Question about 1999 Jeep Grand Cherokee

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Car overheating when in idle. fluid level and

Car overheating when in idle. fluid level and quality seem ok

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Your problem may be that your fan clutch has gone out. When the car is moving, it's cool, but when stopped it's idling, the engine starts 2 get hot which causes the temp to go up. The fan clutch spends the fan, which cools the engine while stopped. I had the same problem. Once you get your new one, you would probably want to get a new thermostat as well, but ask the mechanic first.

Posted on Aug 05, 2009

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If sure that there are no leaks in the system and the radiator cap is still OK. You can check the fan if it is working by pulling out the temp sensor at the lower radiator hose near the engine. The fan should blow at full once you unplug it.

Posted on Jul 18, 2009

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Hi,

Lot of possible reasons. Some of them very stupid, even though I mention it here, sorry:

1. Thermostat regulating the cooling fluid flow - works correct?
2. Enough cooling fluid? Not leaking from somewhere?
3. Level of engine oil? Its quality? (If dirty or low oil, heat can not spreed into oil - oil is cooling subsatnce as well. If low oil level - you know what, engine is not lubricated etc.)
4. Water pump works correct? No pump, no water circulation.
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I had one friend who complained about his mazda MX3 quick overheating. My first question was, if there is cooling fluid and he told me "Of course!!! - I was in the garage yeasterday evening and fluid was refilled." The engine was hot and smoking badly after 3 mins of calm slow ride. Next day he called me with curious finding - there was no cooling fluid at all, was leaking out from the radiator. Thanks for contacting Fixya.

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Transmission??


Have you checked the transmission fluid level? The car should be driven for 20 minutes or more, then with engine running vehicle in park, pull out dipstick, wipe clean, reinsert, check level.
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