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: Transmission slips out of fifth gear

Hi there, thanks for writing in about your 1993 Mazda MX-6. It sounds like a mis-adjusted shifter linkage or a worn shift fork for 5th gear. Either or both of these could cause the 5th gear to not stay engaged...

Q: I have a 1999 Mazda 626.Today while heading to work the car lights shut off, the windows wouldn’t roll up and the car shutdown

You should have the charging system checked to see if the alternator has failed.

Q: Why does my rpm rev up but the car doesn't accelerate

Hello there, many faults will cause your RPMs to increase but the car not to accelerate. This is called a slipping clutch and happens when power is applied when in gear. There are several causes for a slipping clutch; the...

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...
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...
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.