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Heeeeeelp! Overheating


fuddymuckers

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Hello all,

Firstly, apologies for my first post being a 'help me!' type post, but sometimes that's just the way it goes!
My mother has an '03 Freelander 1 V6 in her fleet which is causing me a little bit of a headache... It overheated a while back and after being recovered home was parked up in the corner and forgotten about but now I want to get it working again and sell it as a lovely low mileage (60k) used car, rather than a spares or repairs gamble for next to nowt.
When it was recovered the head was compression tested, the coolant was sniff tested, the fans were tested and the cooling system was bled but it would still overheat. Since working on it over the past few days I noticed that the coolant was boiling and the fans weren't kicking in (I'm guessing the coolant isn't getting hot enough due to lack of pressure in the system - I think the KV6 runs at about 105/110C?). I've bled the system several times (let air out of bleed screw, run for 5 mins at idle, pump bottom rad hose, run for 7mins between idle and 3500rpm, leave to cool, run up to temp) but it keeps boiling the water at the end of the 7min cycle so I switch it off before anything boils over. I noticed that the expansion bottle had lots of hairline cracks around the neck so I purchased a brand new expansion bottle and cap from LR today and fitted them - bled the system and whilst running the engine at circa 2000rpm the bottle actually SPLIT around the seam! In my experience the pressure release cap should blow if the pressure gets too high, so would this be a faulty bottle or something more sinister? What could be causing the system to pressurise so much? There are no evident leaks or split hoses, and as I said before the head has been pressure checked and the coolant sniff tested (not an exact science, I know). Both bottom and top hoses are getting hot too so thermostat is also working.
Any help/suggestions would be greatly appreciated!
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I presume the fans on an electronic thermostat?

A wax thermostat would work well below that temperature but if the fans thermostat is dead it doesn't matter how hot the coolant gets.

Pretty sure your info on running temp is off and it's too high. most cars don't go anywhere near boiling point because oils cook at high temperatures and hoses etc can't take the pressure. The only reason I can think of for a pressure build up like that is the coolant boiling so I think you need to check the thermostats controlling the fans.

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