Low side no fitting can it be charged on high side

Danger! Always connect the charge fitting to the low side of the system and use the proper refrigerant. All low side fittings have been the same since around 1993. It looks like you are trying to apply the charge to the high side of the system. THIS CAN CAUSE THE CAN TO EXPLODE. Find the low side charge fitting. The low side will have a wider hose or tubing. A 134A charge kit will have the proper fitting to fit your car. The fitting might be hidden but when you find it the charge connector will fit on it.I recommend you use a charge kit with a pressure gauge. On a hot day it should read about 30-40 psi

I'm a little lost here.
You normally get the high and low fittings when you buy a kit. The original system had the same size fitting for both, but the kit comes with two different sizes for R134 gauges. You may have to look for the high side fitting by itself.
How do you know the evap is leaking, or is that just a guess ?
As long as the high side fitting is closed, you should be able to charge the low side but you won't know when it is full without the high side gauge.
I would try to find the high side adapter and get the gauges hooked up before you proceed.

the low side line is the one you want to use to charge the a/c. The low side fitting is always on the larger line and is always the smaller fitting. The high side fitting is larger and always on the smaller line. They make the fittings two different sizes so that you can not place a low side connector on the high side fitting.

Make sure the vehicle is running and the a/c is on before you start to fill the system.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

The low side port is always the smaller fitting on the larger line. The high side is always the larger fitting on the smaller line. They do this so that the low side fitting can not be mixed up and placed on a high side port.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Find the air compressor located on the engine and follow the two metal tubes coming out of it. One tube is the high side and the other is the low side. Keep following them until you find a tee with a plastic cap. The red cap is the high side, the blue cap is the low side. If you're trying to re-charge the AC then the recharge fitting will only go on the low side, it won't fit the high side on purpose.

The low side port. If you have the proper quick connect charging hose, it will only fit the low side fitting. The high side fitting is larger & wont fit the quick connect fitting on the hose.

Find the a/c compr, look for the thick a/c line, follow the line will come to an a/c port to charge a/c, stay away from thin a/c line that one is high pressure, low side a/c hose adaptor will only go on low side fitting, will not fit on high side.

find the compressor it runs off the belt then locate the two lines
there is a high side and a low side there should be caps over the fittings you must charge the low side
to find the low side the lines run by the rad in on side and out the other it runs in on the high and exits on the low
the fitting should only fit on the low side on most vehicles or they could be color coated red and blue blue is the low side
check out you tube for some videos on how to

Ther are two fittings in the system, the low and high sides. You want to charge through the low side. Following the line from the firewall(right side) on the Aluminum expose pipi there should be a fitting. The fitting is larger than the high pressure side and cannot be mistaken. The high pressure lfitting is smaller and on a small steel line coming from the condensor in front of the radiator. Both are accessible working from top of engine.

the charging system can only fit on the low side. It can not fit on the high side so just look at the 2 different sizes.