HI there,
If the refrigerant is low you must have a leak, this is normally found you adding a dye that is visible under ultra Violet light, it is a quick and simple way of finding leaks, they should also try an electronic sniffer to check the vents as I may be in the evaporator under the dash and this will be impossible to view the the dye.
Mark (mhpautos)
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Monday, July 20th, 2009 AT 1:24 AM