At least 200,000 miles.
Most auto parts stores can supply you a re-manufactured engine with a decent warranty for your Cherokee. If you want "new" you will have to do business with a Jeep dealership and pay through the nose.
You don't adjust it. You buy a new one and replace it.
One can buy a brand new Jeep Sahara from the Jeep dealership. One can buy a used Jeep Sahara from Kelley Blue Book. Another place to buy a used Jeep Sahara is on Auto Trader.
A replacement leak detection pump for a 2002 Jeep Liberty with a 3.7 liter V-6 engine is between $100 and $110, depending on where it's purchased. The Mopar part number is 4891416AD.
get a new engine DUMMY!
I have a 91 Cherokee and bought a new inline six from rebuiltautoengines.com It cost me about 2000 to have it sent to my house, and it has been running great for me. It was all built to exceed the standards for the engine at the year.
You can buy 2007 Jeep Commanders from used Jeep dealers on your local area. To find a list of new and used Jeep dealers in your area check your local yellow pages.
Your local jeep dealer would be a great place to start.
you might need a new part. ;3
If you do not get the engine fan fixed, you will suffer overheating problems. In the summer, should you take it on long drives, the Jeep will overheat, most likely causing gasket damage to either the valve cover gasket, head gasket, or oil pan gasket. It can also damage the hoses, the connection for the hoses, the thermostat gasket, the thermostat; And that's just for the cooling system. If you allow your vehicle to overheat, you can cause severe internal damage, the worst of which would cause you to have to buy a new engine.
Someone can purchase a new top for a Jeep at many locations. Some of the retailers who sell Jeep tops include Jeep, Quadratec, and Jeep Top Depot. Tops offered by these retailers can be hard tops or soft tops.