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Here's my thread with more detail and the solution. Looks like this was 5 years ago! Man, time flies when you love your XJ! http://www.naxja.org/forum/showthread.php?t=1038440 Most shops will do an AC check for free. If you can wrangle the pressures they pull from the low/high side before...

I also have a 98 and have had AC issues. Your refrigerant is R134a and should never be exposed to the open air as it is hazardous to the atmosphere. When you select AC the compressor clutch should energize and engage the compressor which directs Freon through the system from the high pressure...

There were two different sizes available for replacement drums for the XJ....a 9 or 10 inch I believe. I wonder if you got the wrong sized replacement drum, or perhaps mismatched hardware, causing your issue. I would search either here, or in general for: "2000 XJ brake drum sizes" That...

When you have the heater on, is it set to defrost? If so, I'd be suspicious that the bearing for your AC compressor clutch has failed and/or seized. Do you hear any belt squeal or noises when you engage the AC or heat in defrost mode? Try disconnecting the low pressure cut switch on the...

You're getting lots of sound advice here, but one more quick and easy item to check is the quality of the air intake boot. If there is a crack in the boot allowing false air in on cold acceleration that could cause your symptoms. When the engine warms up, the rubber expands and the crack is...

The roaring noise from my 98 XJ was coming from a bad pinion bearing. X2 on the carrier bearings as per md21722 if you're in there might as well do them all. Once the pinion bearing was replaced my roaring noise went away and that was about 20k ago. It did require a full tear down of the 8.25 so...

You said there were no codes, but were the scan tools able to communicate in general? Could you pull live or any freeze frame data? Could you ping other modules? If not, I would be suspicious that your network (CCD BUS) might be down (although I doubt this would allow the engine to run). If you...

RKE = Remote Keyless Entry module. It is the receiver/module for the factory keyless entry system. I recently opted to install an aftermarket Cobra keyless entry system because the factory remote batteries suck, the range of the original unit is not excellent, and you need the factory DRB scan...

Did you replace the TPS with a Jeep brand sensor? I recently replaced the TPS in my 98 with a NAPA unit and it lasted about 6 months before my idle starting fluctuating and I had all kinds of drivability problems. Even from day one, the aftermarket sensor did not operate as smoothly with jerky...

Are you able to communicate with the PCM via a scan tool? If you can, then that would eliminate the network or the PCM as a trouble spot. I had a similar issue last year and ended up having an internally shorted PCM. The PCM shorted and took down my network causing a crank, no start...

I also have some ideas but since you want a one and done answer, I would suggest you take it to the dealer and let them charge you $120/hr for their one and done solution. Around here, we try to help each other out, not put limitations on this fantastic free service. I spent $15,000 going to...

I put a premium NAPA unit in my 98 about two years ago and have had zero problems or leaks. I believe it was around $65-85.

You're looking for a P0743, lockup solenoid code. You can drop the pan and ohm check the solenoids or pull the TCM connector and underhood harness and ohm check them that way. Spec is 12-15 ohms. I was having the opposite problem from you in that mine failed only when warm. I pulled it when...

I think you're on the right track with your codes and symptoms, especially the loss of reverse lights. I've had my 98 XJ for 5+ years now and I've had to rebuild the NSS once, and adjust it twice. The rebuild/clean procedure found here on NAXJA is very thorough and walks you through the...

My suggestion for troubleshooting a drain is basic Electrical 101. It's not a "MYSTERY DRAIN," and we're just trying to help solve YOUR problem for free, with the limited information you provided.

What year is your XJ? How are you taking a charging reading? With a meter at the alternator or are you relying on the dash gauge? How tight and clean are your connections? Have you tested at all for a phantom drain? It sounds like you may have a drain going on, killing your battery and...

Is it throwing any codes? I lost my OD and got P0743 on my 98 and it turned out to be a thermal failure on the TCC lockup solenoid. I replaced all 3 for $65 about a year ago and have had no problems at all between 3rd and OD.

It's common for the Schrader valves to leak just slightly, especially if they're on the older side and it was just serviced. When I recharged my 98 XJ myself I had to replace the valve after servicing as it was leaking. Sometimes the valve just doesn't seat correctly and you can put a...

Nope, definitely not. Drop the pan (I left the dipstick tube in place). Let it drain for awhile so you're not working in all ATF. Remove the filter (LOTS of ATF will pour out). Remove each connector and attaching bolt for the solenoids and pull them down and out. Install new ones and make your...

The kit comes individually packaged and labeled as the shift 1-2, shift 2-3, and OD solenoid. Just do one at a time and you'll have no troubles. I bought a filter and quality gasket kit from NAPA and have had zero leaks as well. Removal is as easy as disconnecting the electrical connector and...