What temp should my car AC be?

Simply drive your car with the A/C on maximum. As an example with temperatures in the 20’s Celsius (70 to 80 degrees Fahrenheit) the outlet temperature should be around 1-8 Celsius (35 to 48 degrees Fahrenheit).

What temperature should my car AC be blowing?

In general, with ambient air temperatures 70 degrees Fahrenheit and humidity 20 %, the evaporator outlet air temperature should be in the 35-40 degrees Fahrenheit range.

What should car AC be set?

Use the coldest setting

Consumer Reports recommends setting your car A/C at the lowest temperature and then adjusting your fan as needed. As a result, your A/C should work more efficiently and also save you some fuel.

Is it OK to start car with AC on?

Starting your car with the AC on is perfectly fine. You cannot turn on the air conditioning without the engine running. The compressor for the air conditioning gets it’s drive from the engine and hence it will only work when the engine is running. However you can turn on the blower which is electrically driven.

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How cold can R134a get?

It depends on the type of application, Freons like R134a has freezing point of up to -103°C and in most refrigeration purposes the user set temperature won’t be below -15°C .

What makes car AC colder?

The heart of any air conditioning system is a compressor whose job it is to compress the freon. When the freon later expands, it gets very cold. Air blown across metal filled with cold freon causes the air to cool quickly.

How can I make my car air con colder?

To re-circulate, or not to re-circulate

When you first get back into your car, you can use the recirculation option on your car’s air-con to cool the cabin down. This makes it much easier for the system too cool the air quickly, as it continues to work on the cooler air inside the car.

Should you turn off AC before starting car?

Yes of course you should turn off your AC before or after turning the ignition key of your car. The reason behind it is the compressor of AC runs by consuming the power from engine. Thus when the engine is started it requires to produce more power if the AC is on, thus resulting in more fuel consumption.

Why is leaving your AC on bad for your car?

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.

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How long can you leave a 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.

Why does my car shake with the AC on?

When you turn the AC on, the vehicle engine triggers elements such as idle speed or air control motor. You can increase the idle compressor by compensating with an additional drag. The inaccuracy in this process causes the vehicle to shake when AC is on.

Why does R12 cool better than R134a?

Understand that R12 has its advantages. R12 can blow 6 to 7 degrees cooler than R134a and is 15% more efficient. R134a systems require larger condensers and higher operating pressures than R12 systems because R134a doesn’t have as high of a heat transfer rate as R12 (which has a heavier molecular size than R134a).

What happens if you put too much Freon in your car?

Rough Idle or Stalling on a Car

The air compressor for the A/C unit may not operate correctly when the system is overfilled with refrigerant. This can actually cause the car itself to run roughly or even die in some cases.

What should my gauges read on R134a?

It can be used for recharging refrigerant, or to diagnose an a/c system based on pressure readings from your gauges.

R134a Pressure Gauge Chart.

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Ambient Temperature (°F) Low Side High Side
80° 45-50 psi 175-220 psi
75° 40-45 psi 150-175 psi
70° 35-40 psi 140-165 psi
65° 25-35 psi 135-155 psi