Question about 2002 Land Rover Freelander

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Overheating when motor is running the upper hose is hot and the lower hose is cool leading me to believe 1 of 3 things. thermostat, water pump, or blocked with sludge.

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That would indicated your thermostat is stuck, the other possibility if this is a 4.6 liter that the head gasket is leaking and there is an air pocket not allowing the thermostat to open but i would start small with the thermostat these 4.6 motors love head gaskets so don't overheat it too much more please rate -jeff

Posted on Sep 05, 2008

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The upper hose is suppose to be hot this lets you know that the thermostat is working like it should. if it were cold that would indicate that the thermostat was bad. i would say that it's the water pump because your not getting the circulation if it were a blockage your upper hose would still be cool as well.. hope this helps please rate...thanks

Posted on Sep 05, 2008

Defo water pump had the same problem but cooked the engine new headgasket plus water pump and all the belts.

ron

Posted on Sep 16, 2008

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Ok, g35 coupe 06,52k miles Had over heating problem in april 2010,replaced thermostat, all's well. Now Jan 2011 overheating again, noticed upper & lower radiator hoses collapse, changed thermostat...


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Then replace the thermostat, because if on lower hose not hot and on upper hose scalding hot = antifreeze flow blocked by the thermostat wich remains closed!!!

Thermostat replacing:


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Car is over heating changed thermostat water pump isnt leaking or making any noises


Ok well there are a number of possibilities. One to keep in mind is that some water pumps are really cheap and the fins will corrode and rust off leaving nothing behind to actually pump the water. If the pump really is working fine then there are two more possibilities. 1 the radiator is clogged, 2. there may be a head gasket leak. 3. you are sure your gauge is working right? 4. you didnt say what year or kind of car it is.. Is the electric fan working? When the engine is overheating, are both upper and lower radiator hoses hot? If the water pump or the thermostat are failing the upper radiator hose can be hot while the lower can still be relativly cool. If the radiator is plugged or the fan isnt working then both hoses can be Hot. There is also a remote possibility that water passages in the head gasket could be plugged.

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Overheating


Overheating can be caused by several things including low/no coolant, blocked/broken hose, faulty water pump, stuck thermostat. CHeck the coolant level in the over flow tank and in the radiator itself. If it's low you know you have a leak somewhere. If it's full you know the coolant isn't circulating through the system.

Let the car run until it heats up then feel the upper and lower hoses on the radiator, they should both be hot and firm when the coolant is circulating. If the top is hot and the bottom is cool and pliable then you know the coolant isn't going through. The most common cause of this is a thermostat that isn't opening. Look to make sure the water pump is operating properly, that's what circulates the water through the motor.

If you suspect a leak then you need to find where it's coming from. Check around the head/intake gaskets for signs of leakage as well as around the side tanks on the radiator and all hoses and connections.

Start with the small/obvious things first and progress from there. Good luck.

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