It depends on where you buy it. On-line you can find them from $100 to $300. I did mine a couple of months ago and it was $125 with shipping. Be aware that the grill, headlights, and bumper cover need to come off in order to remove the radiator, it sounds like a lot but if you are careful and have access to a good manul its not that bad.
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Yes, the upper radiator support will need removed.
No.
No. They are not interchangeable.
Yes
No, they will not interchange.
I get 15 to 17 miles per gallon with my 1999 Jeep Grand Cherokee Lorado.
No. Different shape.
look it up
Yes, only if they have the same engine.