Q: Aircon makes car battery flat

asked by on

My son bought this car second hand $500, whenever he runs the aircon when he's driving, after he turns the car off the car won't start again. What do you think the problem could be?
My car has an automatic transmission.

Hi there. From the description you have provided, the alternator may not be keeping up with additional load of the air conditioning system. This could be the result of, a loose/worn drive belt or a faulty voltage regulator which is integral of the alternator. Proper diagnoses should be performed to avoid unnecessary repairs. I recommend having your vehicle’s a/c causes the battery to die be diagnosed and repaired by a certified technician, such as one from YourMechanic.

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. Aircon makes car battery flat

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: After hitting a big puddle, car has whirring/grating noise in front of car. Also driver seat belt buckle won't pull out when cold

The seat belt retractor should be replaced as an assembly. It can be checked for obvious, and repairable faults, but generally an item like that which is safety related is not worth taking a risk over. Water can exert lots...

Q: Q: Issue with power steering

Hello. The leak is what needs to be identified and repaired. If the fluid is coming out, then the vehicle will not have any power assist. Most of the time, a serious leak like this comes from one of the...

Q: I have a severe engine coolant leak

Hello, the overheating issue needs to be fix as soon as possible, the vehicle should not be operated or you can damage the engine. An overall inspection of coolant system components needs to be done. Some visuals may have to...

Related articles

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...