Is it true that you should not start your car with the AC on and if so why?

In short, no, you do not have to turn your air conditioning off before turning off your vehicle. That being said, it never hurts to disable electrical systems, including the fan, before switching off the ignition.

1. Is it bad to start your car with AC on?
2. Is turning AC on and off bad in car?
3. Should I switch off AC before starting car?
4. Is it bad to turn your car off with AC on high?
5. How long can you leave your car running with the AC on?
6. Does turning off AC make car faster?
7. When should I turn my AC on in my car?
8. Is it bad to idle your car?
9. Can AC drain car battery?
10. Is it bad to let your car idle for 30 minutes?

Is it bad to start your car with AC on?

In modern cars - it does not matter. The A/C is automatically disconnected via the compressor clutch. It could be an issue on older cars with a weak battery as it will put more load on the battery. However if your battery is ok you should be ok.

Is turning AC on and off bad in car?

Whenever you press the AC switch in your car, A relay is energized and it actuates a solenoid which then engages the compressor clutch to pulley. So whenever you switch off the engine, the relay de-energizes and disengages the compressor clutch. So there is no harm in switching off the engine while AC is on.

Should I switch off AC before starting car?

The power is directed towards the starter and the battery is available to supply the power to the other components soon after. So, if you switch off or on the AC of your car while starting the engine, it will not affect anything in the car. However, if you own an old vehicle, it is a good idea to do so.

Is it bad to turn your car off with AC on high?

But the answer is no, not necessarily. The system is 'balanced' by the high and low pressure sides through the various valving in the AC system, and turning off the car is like the compressor just kicking off as it does continually while you drive.

How long can you leave your car running with the AC on?

In a modern car properly designed with sufficient cooling system, almost indefinitely. The engine should be able to idle and power the air conditioning and not overheat, even on a hot day in a tropical climate. Eventually you will run out of fuel and that will be the limit.

Does turning off AC make car faster?

RAY: Yes it does, and no you won't. It does provide a power boost, and it does not harm the car.

When should I turn my AC on in my car?

* Switch on the AC only after starting the engine. Likewise, shut down the engine after switching off the AC. * If the car is parked under the sun, do not switch on the AC immediately. Open all the doors and let off the hot air accumulated inside.

Is it bad to idle your car?

Although idling your engine is not necessarily harmful, it's also not something you should try to do excessively. ... To avoid running your car for too long, you should only idle your vehicle for a few minutes at most before either moving your vehicle or turning the engine off.

Can AC drain car battery?

If you run the AC when the car is off, it not only puts a strain on the battery, it can completely drain it. Now, if the car is running, and barring no issues ( bad alternator etc), it puts a load on the battery, but the alternator is able to keep up with the demand.

Is it bad to let your car idle for 30 minutes?

Most idling periods are short and while limited power is available to all systems they should all run satisfactorily without concern, including the AC. However, repeated, extended periods of idling IS harmful to any engine, regardless of whether AC is on or off.