What's Up Wiv This Then

Sorry for the double post but here we go

Got a 3.9 V8 in my Disco and it is fitted with a cone air filter, Will come back to that.

Problem is that when i start the car and leave to heat up all is fine, now over heating or or coolant loss ect ect.

I can then go out for a drive for say ten miles or so and park the car up the temp will then slowly rise. This also happens in traffic. once i start moving again the temp gauge goes right down. This happens when running on petrol and LPG. One of the core plugs near the starting motor then starts to drip coolant at a fairly constant pace.

After reading the forum I have noted that when the car is started the viscous fan should make some sort of woooshing noise for about a minute or so which indicates it is working properly. Mine does not so does this mean its fooked?

When the engine was warm but not been for a run, I tried to stop it, which I managed no bother and it took an age to start spinning fully again.

How do i test it? I have checked all the coolant pipes which are all warm and also the radiator is piping hot across all the cores so I dont think the radiator is the problem. No Oil in the water and no water in the oil and i cannot smell any fumes from the header tank.

Like i said when the car is moving again the temp goes right down. Any advice would be welcome which then leads me back to the air filter.

This is my first V8 and i have noticed that the temp under the bonnet is very hot to say the least, infact it is so hot i cannot put my hand on the slam panel after i have been out for a short run as it is that hot.

Obviously heat is not good for a V8 so i am thinking of ditching the cone filter and going back to a standard air box, but i don't know what the original one looks like. Is it the same as a 300 or a big metal one?:doh:

viscous fan will turn at all times but only with any torque as it heats up,it should free wheel when cold then lock when hot it sounds as if yours isnt as moving air through rad driving cools engine again ,fit new one as in good working order are best type of fan for engine

I have ordered a Used Tested Viscous Fan and waiting for it to be delivered. Do you think this is what the problem could be?

biggest cause of overheating ive found is poor rad not cooling all over core ,but as moving cools yours and youve felt it not that ,core plug wants doing ,undoing mounts and jacking engine as high as possible helps, air filter is plastic square box sits on passenger inner wing near front ,but cone should be fine,thats what i run on mine, put new fan on cure leak make sure its overfull with coolant

Thanks for the advice, much appreciated.

What cone filter are you running?

I have a spare 300 tdi air box, is it the same as the V8?

similar but not the same, just britpart cone filter works allright ,used to run air box but only have simple old single point gas kit and when spark becomes weak it backfires ,cone just pops off without damage unlike air box