2006 range rover hse (non supercharged) overheating. Help! - Land Rover Forums : Land Rover and Range Rover Forum
 
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post #1 of 8 (permalink) Old 08-16-2014, 06:39 PM Thread Starter
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Question 2006 range rover hse (non supercharged) overheating. Help!

I HAVE A NON SUPERCHARGED 2006 RANGE ROVER HSE 4.4L. I HAVE REPLACED THERMOSTAT, WATER PUMP, LOWER RADIATOR THERMOSTAT, FLUSHED ENGINE AND RADIATOR, NEW EXPANSION TANK AND CAP, TEMPERATURE SENSORS, ENGINE OIL COOLER AND HOSES.

I CAN NOT UNDERSTAND WHY I'M STILL HAVING OVERHEATING PROBLEMS. IT APPEARS THAT I AM NOT GETTING ADEQUATE CIRCULATION. I CAN REMOVE THE TOP RADIATOR HOSE AND FEED WATER THROUGH THE TOP HOSE. NORMALLY THERE WOULD BE A RATHER HEALTHY FLOW OF WATER COMING OUT OF THE TOP RADIATOR HOSE HOUSING. HOWEVER IT TENDS TO FLOW SLOWLY. FLOWS VERY GOOD OFF THE VEHICLE AND PRESSURE TESTED WELL.

AT IDLE THE TEMPERATURE BEGINS TO RISE AND WILL GET AS HIGH AS 253 DEGREES. I CAN TAKE A WATER HOSE AND SPRAY THE ENTIRE THERMOSTAT COVER ASSEMBLY (LR007603) AND IT WILL IMMEDIATELY COOL DOWN TO AS LOW AS 80 DEGREES. ONCE TAKEN OFF THE TEMP RISE STARTS AGAIN. COOLING FANS FUNCTION AND START AS THEY SHOULD.

IS IT POSSIBLE THAT THE ENTIRE THERMOSTAT COVER ASSEMBLY HOUSING IS BAD AND CREATING THIS PROBLEM?

I HAVE DONE ALL I CAN THINK OF TO DO AS OF THIS POINT. HEADS AND HEAD GASKETS ARE GOOD, NO LEAKING THERE.

DOES ANYONE HAVE ANY IDEAS OR SUGGESTIONS? ANY INFO WOULD BE GREATLY APPRECIATED.
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post #2 of 8 (permalink) Old 08-18-2014, 12:13 PM
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Sounds like bad thermostat - maybe new one is bad ? Take it out and test in boiling water ... Replace with another new one.
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post #3 of 8 (permalink) Old 08-18-2014, 12:15 PM
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Sounds like bad thermostat still - take it out and test in boiling water. Cheap to replace with new one ...are you also sure system is bled correctly ...
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post #4 of 8 (permalink) Old 08-18-2014, 12:39 PM
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Perhaps the issue is with the radiator itself. Clogged tubes will restrict the flow. I take it overheating was the initial problem. Did you purchase this Rover new & has the radiator been maintained? I ask because perhaps a previous owner didn't keep up with the maintenance. It sounds like there is a restriction and you have replaced almost everything other than the radiator...
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post #5 of 8 (permalink) Old 03-08-2019, 03:56 PM
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Hi I just wondering what is was the problems with you cars
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post #6 of 8 (permalink) Old 03-08-2019, 03:57 PM
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I have the same problems with my Range Rover
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post #7 of 8 (permalink) Old 03-09-2019, 03:21 AM
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Sounds like a bad radiator not thermostat.
Dave

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post #8 of 8 (permalink) Old 03-11-2019, 05:48 PM
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I have the same problem with my 2006 RR. I have done everything and I am still having the overheating problem. Now I am thinking about a head gasket job

To be correct, I brought that car with that problem from the previous owner.

Now, my dilemma is either do the head gasket job or replace the engine. it just happens that I have another 2006 RR which runs perfectly.

I just love the car. I will keep you updated.
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