I have a leak on the passenger side rear tire

check to see if it’s the brake line that is leaking if it is do not drive the car you could lose all braking must repair right where it is or get it tow

Coolant leak by the rear tire?

if it has a rear heater\A/C unit the heater core is probably bad and leaking out of the drain tube right behind the rear tire.

Your tyres need checking for slow punctures or leaking valves. If you want to do it yourself. You'll need a tub or pool big enough for a complete wheel. Fill it with water, then, remove one wheel at a time and put it in the tub/pool. look for bubbles, the puncture is where the bubble come from.

Of course you could go to a tyre shop and get them to check, once done and you know your tyres are in good order, the only other thought is that it may be someone having fun at your expense, you could get some lockable valve caps.

Move the passenger side rear tire to the front, and passenger side front to driver side rear. Switch the driver side rear tire to the front and driver side front to passenger side rear. Repeat this "X" pattern each time you rotate the tires. Rotate the tires from side to side if the tires are different sizes on the front and rear.

This is the better solution. Hope helped (remember rated this help)

For more details about Jeep Cherokee, review the Service Manual.

Good luck.

the proper way is to take rear passenger tire up to the front passenger side, the rear driver side up to front driver side. The front driver side to rear passenger side and front passenger side to rear driver side.

Basic to get tire and hub off, remove rear diff cover remove bolt, remove clip, pull axle out, then heavy puller to pull bearing and seal. Ck axle for wear

AIR SUSPENSION BAG IS LEAKING AIR.

If it is gear oil instead of brake fluid, then the noise and oil is from the rear wheel bearing (and seal) being bad. They would need changed immediately. Rick

yes that is the expansion valve! there is a hissing sound from the restriction in it for a pressure drop thats what makes the a/c cold the hissing is normal