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How does freon work?

Updated: 11/10/2022
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13y ago

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Lecture: (the answer you are looking for is below)

Freon is no longer freon it is now known as refrigerant, the original Freon hasn't been in use for decades. Freon was a brand name.

Refrigerant cycle:So we have a pure gas, at room temperature and pressure a gas.

If we compress the gas we get a hot gas that occupies less space.

We then cool the hot gas and this turns the gas into a liquid. We use a "condenser" (special high pressure radiator on a car or air conditioner) to do this.

Then the cool high pressure liquid goes to one of two types of "expansion" devices:

  1. Most AC systems (not all) use a pilot tube or orifice
  2. Some Dodge cars and trucks as well as large buses etc use a specialised expansion valve

These two devices both spray the cool liquid into a evaporator ( a special radiator again) that is maintained at low pressure, this causes the liquid to boil and vaporise. Making the evaporator very cold.

The refrigerant gets warmed by what ever we are trying to cool (EG: the air inside of your car)

Once the gas is warm it travels back to the compressor to start over again

Other uses:Basically this heat pump technology is used on refrigerators, AC systems of all sizes, heat and cool heat pump systems, Highway truck refrigerated trailers, The space shuttle and so many more.
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Do you add coolant or freon to make a cars air conditioner work?

you use freon to cool your car and make the air conditioner work


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A refrigerant (freon) is required for an A/C system to cool. Therefore, no, the A/C should not work is the freon is removed.


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No, you have to call a repair man to come do it for you, unless you have to have a licences to work with freon.


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Mine is out of Freon.


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one reason maybe that your low on freon


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try first with freon


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No problems. Your AC will just work a little better.


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