1996 XJ Faulty PCM Fixed (sort of) A/C issue
Been lurking around the forum for months and owe everything I know about working on my Jeep between this forum and my shop manual. Thanks guys, your help really is appreciated.
96 XJ Classic recently began burning through fuel pumps, until eventually it wouldn't start at all even with brand new fuel pumps (would not prime). Narrowed it down finally to a faulty PCM. Replaced the PCM from a junker (98 XJ Sport, same engine/trans, w/ A/C) and it worked like a charm, fired right up and has been running (a bit crazy right at first) perfect ever since.
The only problem is the A/C no longer worked after replacing the PCM, and still does not work to this day. Still blows air like it did before but no cold and compressor will not click on, neither will the electric fan. Relays/fuses are good and A/C worked perfect before.
This appears to be obviously related to the "new" PCM, but I'd like your advice on how to proceed. Do I need to program or reset this PCM somehow? Anyway to avoid a costly trip to the stealership? Am I missing something obvious?