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  #13  
Old 02-09-2011, 12:42 PM
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Re: 2004 hydraulic fan noise

Hi Planenut, any update from your side?

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  #14  
Old 02-09-2011, 10:39 PM
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Re: 2004 hydraulic fan noise

The shop in KY had it from Saturday til Tuesday.. Really found nothing to speak of. They checked with Chrysler who reported problems with aftermarket thermostats so I went along with the change for lack of anything else to try. They never were able to duplicate the problem. They drove it over 20 miles and left it running for hours.

I asked them about the radiator cap and also if the Dexcool I used was an acceptable coolant. Prestone Dexcool was said to be as good or better then the required coolant.

They did say that they checked the temp sensor and it was spot on.
They also said something to the effect that the radiator showed different temperatures at differernt sides and that supported the thermostat potential. I don't really see how that supports the thermostat as a problem.

Anyway, my wife picked it up and paid the 180ish bill for troubleshooting and thermostat replacement. She is not driving home until Friday so I won't know anything else before then..

Thanks for checking back.. I will update as I know more.
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  #15  
Old 02-10-2011, 08:29 AM
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Re: 2004 hydraulic fan noise

I installed the Stant thermostat on mine and was also thinking in this direction. But yesterday changed my radiator cap and bingo, problem solved. Did you try to squeeze the upper radiator hose with engine at operating temp? (use a glove or some rag to not burn your hand), the hose should be rock hard and you should not be able to deform it. On mine i could just deform it warm as easy as i could do it when cold, showing that there was no pressure buildup in the system. When not changed yet or in the last few years, i would advise to do so.
I had in fact the same problem as you had, just a little higher then normal temp when driving at highway and the cooling fan at higher then normal speeds.
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  #16  
Old 02-11-2011, 02:25 PM
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Re: 2004 hydraulic fan noise

My manual says to remove the plug and burp 4 times, of course after driving in-between each burp. I have no idea where the air hides. I'd change my fluid but who wants to do the burping. Fan shouldn't come on at highway speeds. You may still have trapped air pockets even after miles of driving.
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Old 02-11-2011, 03:54 PM
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Re: 2004 hydraulic fan noise

The hydraulic cooling fan is always on, only it should rev at approx. 600 rpm when no extra cooling is needed. Normally all air should go to the highest point in the system, underneath the radiator cap, and should be drawn to the expansion reservoir when heating up. Normally you only should remove the bleed screw only once when filling the system.
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  #18  
Old 02-12-2011, 08:09 PM
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Re: 2004 hydraulic fan noise

Well my wife drove it home (10 hours) and didn't experience any difficulty so MAYBE it is fixed.. I'm away on the West coast until Monday or Tuesday. I'll try a few more things when I get home including the squeeze the radiator hose (while hot) test and might just change out the cap for good measure..

Wish me luck and I'll report back.
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Old 03-28-2016, 01:04 PM
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Re: 2004 hydraulic fan noise

Hey guys I know this is an older post but I just ran into a issue with my 05 jeep Cherokee limited 5.7L... My issue I'm having is that as soon as start the jeep and put the jeep in reverse to get out of drive way my cooling fans starts kicking on right away and will stay on, So far I've had the following items replaced! New Radiator, New AC condenser, New water pump, new temp sensor, New thermostat, Today I'm having some AC work done such as putting in new AC discharge line and a Liquid line installed as well with Drier, I'm trying to figure out what is causing my stupid Hydraulic cooling fan to kick on right away, There are times when I start the jeep and idel and fan doesn't kick on but as soon as I put into drive the fan starts kicking right away... ANY IDEA'S what might be causing fan to kick on right away? Any Help will be appreciated
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Old 03-28-2016, 07:21 PM
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Re: 2004 hydraulic fan noise

Do you mean that the fan goes to high speed? The fan should always run as long as the engine runs, only with low speed (500-600 rpm).
There are some inputs which cause the fan to go into high speed.
A missing coolant temperature info for example will bring it to max rpm.
The AC pressure signal can also rise the rpm, but that normally goes gradually.
Transmission oil temperature is an other input which can rise the fan rpm.
The signal for the cooling fan to change speed, comes from the PCM. So a faulty PCM can also change the fan rpm.
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  #21  
Old 04-09-2016, 10:24 PM
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Re: 2004 hydraulic fan noise

Wish my fan would go up in speed
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  #22  
Old 04-10-2016, 08:25 AM
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Re: 2004 hydraulic fan noise

Quote:
Originally Posted by hoffmanestates View Post
Wish my fan would go up in speed
Your fan doesn´t increase speed? If you remove the connector from the coolant temp sensor, doesn´t it go to full speed?
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