SOURCE: freon leak
If your going to attempt this yourself then you need a few things.
Go to your local car parts shop. You will need a Toyota Corrola Manual in order to find the connector on the low pressure side of your AC compressor.
You will need to find this connector first to determine if the connector is a screw fit or a quick release push fit. You also need to work out what refrigerant to add to your car - R22 or R134a. R134a is more environmentally safe ( the numbers are from memory so may be slightly different but buy the manual and check that first for the type of refrigerant used in your model).
You also need to look for a Recharge can with Stop leak and Leak detector in it - they will have it at the auto shop should be under $20 (you may wish to buy two cans just in case as often one isn't enough) - and once you know the type of fitting you need to use you need to by the recharge connector that will fit on the low pressure side and attach to the top of the recharge can.
Typically the leak detector can be a red dye that can be seen by the eye or a yellow dye that glows under untraviolet light - so if you don't have an ultra violet light source its going to be difficult to see the leak with the yellow stuff . The other problem you may have is if the leak is really bad the system may need to be fixed (stop the leak) and the evacualted for the AC unit to really become effective.
Anyway the practice is to find the recharge connection on the low pressure line. Take the cap off.
Connect the recharge hose you bought to the recharge can. This end of the hose has a tap and spike arrangement that is going to puncture the top of the can but you make sure the tap is fully wound out (away from the can) when you fit it initially. Later in the process you are going to wind the pin in to puncture the can once its all set up. So with the can connnected to that end of the hose you have to fit the other end of the hose to the low pressure side of the AC line on the Corrola. Do that as quickly as possible - if its a push fit with locking ring the action of you pushing the connector on does two things opens the AC system and seals the tube connector onto the Low pressure side. Its inportant to do this as fast as possible to prevent any refidgerant that may be in the system from leaking out and to prevent contaminants getting into the system.
Start the car.
Put the AC on full
Go back to the engine and wind the spike into the can fully to puncture the can it and then wind the spike back out again to allow the refrigerant to enter the AC system.
The can should get pretty cold even to the point of icing a little.
Go back in the car and with the AC system on full and the blower turned on to say the 2nd fan position check for cooler air starting to come through the vents in the car.
You should be able to go back round to the engine after say 5 mins and check that the recharge can is now empty.
Screw the spike back into the can - turn the AC and the engine off and disconnect the low pressure side connector on the hose. If its a push fit it has a brash ring you have to pull up to release the tube and then pull the tube off the system.
You can repeat the process with the 2nd can if needed now.
Screw the protective cap back on once you have completed all recharging.
Now two things to check - where are any signs of red dye coming out of the AC system and 2nd does the AC actually work.
If the AC still doesn't work it may just be that you have such a drastic leak that the system needs to be fixed - e.i. a condenser unit replaced or something and now you are into $100s to fix it.
Good luck.
SOURCE: My 1994 Lincoln Town Car keeps loosing freon but I
A good way is to have the system charged with freon and A/C dye which will glow a bright green/yellow at the source of the leak.
If no leak evidence under hood after this check then the A/C evaporator coil under the dash is the likely source of leak.
Sometimes the schrader valves (ports where the system is charged) can develop a leak. You could put a few drops of water in the valve and see if any bubbles appear.
SOURCE: detecting a freon leak
There is a dye that is made just for that. Charge the system, per directions, and check for leaks using an ultraviolet light. Product is sold at auto parts supply stores, not sure if available at dicount stores.
SOURCE: freon leak
based on the what you posted (,not being a wise guy) you have a leak. check all connections of the a/c system. you can get a spray bottle of soapy water and spray on alll conections to look for a leak spray on lines too.if you find it ,and can slow it to a small leak they do sell a product for small lleaks
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