Vehicle & Technical > Discovery

V8 over heating

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disco-v8:
ok im having some trouble with my3.9 high compression V8..... well as you can tell by the title, my engine is over heating, it will be fine for about 45mins of driving, and the engine will be running fine at normal operating tempurature then susddenly the tempurature will rise making me stop and letting it cool down.....

The radiator is in great condition and doesnt leak, and the cooling system is full of water, the viscus fan is working and even my two small air con fans kick in but it still over heating!!!!!!  :o


its starting to worry me now as it stinks when it overheats and i can hear some hissing and bubbling which doesnt sound right.... i dont let it over heat completly because i dont want to damage the engine.....

also now and again after running it for a while it doesnt tick over properly and looks like its going to stall...


if anybody can please help then please do so, beacause im well confused

cheers in advance

Range Rover Blues:
Air locks, the EFi is a b******** for them.  Fill the enine via that little brass plug atop the engine and once it gets hot bleed some air out of the top of the rad and the brass plug by cracking them open a turn.

Check your hoses are fully secure.

The cr4ppy running could be because the thermo sensor for the EFi is no longer in the water, it could be the fuel vapourising.

Where does the water acftually escape from?

Are you sure it's not a head gasket?

disco-v8:
i always fill it up usuing that method, by filling it through the top of the radiator, and yep all my hoes are fine.......

im not realy losing much water that isnt realy a problem, i just have a few drops from my core plugs, thats why i need them replacing.  it get a bit worse when the engine is close to over heating though but not enough for me to get worryed....


its has always driped from them since owning the car about 2months ago and also it was running hot then, but not over heating, which i found out to be a dodgy vacuum advance and it was just sucking, so would have bin making the fuel mixer lean and running hot.... asoon as that was fixed the car ran great and with better MPG aswell... but now im getting a proper over heating problem

i do beileve the head gaskets do need replacing as ive already bought them with my core plugs...... when the engine was running hot last time because of the dodgy vacuum advance unit, it was making the gasket boil abit and making waater fizz out of it... if that makes sense

Skibum346:
Disco,

You checked the obvious, thermostat?

If yer thermostat is staying closed no water gets to the engine and what is there will boil after a short time.

Had the same problm on my 1984 3.5.

Good luck

Skibum

disco-v8:
no didnt check the thermostat, as i didnt think i needed to, because the radiator is getting stinking hot, so it must be open to allow the water to the cooling system

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