to malfunction. I would also check the vehicle’s interior fuse box, as there may be fuses related to the AC located there as well. If the fuses and relays are all good then it may be possible that there is an issue with the AC system. Hot air can be caused by many things, ranging from low refrigerant in the system, to a faulty sensor or switch. A proper diagnosis of your air conditioning system by a professional technician would be required to determine what the exact cause may be.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. I just changed the battery and alternator. Now my air conditioner is blowing hot. What can I do?

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: Shifting problem?

What you are describing may be a result of a faulty speed sensor, potentially low transmission fluid or a even a faulty transmission control solenoid. As your vehicle travels down the road, the computer analyzes data being sent by vehicle...

Q: computer will not talk to altenator 2011 vw routan

Hi there. Each mechanical and electrical system in today's vehicles are monitored and in many ways, controlled by a series of sensors and electrical connections that send and receive data from the ECU in order to work effectively. The alternator...

Q: Diesel truck broke down. No steering or brakes.

I believe that the towing company is correct. Heavy duty trucks get their power brakes hydraulically instead of a vacuum booster like passenger cars. Heavy duty trucks actually get their assist from the power steering pump fluid. So, if your...

Related articles

What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
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.