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  #1  
Old 09-01-2015, 09:35 PM
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'04 Overland 4.7 v8 - Overheat - hydraulic fan?

I have a 2004 Overland 4.7 v8 with 135k. Overheating despite new radiator, water pump, t-stat, radiator cap and temp sensor. No signs of head gasket issue (no white smoke from exhaust pipe, no loss of coolant, no sign of combustion gas in reservoir tank).

I've read some articles referencing the hydraulic fan, and the hydraulic fan solenoid. The fan does spin under normal temp, and does pick up speed once it goes over 210, but I wonder if it is not doing enough.

Has anyone resolved their cooling issue by replacing the solenoid?

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  #2  
Old 09-01-2015, 09:38 PM
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Re: '04 Overland 4.7 v8 - Overheat - hydraulic fan?

Are you sure there is no air in the cooling system? Will turning on the heater cause the temp to drop?
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Old 09-01-2015, 10:05 PM
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Re: '04 Overland 4.7 v8 - Overheat - hydraulic fan?

Turning the heater on only works momentarily, it will steadily climb in temp. Heat is blowing hot air, and AC works fine as well.
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Old 09-02-2015, 10:42 AM
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Re: '04 Overland 4.7 v8 - Overheat - hydraulic fan?

Does it overheat while standing still and while driving?
Did it overheat before changing the thermostat?
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Old 09-02-2015, 12:01 PM
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Re: '04 Overland 4.7 v8 - Overheat - hydraulic fan?

Yes, it will overheat at idle, as well as driving. And yes, it did overheat prior to new t-stat.
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Old 09-02-2015, 12:36 PM
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Re: '04 Overland 4.7 v8 - Overheat - hydraulic fan?

If it overheats while driving, i would discard a problem with the cooling fan. To which temperature does it go max?
All the parts where changed because of the overheat problem? Do you have an infrared thermometer, to confirm the actual temperature?
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Old 09-02-2015, 12:52 PM
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Re: '04 Overland 4.7 v8 - Overheat - hydraulic fan?

Yes, all the parts were changed due to the overheating. I have both and '05 with the 4.7 and an '04 with the 4.7 HO.

The '05 just had an overheating issue, less than 2 weeks ago, the the water pump, t-stat and fan clutch were replaced. No overheat issue since with the 2005.

Got the '05 back, and then the '04 started having the overheat issue. That is when I had the water pump and t-stat done. Still overheating, so the radiator was replaced.

I have an infra-red therm gun, and I used in on the '05, and the old radiator temp was much warmer than the '04. the '04 temp on the grill side of the radiator was only 80, whereas the 05 was around 125. That's what led me to believe it was a radiator issue.

Replacing the t-stat again today - many have suggested even a brand new t-stat can be bad. Also, I understand now, there is a specific bleeding process.

I just found this:
STANDARD PROCEDURE - REFILLING
COOLING SYSTEM 4.7L ENGINE
(1) Tighten the radiator draincock and the cylinder
block drain plug(s) (if removed).
CAUTION: Failure to purge air from the cooling system
can result in an overheating condition and
severe engine damage.
(2) Remove the cooling system bleed plug from the
radiator upper hose inlet housing. (Fig. Fill system
using a 50/50 mixture of ethylene-glycol antifreeze
and low mineral content water, until coolant begains
coming out of the cooling system bleed hole. Install
the cooling system bleed plug. Fill radiator to top and
install radiator cap. Add sufficient coolant to the
reserve/overflow tank to raise level to FULL mark.
(3) With heater control unit in the HEAT position,
operate engine with radiator cap in place.
(4) After engine has reached normal operating
temperature, shut engine off and allow it to cool.
When engine is cooling down, coolant will be drawn
into the radiator from the reserve/overflow tank.
(5) Add coolant to reserve/overflow tank as necessary.
Only add coolant to the reserve/overflow
tank when the engine is cold. Coolant level in a
warm engine will be higher due to thermal


expansion.
To purge the cooling system of all air,
this heat up/cool down cycle (adding coolant to cold
engine) must be performed three times. Add necessary
coolant to raise tank level to the FULL mark
after each cool down period.
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  #8  
Old 09-02-2015, 01:26 PM
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Re: '04 Overland 4.7 v8 - Overheat - hydraulic fan?

If you donīt remove the bleed plug during filling, you can locally overheat the engine, due to air pockets. This can severely damage the engine. It would be interrested to see what the coolant temperature is in the engine. You can point the infrared gun on the aluminum part where the bleed screws sits or on the block itself, just to confirm its really overheating.
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Old 09-03-2015, 12:12 PM
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Re: '04 Overland 4.7 v8 - Overheat - hydraulic fan?

Finally, the overheating issue has been resolved.

I had the buy another thermostat (2nd new thermostat). Crazy, that a part brand new out of the box did not work to begin with.

While I probably did not need the water pump and radiator replaced, with 135k, it would happen sooner or later. So I should be good for a while.

Thank you for your suggestions. Every bit helps.
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  #10  
Old 09-03-2015, 04:59 PM
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Re: '04 Overland 4.7 v8 - Overheat - hydraulic fan?

Thermostats being a mass product, the quality is not allways as desired. Makes trouble shooting even more difficult, since you would expect to narrow down on a problem when changing parts.
Good to hear your problem is solved. Happy jeeping.
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  #11  
Old 09-07-2015, 09:28 PM
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Re: '04 Overland 4.7 v8 - Overheat - hydraulic fan?

Just when I thought my overheat issue was over...ergh!

Got the Overland back Thursday night, drove fine Friday, and drove 4 hours to the beack on Saturday. 1.5 hours was in bumper to bumper traffic.

Drove back today, and anytime we would sit at a light too long, or got stuck in slow moving traffic, we would steadily go past 210. Got off the main drag, and took the country roads back home.

As long as we kept moving steadily, no issues. But there were a few long lights, where I had to turn off the ignition so we would not sit there and bake the motor.

I'm just stumped. New water pump, t-stat (2nd one) and radiator. The fan is going on high once we get over 210.
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Old 09-07-2015, 10:11 PM
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Re: '04 Overland 4.7 v8 - Overheat - hydraulic fan?

How far does it go over the 210? That it goes over the 210 is not that bad, as long as it is not going too high. Eventhough you hear the fan going to high speed, does it also move a lot of air? Does the noise it makes when at high speed, sound as a B747 in take off?
Are the air dams around the radiator in place?
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