Question about 1999 Jeep Cherokee

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My jeep is over heating i replaced the radiator the guy i bought it from said there is air in the system and i need to bleed it. Well i dont have a radiator cap and they dont sell radiators with the caps where is the bleed valve to bleed the air? can somone try to help me stop it from over heating?

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  • Anonymous Oct 12, 2010

    You have a rad cap,how would you fill the system,just not on the rad,find it
    Think you never checked that vehicle out,the former owner know it over heated

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  • Jeep Master
  • 6,982 Answers

First problem is the radiator cap. You cannot drive it without one. I don't remember what the pressure rating should be but about 18psi should work. Second, most times all you need to do to bleed the system is to run the engine with the heater on full heat with the radiator cap off till it reaches operating temp.. Sometimes it also helps to raise the front of the vehicle a bit to get any air to move towards the front.
If you have a 4,0 engine, be aware that there is a casting problem with many of those cylinder heads.
(they develop "micro-cracks" inside that can allow compression gasses into the cooling system and cause overheats) there is a machine that can detect hydrocarbons in the radiator and a dye test as well. Also, be sure that your thermostat is opening. Far easier to just replace it than to sit around testing it. They are inexpensive and relatively easy to install.

Posted on Oct 12, 2010

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