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  #1  
Old 01-19-2015, 07:56 PM
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No water in block

Hi guys I have a 2003 WJ Jeep 4.7 that is overheating , the overflow bottle is full and does no return to the engine when cool ,there is no water returning to the radiator from the engine , temp gauge shows between 95 and 100c no more , check gauge light and chime come on only some times .
I have replaced the Thermostat , Radiator cap and water pump and top and bottom hoses I am waiting on a Radiator.
I have bleed the air out the cooling system and used 50/50 coolant and water ,when cool I remove air bleeder and top up coolant and add about 600ml to the Radiator .

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  #2  
Old 01-20-2015, 06:12 AM
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Re: No water in block

Any sweet smell to the exhaust fumes and/or white smoke from the exhaust? Could be a head gasket leaking, causing the coolant to be burnt of. Also check the engine oil on dipstick and oil filler neck for signs of coolant in the oil. If the coolant doesnīt return to the engine while cooling down, then there must be a leak where air can be drawn into the system.What temperature does it go to when overheating? Take really care with this engine on overheating, because it will warp the heads and can lateron cause valve seats to drop.
Is there any visible leak on the radiator? These radiators are known to cause leaks over time, mostly they crack the plastic tank where it connects to the aluminum core. If you have a crack there, then change the radiator ASAP, because it can result in a complete separation of the tank and loss of all coolant in no time.
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Old 01-20-2015, 04:15 PM
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Re: No water in block

Hi thanks for the reply .
No white smoke , no oil in water or around oil filter , temp only goes to 100c or 210 f , but hydraulic fan no longer seems to be speeding up as temp rises and twice the engine has revved on start up .
I have a new Radiator coming and I plan to change the Thermostat and Radiator cap again just encase there dodgy and I think I will change the TPS and Coolant sensor as well .
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Old 01-20-2015, 04:30 PM
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Re: No water in block

Is there any visible external leak?
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Old 01-20-2015, 05:21 PM
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Re: No water in block

Possible right hand lower plastic tank , coolant looked like it was coming from the lower hose but put on new hose and clamps and have not seen any since but it must be leaking out some wear and as there is a drown stain on the lower right tank it might be there , hopefully the Radiator will turn up Today .
PS Make it hard to find as it is our only car and my wife uses it for work so takes time to cool down to work on.
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Old 01-20-2015, 09:46 PM
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Re: No water in block

For what reason the check gauges light came on sometimes? A temperature of 100°C will not cause this.
When you are going to change the radiator, its easier to remove it complete with hydraulic fan. Then you can swap the fan over to the new radiator and mount it as one unit.
When you put new radiator hoses on, did the lower hose come with a metal spring in it? Mine didnīt , so i swapped the spring from the old hose. This spring is there, so that the lower hose will not colapse due to the underpressure when the engine cools down.
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Old 01-20-2015, 10:24 PM
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Re: No water in block

Yes I was going to take it out as a whole unit , and yes the hose did come with a spring ,I thing the check light came on as a result of low water in the block .
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Old 01-21-2015, 06:01 AM
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Re: No water in block

The check gauges normally only comes on in the following cases: Low oil pressure, low or too high battery voltage or too high coolant temperature.
Only for diesel engine instrument clusters there is a coolant low light, for the rest only the EVIC (overhead electronic vehicle information center) can show coolant low message (eventhough on my 04 there is no coolant low message anymore). But the coolant level is measured in the overflow reservoir, so if only the coolant in the engine becomes low, you would not get a coolant low message.
The high coolant temperature limit is set at 127°C. Most probably indeed air in the engine cooling system has triggered the light. Air in the engine cooling system can cause local hot spots and overheating.
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  #9  
Old 01-26-2015, 08:53 PM
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Re: No water in block

OK the Radiator was most of the problem , right plastic tank leaking from the top and bottom were tubes go into tank put new Radiator and Radiator cap on and have a new thermostat coming as well as a new coolant senor .
Does the coolant sensor control the hydraulic fan or is it the sensor in the hydraulic fan itself , but I will wait until I have put both the thermostat and coolant sensor in first to make sure I know which part is the real issue .
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Old 01-26-2015, 10:48 PM
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Re: No water in block

There is only one engine coolant temperature sensor and it sits in between the alternator and AC compressor. It sends the temperature information to the PCM, from where it is send to the instrument cluster for indication. The PCM also uses this info to send signals to the hydraulic fan control solenoid to ramp up the fan speed when necessary.
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  #11  
Old 01-26-2015, 11:07 PM
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Re: No water in block

OK
Thanks for clearing that up so hope that should fix it
Thanks again will let you know when I have fitted both the new thermostat and new coolant sensor
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Old 01-27-2015, 05:29 AM
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Re: No water in block

It is not a full proof of that the system works ok, but when you remove the engine coolant temperature sensor connector while the engine is running (or just remove it before starting the engine), then the hydraulic cooling fan should go to full speed. It will make a lot of noise and moves a lot of air then. This is just a fail safe operation from the PCM, when it looses the coolant temperature information from the sensor. You will get a check engine light for this, which has to be reset after reconnecting the temperature sensor.
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