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Old 05-21-2016, 01:26 PM
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Over heating problem

I own a Grand Cherokee LTD, 4.7L HO with a hydraulic fan...
It has begun to over heat. I have replaced the thermostat, water pump, and radiator. It used to run at around 195- 210, now it runs at 210-220. Can somebody please tell me what could cause this ?

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  #2  
Old 05-21-2016, 03:00 PM
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Re: Over heating problem

Welcome to the garage.
Does it run those temperatures on the highway? And when standing still? Did you check if the AC condensor in front of the radiator is not clogged with debris?
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Old 05-21-2016, 03:25 PM
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Re: Over heating problem

It heats up when driving. It will cool down at idle. Higher speed, higher temp...
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Old 05-21-2016, 03:27 PM
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Re: Over heating problem

A/C condenser is clear...
Thanx
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Old 05-21-2016, 05:38 PM
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Re: Over heating problem

I would check if the indicated temperature is the real temperature. If the sensor is getting bad, it could indicate a wrong temperature. Do you have, or can you loan, an infrared temperature meter?
Did you change the thermostat after the heating problem occured, or was it changed before?
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Old 05-22-2016, 12:11 AM
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Re: Over heating problem

I'm not fully caught up on this modern technology. You say hydraulic fan, does it have a clutch?
When the problem began, how badly did it overheat? Steam, fluids boiling out, etc? Did you allow it to fully cool off before adding coolant to the hot engine? Are you currently having to add coolant to the overflow bottle?
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Old 05-22-2016, 08:36 AM
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Re: Over heating problem

No clutch. It spins when motor is running. It has solenoids that change flow which changes fan speed.

I have a 4.7 also and hate!!! How 210 is normal.

A 15L diesel would be over heating at 215
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Old 05-22-2016, 09:30 AM
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Re: Over heating problem

I did change the thermostat, but that was before the water pump, and radiator swaps. Could the relay in the bumper be bad ?
It did boil a couple of times. Since the radiator swap I have had to add coolant to the radiator, in small amounts. It doesn't seem to be pulling water from the jug...
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Old 05-22-2016, 09:44 AM
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Re: Over heating problem

Head gasket?
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Old 05-22-2016, 01:07 PM
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Re: Over heating problem

Does the hydraulic fan also have an electric relay ? Is the hydraulic fan supposed to speed up when the a/c is on ?
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Old 05-22-2016, 01:11 PM
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Re: Over heating problem

Yeah
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Old 05-22-2016, 01:40 PM
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Re: Over heating problem

Quote:
Originally Posted by hoffmanestates View Post
Head gasket?
That's the direction I was thinking. Seems like water is now going somewhere with no leaks. But with all these electronics who knows? I'm too old school. Frango100 seems to be up on codes and electronics and tends to follow a logical flow path toward a solution. Interested to find out the cause.
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