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I have a 2004 Jeep Grand Cherokee. While sitting in idle/at a stop, temperature increases a little to just above 210 and the fan is increasingly loud - sounds like it's going to burst out. It also makes a clicking noise as the speed increases. After shutting off the motor and restarting it seems to be fine until it heats up again while sitting.

What could be causing this?

  • Is there a reason you wouldn't expect the fans to come on when the engine heats up? They are trying to cool off the engine, right? – JPhi1618 Jan 28 '16 at 16:41
  • @JPhi1618 I think his concern is the loud noise and clicking noise. – rana Jan 28 '16 at 16:47
  • @rana You may be right - I read the clicking noise as the high-speed relay turning on (does it click more than once?), and of course the higher speed would be louder. I guess we just need more details. – JPhi1618 Jan 28 '16 at 16:57
  • Probably the root cause of the fan noise and clicking is the engine is running too hot. – philbrooksjazz Jan 28 '16 at 17:17
  • This model has a viscous fan clutch, right? The fan clutches on this particular era of Jeep/Dodge are very noisy when they engage. Please confirm that this isn't a sudden occurrence – Zaid Jan 28 '16 at 18:19
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We had a similar problem on our 09 Chevy HHR, it would heat up at long lights and in bad traffic. Sometimes the fan would go into a hi speed mode that was quite loud.

I would suggest going to a Jiffy Lube or similar type of place to have the cooling system flushed. That solved our problem, now it runs below 200 all the time. You definitly don't want to overheat the engine, that could cause a warped cyl. head or worse, and be very expensive. If the flush doesn't work, you might try replacing the thermostat. The water pump is also suspect, but try the cheaper fixes first. Good luck.

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