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Does it overheat? Which engine does your jeep have? If it has the 4.0, then it has an electrical cooling fan and the control relay most of the times fries. Its hidden under the bumper cover under the right hand headlight (seen from drivers position). Many time this relay fries due to the fan which is drawing too much current.
If your jeep has the 4.7, then it has a hydraulic cooling fan. That fan always idles (300 rpm) when the engine runs and will ramp up when the engine temperature gets too high. There is a control solenoid for this fan, but when its bad, then you should have the check engine light. Check for fault codes using the key dance: ignition switch off/run three times and leave in run at the third time. The odometer will show "DONE" when all ok, or any fault code(s).
The radiator cooling fan is probably thermostatically controlled. When the engine is hot the fan will probably run for a while when the engine is off. If it continues to run the temperature sensor may be bad. If your battery is running down the fan may be the problem.
If a/c is on, fan will run all the time, if a/c is off, and fan still runs and don't come on and off with temp. check cooling fan relay could be stuck in the on position.
SOUND LIKE ENGINE GETTING TOO HOT.THAT WILL CAUSE LOST OF POWER.CHECK COOLING CLUTCH FAN IF IT HAS RESISTANCE WHEN ENGINE HOT FAN CLUTCH IS GOOD.IF FAN CLUTCH FREE WHEELS WITH NO RESISTANCE WHEN ENGINE HOT.FAN CLUTCH IS BAD.THAT WILL CAUSE ENGINE TO RUN HOT WHILE DRIVING.
cooling fan will not come on until about 230 degrees, if fans still do not work. check the fuses and relay. if ok then run a wire to fan from battery.on fan side connection, run a wire from battery positive to fan connection. run a wire from negative to ground connection.if fan will not come on it is either bad or the coolant temp, sensor is bad. because this sensor send info to pcm from various running conditions. it is very important that this sensor works. it can cause;
If the engine is hot the electric fan will run until it is cool. As long as the engine isn't overheating and the fan doesn't run for more than 10 minutes or so it should be ok. If it has two radiator fans they should both be running though.
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