Question about 2004 Jeep Wrangler
Do not drive it 'till you have the problem solved or if you already haven't lost the cylinder head gasket, you will!!
First thing to check is that the fan (s) works. If mechanical and electric fans are good, check the thermostat. In fact, just replace it as it is inexpensive and once overheated they become unreliable.
Make sure the cooling system is full when cold, both in the recovery bottle and in the radiator If it's not full, check for leaks hot and cold..
If you have any unexplained coolant loss and see white smoke from the exhaust, the head gasket has failed. If you have a 4.0 engine, also be aware that they develop micro-cracks in the cylinder head (problem began in about 2000 but there are still a few showing up) All heads from 2000 and up should be magnafluxed to prevent re-use and immediate failure after a head gasket has been replaced.
Your radiator needs to be flow tested as well but at 5yrs old, unless there is a huge amount of minerals in the water in your location, likely it's good.
Work from the easy items up to the more difficult, unless you see something that definitely has a problem. If you have a question about what you find, just ask. If you have no experience it is a good idea to buy a chilton or haynes manual before beginning. That will save you lots of time and aggravation!
Posted on Sep 08, 2010
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Posted on Jan 02, 2017
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