Question about 2004 Jeep Wrangler

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Installed an electric fan because of over heating problems with winch in front of radiator. still overheating

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  • Richard Scordino Aug 24, 2010

    I'd remove the winch and drive it for a while just to verify that it really is the winch that is causing the problem. Most winches won't block the radiator enough to cause that unless someone used a large solid plate between the winch and radiator to mount it..

  • tjemas Aug 24, 2010

    When I installed the winch with the regular fan, it started overheating. I put an electrice fan on and it still overheats with or without the winch. Could it be the thermast? It only heats up when I have to pull up a long hill and have to down shift to 4th. Around town it stays at about 215 degrees.

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  • Jeep Master
  • 6,982 Answers

It could be a thermostat that is only opening partially or, the radiator may need to be flushed. Radiators on Jeeps are nearly too small for the application and are very sensitive to blockages. When the engine is loaded such as going up hill, is generally where any deficit in the radiator becomes evident. Some increase in temp is normal when pulling up a long grade and with a 50/50 antifreeze mix it should not boil over unless it gets very hot.
215 degrees is about 5 degrees hotter than it should be around town. "normal" is about 210, sometimes a bit less.

Posted on Aug 24, 2010

  • tjemas Aug 24, 2010

    I will try the flushing first. Thanks for the advice.

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To "heat up" is normal. We want the car to heat up, but to go any higher than about 225 degrees would be to overheat, and that would be bad. If that is what you mean, then there are a number of things that could be causing it. It could be as simple as to high of a concentration of anti-freeze to water mixture(should be a bout 50%), to something as costlty as a blown head gasket. The water pump could have the impellers rusted off and not pumping, the radiator could be stopped up, there could be air trapped i the cooling system, there could be an obstruction to air flow in front of the radiator like leaves trapped in front of it, the cooling fan may not be working, even the thermostat you installed could be defective or installed backwards. It boils down to this: You either have a coolant flow or an air flow problem. (I am including the blown headgasket in the coolant flow catagory) As simple way to narrow it down is when then car is running hot, put your hand on the radiator. If the radiator is hot, then you probably have an air flow problem, see if the fan is working, or there are leaves in front of the radiator. If the radiator is cold, then you have a coolant flow problem, something is keeping coolant from flowwing into the radiator. (water pump, ai in the system, stopped up radiator, etc)

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