In the above posts you can see the pics of the equipment that were used in the work
Following is the cost of the equipments
Gauge set and the 3 charging hoses Rs 800
The two meter charging hose (black) Rs 150
Teflon Tape Rs 15
Thermometer Rs 200
Gas can tap Rs 120
Compressor Borrowed from a fridge/AC repair shop
Gas R134a 500gm Blue Star can for Rs 300
250gm compressor oil for 180 (only 30cc used) as I replaced the drier bottle.
O rings (buy R134 compatible o rings)
The gas can
The compressor (Note the pipe is connected to vacuum side) Never ever
fill air in the AC system
Notice the difference between the old and new oil
System being vaccumed The Precautions and Procedure
First the Precautions:
1. Wear safety Glasses and Gloves.
2. Keep a cotton cloth to wipe off your hands when they come in contact with the compressor oil.
3. Have someone near to shut off the engine in case of emergency
Now the procedure (This is for a completely empty system)
Connect both the low and high pressure hoses and close both valves on the manifold
Connect the center black hose to the vacuum side of the compressor and turn it on and open both the valves on the gauge
Let the system evacuate for half an our to -30 in the low pressure dial and below 0 in high pressure dial 45 minutes would be better
then close the valves and shut off the compressor.
Let it stand like this for a minimum of 45 minutes. During this process turn on the car and accelerate To check it the vacuum breaks due to vibration (DO NOT TURN ON AC AT THIS TIME)
the more time you keep in vacuum the better the testing of leaks
After the leak testing now its time to fill the gas
Disconnect the center hose from compressor and connect it to the gas can via the tap
Open the tap and let gas fill the hose
now bleed the hose by loosening the center valve near manifold a little. tighten it as soon as you hear a hiss.
open the gas can valve fully and open both the valves
The vacuum inside the system will suck 10-15% of gas. Then shut off the high pressure valve fully and start the car and turn on the AC. do not invert the gas can.
as the gas starts going in the system the can will start freezing Put it in a small bucket of water so that the temperature will normalize.
As the gas keeps flowing put the thermometer in the center hose and check the temperature Fill the gas according to pressure and requirement. (Different cars have different pressure and gas requirement)
My setup requires 630 gm and I have filled 500gm so the cooling will be 1 degree less
But I'm totally satisfied with the temp output