had an HR on a frieghtliner with same problem. for three years kept charging the system, only to lose it the next year. on third year, it got so bad, the Freon was gone before the end of summer. Finally, the local fccc figured the one line was leaking. $1,400 to replace the one line and one year later, the problem came back. now it was the second line leaking, except, this one you could stick your finger thru the line. finally, they figured, the lines were placed on top of the exhaust header and the heat was damaging the lines. ofcourse, freightliner never takes responsibility for their own faults. another $1,400 to replace the second line. at least the tech was good enough to make a heat shield for the lines which resolved the problem and did not have any issues for the next 10 yrs that I had that unit.
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17LADP/FCCC
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