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Discussion Starter #1
Hi folks, I had problems with my ac and have reviewed it with a specialized ac workshop. They replace my compressor clutch and magnet, further replace my accesories belt and belt tensioner, after that they filled the system and it was working perfectly but after a couple of days, it stoped working and after a review they found the high pressure on the system was higher than the pressure they charged initially. They remove all the gas from the system and reload it, and the ac system was working with 35PSI on the low pressure and 200PSI on the high pressure, but after a couple of days, again the high pressure raise to 500PSI or more....so they decide to clean all the system, remove the compressor, clean its interior, remove all the oil from the compressor, they pressurize the line and inject freon gas on the system to clean it.. they change the filter bag that is in a side of the condenser, they cleaned EVERYTHING..... and reload the system, that was working PERFECT, at 35PSI on low and 160PSI on high.... now the high pressure line is again higher than the initial high pressure....
What do you think that would be causing this? My refrigerant are ok, my fans are working perfectly...
I do not understand why the compressor would be increasing the pressure of the high pressure line. Maybe the pressure sensor is bad, allowing the compressor to increase the pressure on the line? Any help would be appreciated because I have visited my ac technician many times, and he is one of the best in the area, and I do not want to replace everything to solve the problem!

Thanks in advance
 

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Check the txv............thermal expansion valve, sounds like the bulb is not picking up the suction line temp,or the screen is plugged when the system operates.
In most cases when the compressor blows up all the bits and pieces flow into the system and I have had to replace the evaporator coil.
 

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Discussion Starter #4
I think it is hard to test any part because the ac works perfectly for a couple of days and it is increasing its pressure slowly until it reaches a pressure so high that it stops working. I live in South america, so would have to import any part needed to be replaced. Considering that I would have to disassembly the dash to check the expansion valve...do you recommend just to purchase the expansion valve and replace it, or do I have to replace the expansion valve and the evaporator? Or do you know how to test the expansion valve...that is working but must be a little clogged? The ac workshop pass maintenance oil and gas through the expansion/evaporator line... but apparently it was not enough to fix it.
 

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you cant check it it opens when there is a set pressure, your seams to be no opening sometimes. you can remove the evaporator box be removing the glove box blower fan housing, the disconnecting the hoses on the fire wall. Can't tell about the evaporator you have to look at it. sometimes if the drain is clogged they corrode on the bottom. Good luck
 

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Discussion Starter #6
Thanks guys...
Based on your advice, I visit an ac specialist to check the expansion valve and found that the evaporator was a "little" dirty. Somebody remove the ac pollen/dust filters, so I was using my ac without any filter for a long time. As a result, the evaporator was dirty and it was causing it to freeze and also freeze the expansion valve, thus causing the higher pressure on the line.

This is the image of the evaporator dirty.
Evap Sucio.jpg

This is the image of the evaporator cleaned.

Evap Limpio.jpg

And this is the image of the blower and the new filters...

blower.jpg

I hope it will solve all my problems with ac. Thanks again for your support.
 
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