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You can figure it had a problem since it has had dye put into it..
that is not good...as it can sometimes clog up important stuff...like your Txvalve..
and it looks like whatever the dye was put in to find... did not find all the problems...
dye is not a good way to find anything... first because it will not check the evaporator AT ALL....
A pressurized dry gas.. usually nitrogen... mixed with 4 oz of R22 can be used with a sniffer to check the system for leaks.. including the evaporator by putting it into the center vent....
You can start with reading the last reference in my signature... the AC thread...
AC work is a pain.
there are rules you need to follow to keep from making things worse...
so take your time and read lots first..
If you are going to do this yourself you need a set of gauges...
The system has safety switches built in... so if the refrigerant is low... it will not turn on so as to protect the Compressor... so put gauges on high and low side and see if you have any pressure in there..... then report what you find...
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