Quick Answer: Is It OK To Start Car With AC On?

Is it bad to start your car with AC on?

Dear Car Talk: Actually, no.

It’s not harmful at all, Stanley.

First, cars automatically shut off auxiliary power while the car is cranking.

So when you turn the key to crank the engine and start the car, the AC, the radio and virtually every other electrical device is shut off anyway..

Can a bad battery cause AC not to work?

A weak car battery can cause your auto air conditioner to function poorly or not at all. Car batteries need to have enough voltage to trigger the AC compressor, and while it may be strong enough to run the rest of your car, it may still be too weak to run your car’s air conditioning.

How do I reset my BMW climate control?

Blow warm breath on the interior temperature sensor, climate fan increases. “reset” the car by unplugging battery cables and connecting the disconnected cables together for 10 minutes, no improvement.

Why does car lose power when AC is on?

Your car air conditioner has a small compressor that is driven by the same belt that operates other parts of your car. When you turn on your ac, your car now must take some of its horsepower and share it with the ac compressor. … Car engines lose power and acceleration when the AC is turned on.

Does removing AC add horsepower?

You’ll gain as much horsepower from removing the a/c as you will from just setting the switch to “off”.

How long can a car battery run an air conditioner?

This means that a car battery can run an air conditioner (assuming an inverter is used), but it would like only run less than 10 minutes. Interesting thought experiment, but not very useful in keeping anything cool!

Is it normal for car AC compressor to cycle on and off?

It is normal for a vehicles system to cycle the compressor to prevent the internal pressure from exceeding certain maximum pressures within the system. … If it is working properly, the compressor should stay on for more than 45 seconds and should only switch off briefly before switching back on.

Does putting the AC on waste gas?

Using the AC in your car does lower your car’s fuel efficiency by an average of 3 miles per gallon depending on the age and size of your car. … If you’re driving at high speeds, leaving your windows down can actually lower your fuel efficiency more than using your AC would.

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.

How much horsepower do you lose with AC on?

In general cruising in a car at 70mph takes about 10 horsepower. Automotive air conditioning users about 1 horse. You’ve increased motor load by 10%. So your full economy will drop about 10%.

Is idling with AC on bad?

But setting my environmental preferences aside, you can let any car idle with the AC on for a long time without doing any harm. As long as the cooling system is working properly, you should be able to sit in any modern car you buy and let it idle indefinitely. Or at least until you run out of gas.

How long can I keep my car AC on while my engine is running but car is parked?

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. Assuming a 17 gallon tank and . 17 gallons per hour you can run the car for about 100 hours at idle.

What happens if you leave the car AC on?

Some cars will overheat if you leave them idling with the A/C on. Others are okay because they have enough reserve capacity in their cooling system to handle it. When the A/C is running, it dumps the heat that it just removed from the passenger compartment into the radiator.

Will my car battery die if I leave the AC on?

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.

Why does my AC turn on when I start my car?

There are many reasons an air conditioning unit may automatically switch itself on and off. The most common causes of this problem tend to be the build up of dirt on the compressor or condenser, faults with the thermostat or timer, or issues with the circuit board.

Does AC use battery?

When you turn the AC on in your car, it uses energy supplied to it by the alternator. This energy is coming from the engine, which is using the fuel in your gas tank. … This is the same belt that is responsible for running the alternator and charging your battery.