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Check the radiator fins for proper air flow. You can shine a bright light thru the radiator from inside the engine compartment to see if the light shines thru the front condenser coil. If you can not see much light you need to rinse the radiator fins in both directions; engine compartment...

IF the cowl vent and the cowl seal have been ruled out; then check the rubber windshield frame header seal where the top meets the windshield frame. When I purchased my '01 several years ago the inside of the Jeep smelled like mildew due to numerous pin holes in the Smitybilt soft top...

Lift your hood and explore the PDC (fuse box on passenger fender), remove the Fuel Pump relay and Automatic Shutdown relay and reinsert into their receptacles. You will need assistance for the next step. Place your finger on the fuel pump relay and turn the ignition to ON; you should feel the...

Hope this schematic assists you in troubleshooting your problem.

Mopar 04874464AC https://www.quadratec.com/products/52250_9001.htm?gad_source=1&gclid=CjwKCAjw9eO3BhBNEiwAoc0-jTFGhNlnaAnF5jSo2HO3Wdn5txbBkoqjLh_MtD5gSQ7Ab8IfHL6vwhoCCSAQAvD_BwE

Try searching on the Connector Experts website. https://connectorexperts.com/ag-1859227-chrysler.html?matchtype=p&network=g&device=c&keyword=chrysler connectors&campaign=1731994958&adgroup=70756389547&gclid=CjwKCAjw092IBhAwEiwAxR1lRlJvSax0-4BWTjsTfMbpoPKPKGxJHHse75OBdCNUm6UZO3GIMdQ_vxoCdO4QAvD_BwE

Some of that residue appears to be RTV, but there are several silver chips that could pose a concern. Was there any buildup of particles in the pan ? What was the color of the fluid when drained ? When you state you are changing the fluid; are you just replacing the fluid drained from the...

Redline MT-90... or some members have tried Valvoline Syncromesh with good results.

The 4.0L in our TJ does not have a coolant sensor on the side of the block; it is located on the thermostat housing. The earlier generation 4.0L has a coolant temperature sensor screwed into the rear right corner of the head. I could be wrong, but isn't that a Renix (<'90) 4.0L ?

You appear to have covered everything in the cooling system. What is the condition of the radiator fan shroud ?

I had a similar problem several months ago when I replaced the speedometer gear to calibrate speed after changing tire size. What I discovered was the O ring has split and was interfering with the mesh of the gears. Remove the speed sensor housing and check the O ring to ensure this hasn't...

I have heard of improperly grounded alternator casings causing the symptoms you are describing. Place a grounding cable between the alternator casing and the frame.

Mopar Header Opening Seal 55395101AC

When I purchased my '01 the inside of the Jeep smelled like mildew due to leaks in the soft top. Replacing the soft top resolved 95% of the leaks, but I continued to have a leak that would deposit water in the passenger and drivers side floor boards. During a really bad storm with heavy rains...

There is a needle bearing assembly that supports the steering shaft in the engine compartment along with a steering coupling assembly. Read thru this discussion where forum members have similar noises...

Try the Crown headlight switch for your '99 IF you cannot locate an OME Mopar part 56009869AB. https://www.quadratec.com/products/55211_0005.htm

This may not be a problem, but I would check the fuel pressure to ensure it is approximately 49 psi just to make sure.

Its the 3rd STICKY in the TJ Resources section. Then search for your year Parts List. On the '06 it is diagram 9-130 and on the '05 it is diagram 9-120. Jeep Wrangler TJ Factory Service Manuals (FSM) & Technical Documentation

(4) M10x1.5x28 The part can be researched in the Parts Catalog of the Resources section on this forum for the transmission mount figure 9-130. https://wranglertjforum.com/attachments/2006-tj-parts-list-pdf.14046/

Since purchasing the '01 I started a spare parts cabinet and with the availability of some OEM Mopar parts becoming scarce; I continue to purchase them when the OEM Mopar parts turn up. New OEM Mopar radiator (still in the box), alternator, fuel pump, CPS, CKPS, IAC, TPS, coolant temperature...