Adding Freon to your automobile's Air Condtioning system

Step 2 Familiarization with your cars freon system.

First see what freon your vehicle uses. There should be a tag on the radiator cover cowl or somewhere under the hood that tells you. Look for 134A. If it says 12 this Instructable does not apply to you. There are conversion kits but that is beyond the scope of this demonstration. Now check out the pictures to see what the basic parts of an AC system are. Note that there are parts you can't see and we won't address those as they are not necessary to know about to charge the system .
The basic AC system has a pump or compressor that pumps a low pressure gas to a high pressure. That is why it is called a compressor. Next the high pressure gas goes to a condenser that sits infront of your radiator. You might of noticed your fan runs a lot when the air conditioning is on. That is so cool air is pulled through the condenser to cool the hot compressed freon. Next a wonderful thing takes place. The hot freon after being cooled turns from a hot gas to a semi hot liquid. Trust me on this. The liquid is still at high pressure and very warm and stays that way until it is used to make the evaporator cold.
Once it travels into the evaporator it is now a low pressure cold gas again and not a liquid. It then leaves the evaporator and goes through hoses to the accumulator / drier which is just a big tank to catch any liquid that might of snuck out with the gas. Then from there the low pressure cold gas goes back into the compressor to start the cycle all over again. You may of noticed the system has a high pressure side and a low pressure side-VERY IMPORTANT. You will only work on the LOW PRESSURE SIDE. The freon is added on the LOW PRESSURE SIDE ONLY. The hose tool you bought is made so you can only hook to the low side as the high side and low side fittings are different sizes and shapes for SAFETY'S SAKE.