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bigchief3679 wrote:^^^ it is sad but true. many AC guys don't have half a clue about what they are doing and the proper theory behind thier chosen field. they would just keep changing parts until by process of elimination the problem may go away.
to the OP, a little research may give you a better idea of what must be done to convert from R12 to R134a and hopefully reveal the weakpoint of your existing system.
Papajohn wrote:And I think the OP should check another AC technician also... some of the techs also do stuff just to keep making more money
x2 been by a couple of ac technician and they still couldnt determine my problem
most of them jus rippin of people,and prices are ridulous
who u guys recommend to be the best of the best,cause i spents enough $ and my ac hasnt been performing to its full potiential yet.
classycars wrote:First of all R12 cools just as well as any , if you have a system that runs on the old gas then its just a matter of changing the oil.
How an AC system works is , gas is stored in the entire system, then the compressor pumps it through the condensor (for cooling) then the dryer and then the expansion valve.
Reasons for hissing sound from vents are as follows , 1. Bad dryer 2. Too much oil in the compressor(this can affect cooling even though the system seems fully gassed) and last but not least the expansion valve.
We have to always remember for R12 or any other Refrigerant to works is that it has to return to a liquid state , for this to happen it has to be cooled and as such this is where your condensor comes in , if your cooling fans are not working as they should then you have a mixture of gas and liquid reaching your evaporator, this will cause a hissing of bubbling sound . an easy way to check this is to use water on the condensor then check for changes in Temp.
The compressor..... this the heart of your system , this is also the first to blame when having problems, here is the good news ..... a compressor can be checked to know if faulty, here is a few ideas how it is done , 1. pressure testing using nitro 2. placing a gauge on the low side and at idle speed of engine you should be getting between -40 to -50 psi then when you turn off your engine it should drop back slowly and not drastically ...
Once again hope that my info was usefull in some little way .
As always people , avoid the quacks .....
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