My car AC stopped cooling. it started working again after I refilled the gas but stopped working less than 24 hours after. So I suspect there is a leakage somewhere on the Evaporator

May need to change the orifice valve, or if you mean the compressor cycles on and off, pressure switch is likely culprit.

to convert from r12 to r 134 a the entire system has to be changed
that is condensor, compressor, evaporator, hoses ,the lot because r134a runs at much higher pressures than r12 ( nearly 3 times higher in psi)
it needs different gauges and has different fill connections so that the gasses cannot be mixed
to make it worse the oil used in the compressor is different because of the different gas and is not compatible with the r12
there was nothing wrong with r12 gas but companies and customers were "hoodwinked" into believing that the r12 was bad for the atmosphere and r134a was the answer
just as you have been " hoodwinked" by the person into getting a gas change over without being fully informed of what was involved and why
with r134a gas there has to be a fan in front of the condenser that works immediately the ac is switched on as the temp of the gas being converted back to liquid is much higher because of the higher pressure need to convert it back from gas to liquid
without that fan the system starts to circulate gas and so the evaporation of the liquid at the evaporator in the car is lost and no heat from the car is transferred back outside
what it means is this --- if you can get r12 gas , change the compressor back to an r12 compressor, have the system completely flushed, vacuumed down for at least 1/2 hour and then refill with r12
If on the other hand you have to use r134a because that is the only compatible compressor available then the evaporator , hoses and condenser have to be changed as well and that means a new ac kit basically
find yourself an accredited ac specialist shops and get quotes

use the appropiate machine to empty the gas from system then check the switch then refill and check again should be the opposite function although i suspect lack of gas by weight as this will stop the pump from coming on .All modern R134 AC systems are extremely dangerous to diagnose and play around with and can result in serious injury so i strongly suggest you take vehicle to certified technician

Interesting question. The AC condensor is in front of the radiator, and the movement of the car (or the fan) cools the refrigerant.

This is not working normally. I'd suspect
a) the refrigerant level is low (ie a slow leak), fix is refilling it.
b) the compressor stops working at higher rpm. Various issues can cause this.

Have the system pressure checked at an AC shop. One QUICK and dirty way is to take off the AC hose HI pressure cap. Press the valve BRIEFLY. If you hear a sharp, loud noise of escaping pressure, the level is probably OK. If you hear a soft hissing sound, the pressure is low, and the refigerant has to be refilled.

SD

Sounds like either you have a clogged fuel line and or clogged fuel filter or the fuel pump is failing. What happens when the vehicle runs the fuel pump heats up, as it heats up it produces less and less fuel for your car. Eventually ti stops working until its cool again on faulty pumps. Given the age of your vehicle I would say you need to replace both pump and filter.

Well then, the solution is to determine what is causing the poor circulation of the gas... right?
Well now, there's the compressor, the condensor, the hoses, the expansion valve and the evaporator in the system. Find out which one(s) and replace it(them).

it will be more seals or a very hard to find leak in the evaporator core or condensor

the gas from the car AC must be leaking tru refilling the gas and it would be fine again.

Your fuel pump is sticking and not pumping, this is common if you run the fuel down to less than 1/4 full, the fuel pump needs the gas to cool itself, below a 1/4 tank the pump is not getting cooled and after repeatably running low on fuel it overheats and fails. Running the car near 1/2 tank extends the pump life to many years more than running tank below a 1/4 full..

Dear Customer,

If ther is 0% cool than defionately problem with gas tank which had work for coolent ,so try to refil gas at your car ac branded showroom service center,

your prom will 101% fixed up,

try this,but if compressor runinig than,

ok,



THNX