05 Grand Cherokee overheating, no engine light - JeepForum.com
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post #1 of 5 Old 04-06-2015, 05:55 PM Thread Starter
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05 Grand Cherokee overheating, no engine light

I have a 2005 jeep grand cherokee 5.7 limited, V8 hemi. When it is warm or hot outside (65 today in central Jersey), and after driving for a few miles then slowing down (in traffic or at a light), the temperature gauge skyrockets and the engine gets extremely loud. When pressing on the accelerator, the car barely moves. No check engine light comes on and the RPMs are constant, not jumping. Engine coolant is full. No smoke or smell is emitted.

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post #2 of 5 Old 04-06-2015, 06:01 PM
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Is your electric fan working?
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post #3 of 5 Old 04-12-2015, 08:20 AM
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Check out the coolant level
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post #4 of 5 Old 04-12-2015, 10:11 AM
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the 5.7 uses a hydraulic cooling fan that's run off power steering pump.
it's capable of flowing way more air than any of the electric or traditional clutch operated fans,and should ramp up from 150 to about 3000 rpm based on cooling needs. make sure that's working and your power steering pump is in good condition and good fluid .If your fan is spinning at full speed and you're still getting hot then you probably have a large air bubble in the system. how's the heat in the vehicle?
heater core blockages are pretty common the hoses should be about the same temperature going in and coming out of the heater core.

5 and counting :05 WK 5.7 HEMI
90 YJ Islander 4.2L
94 ZJ Ltd 5.2 ,00 WJ 4.0
2010 MK Patriot
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post #5 of 5 Old 04-14-2015, 01:25 PM Thread Starter
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Turned out to be a leak in the coolant pump. I ended up taking it to Firestone and $600 later it was replaced including a system flush. It has been running fine since the fix about a week ago. Thanks for all the input!
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check engine light , overheating , temperature spike

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