Question about 2004 Jeep Grand Cherokee

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Runs hot when idling. no water leaks - 2004 Jeep Grand Cherokee

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  • Richard Scordino Aug 20, 2010

    how hot? Overheating?

  • sdives Aug 20, 2010

    the jeep is overheating (into the red zone, 260 ) when I'm in stop

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  • Jeep Master
  • 6,982 Answers

OK, that's way too hot.
Here's a few things to check out. First, when it's that hot, the electric fan(s) should be on.(relays, temp sender and wiring or fan motor itself are all suspect). The mechanical clutch fan should also be locked and not free wheeling. If OK, then likely you have a flow problem which can be either external, leaves bugs etc packed into or between the A/C condenser and the radiator, preventing enough air to be drawn through. Internal, you may think the radiator is allowing full coolant flow but often a number of passages become blocked. Jeep radiators are seriously on the small side and are very sensitive to this. Flushing with over the counter chemicals often will clean only the passages that are already flowing or marginally flowing but go around any solid blockages. Sometimes a professional flush will help (radiator removed from vehicle), sometimes the only remedy is a new or good used one.
Before getting into any serious repair work, replace the thermostat.
They are inexpensive and after repeatedly running too hot become unreliable, so should be replaced anyhow..
A partially opening t stat can give you problems like yours so always do that first!
After you have found and repaired the problem, always check coolant mix with a hydrometer to make sure it is still at 50/50 concentration.
Any questions along the way, just ask!!!

Posted on Aug 20, 2010

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