Question about 2003 Land Rover Range Rover

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Range rover 2002 model 4.4i petrol engine, every 50-100km, losing 2litres water needs constant topping up. no sign of leaks around head gasket or rad. Inside carpet is dry so not heater matrix. what is causing the leak of coolant?

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It appears that you have a minor leak at where a hose attaches to an engine or radiator pipe. When the engine is hot, any small leak will evaporate quickly and therefore not be seen. As the coolant heats up it will expand into the overflow tank but once the engine is stopped the extra heat build up will force the coolant out the leaking joint. As the engine cools, the leak prevents the coolant from being sucked back from the overflow tank.

Check all hoses and clamps including heater hoses and those pesky little bypass hoses in the cooling system for a good tight fit and replace any hoses that have gone hard or have become soft and stretched. Those spring type hose clamps tend to be less effective in clamping as the hoses age. Worm drive ones are the best to use.

If unsure take vehicle to a cooling system specialist and have them do a pressure test and more thorough diagnosis.

If problem persists, then it could indicate a problem with the head gasket (Usually caused by allowing engine to become excessively overheated when cooling system has run dry) allowing very hot high pressure combustion gases into the engine water jacket, which super heats the coolant in the engine block, which then boils off, and is released via the cap or any leaks. If the head gasket is really bad it will leak water into the cylinders and into the oil in the sump. This is indicated by an emulsion of water and oil mix on the dipstick. You will also see white smoke (water vapour) from the exhaust.

Posted on Oct 18, 2010

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Hi could you try doing this:
get the engine warm then turn the heater on to its hottest setting then turn it on, if you only get cold air then this points towards the thermostat staying shut and if this is the case it will need replacing before you do any damage to the cylinder head and or cylinder head gasket.

if you have hot air coming out the the problem could be one of the following problems.
1, check for any signs of leaking coolant if you have a leak then this lets air into the system causing an air lock this stops the water pump pumping the coolant around the system and this prevents it from cooling, the leak could be either split hose, damages rad or leaking water pump so have a good look around all the engine and pipes looking for leak, the water pump is located where the timing belt is so have a good look around here.
2, water pump could be damaged and may need replacing.
3. worse case you head gasket could be damaged, if you find no leaks ant the thermostat is ok then your going to need to get the head gasket checked your car will need taking to a garage to have a color test done this checks the coolant for signs of engine gasses and if they are found it indicates head gasket failuer.
it will cost next to nothing for them to do this test.

if it is the head gasket then you need to find out what caused the head gasket to fail, it could have failed on its own or the water pump or thermostat could have caused it to fail.

check the oil for signs of water if you have a white substance if the oil filler cap then this is a sign water is getting into the oil via the head gasket, also check the coolant for the same signs of a white substance this indicates head gasket failure and the only solution would be to have the engine re-built to replace the cylinder head gasket.
this is a big job to do

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