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Do you hear compresser start up noise. If so then please check it with a clamp meter and Amperage the Unit is drwing. If it is less than 8-9 Amps than there is some leakage in the AC and all the collent has leaked. So you got to get it serviced.
ac leaks are found by vacuum down the system and seeing how long the vacuum holds for
,mechanics are seldom qualified to check a system and if they rely on sensors to do the fault finding will not find slow leaks such as compressor seal leaks or connections leaks
leak detection dye and appropriate colored lens in glasses and using an ultra violet light will reveal a leak better
to test for gas , use a proper gas manifold gauge using 2 gauges --one measures the low pressure side to check for blockages and the other to measure low gas pressures or blockages causing high pressures
The most common cause of your lack of cooling is no or low refrigerant charge in the system, in most cases this is due to the front shaft seal of the AC compressor on the engine leaking, if it is leaking you will see oil deposited around the front of the compressor behind the drive pulley magnetic clutch. Of course there are other places that leak and other problems that cause lack of cooling, but check for a lost charge due to leakage first.
1) Check the compressor working or not.. Air cooling type condenser fan may be not working properly.
2) Compressor working but not properly. Last side of condenser (Filter) Light Heat or not. 3) Inside Cooling area do not get cooling. may be gas leakage problem. 4) My opinion check Gas pressure Low and high side.
Your technicians are not properly locating the source of leak and repairing it before adding more refrigerant. Have them use a leak detector(sniffer) or colored dye that will reveal the leak. Then repair and fill to specs.
A refill of a slow leak will work until refrigerant it leaks out again.
ask him if he remove the condenser prior to install the new radiator? have your system check for refrigerant level, if it is low, then it could have leaked out, or it was removed and not properly charged after installing the radiator, or they could have touched on the lines of the ac that made it leak some gas.