Expert: Mike Evans - 5/8/2009

Question
A/C wasn't blowing cold compressor is cycling. added R134a refrigerant low port fitting to port and one and a half cans containing 10oz refrigerant and 2oz oil. Still not blowing cold. Considering vacuuming out entire system and using cans with just refrigerant. any ideas or recommendations are appreciated.

Answer
    There is probably plenty of refrigerant in there.  These Jeeps use a Chrysler-style block-type expansion valve, and they are famous for failing.  It should be located on the firewall under the hood in front of where the passenger sits.  The only way to tell for sure is to put gauges on the fittings and see what the readings are.  That is, if you're sure the compressor is coming on.  There is a switch that controls that, and it's screwed into the expansion valve.  You could change the valve yourself, and they're not that expensive, but this is a situation where letting a pro do it might save you breaking something expensive, plus he can salvage the refrigerant and re-use it (good for the environment).