AC Not Cold Due to Refrigerant Leak on GMC Safari

On vans with rear AC, the AC may stop blowing cold air due to a damaged AC line near the back of the engine. It is common for these lines to rub on the engine block, causing a hole in the line and a refrigerant leak.

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Average mileage: 159,760 (50,000–249,000)
16 model years affected: 1990, 1991, 1992, 1993, more1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
29 people reported this problem
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problem details
I am unable to get cool air from the back cooling unit. I bought this van Dec. 2014. I have started my parts replacement program 5 weeks ago.
2002 GMC Safari 249,000 mi,
Rear air switch will not turn on A/C in back
1999 GMC Safari 163,480 mi,
Likely bad seal, worn or corroded line. AC not working. Rear AC in this unit.
1998 GMC Safari 249,000 mi,
Rear evaporator coil not draining properly. Does anyone have the best way to clean bottom of pan without taking evaporator out?
ac lines broke rubbing on transmission
Replaced compressor twice, leaks Freon front and rear a/c systems.
1997 GMC Safari 150,000 mi,
had it welded