Tdi 300 overheating problems/mystery

clankilpatrick,

I don't know that you would hear the fan inside the vehicle unless you had your window down and were cruising around at low speed. I have heard mine in the supermarket carpark, I doubt that you would hear it at road speed above all the other noises.

If your vehicle is not getting much above thermostat temperature the fan will not come on unless you idle it while stopped. If you idle the vehicle the fan should come on eventually, how long will depend on how hot the environment is.

PAT303,

Does the Falcon fan fit straight in? Don't you have to trim the blade tips?

I've fitted two falcon fans to Tdi's and both went on with any trimming.Parking two vehicles nose to nose and feeling the air the falcon fan was blowing quite a bit more. Pat

Quote:

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Originally Posted by slug_burner

clankilpatrick,

I don't know that you would hear the fan inside the vehicle unless you had your window down and were cruising around at low speed. I have heard mine in the supermarket carpark, I doubt that you would hear it at road speed above all the other noises.

If your vehicle is not getting much above thermostat temperature the fan will not come on unless you idle it while stopped. If you idle the vehicle the fan should come on eventually, how long will depend on how hot the environment is.

PAT303,

Does the Falcon fan fit straight in? Don't you have to trim the blade tips?

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I had to trim the fan blades for it to fit on my 200tDi - otherwise the blades hit the fan shroud. And if you don't trim them enough, they will hit on anything above a 25 degree slope :angel:

Quote:

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Originally Posted by PAT303

I've fitted two falcon fans to Tdi's and both went on with any trimming.Parking two vehicles nose to nose and feeling the air the falcon fan was blowing quite a bit more. Pat

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Pat, what model Falcon?

EB falcon.They are a LH thread,you will recognise the nut when you see it.I don't know what the difference is between a 200 and 300 Tdi but I didn't modify a thing fitting them. Pat

Firstly... Do you actually have a problem???

As has already been noted, Defender electrics are notorious for making you think you're over heating when actually everything is fine.

See if you can borrow a laser thermometer, go for a drive and make it 'overheat'. As soon as it does, get the thermometer on it to confirm that the gauge is actually giving you a correct warning.

If it isn't, your problem is in the electrics.

If it is, the next step is to work out what is causing the problem.

Finally... Work out where the problem actually is rather than randomly replacing parts otherwise it's going to start costing $$$$

HTH

M

Eventhough its been awhile since I threw the post up and asked for some advice I thought I should let you all know how things turned out. I ended up buying a new viscous hub after trying every other possible avenue to sort out the overheating problems ie
1. new expansion tank cap
2. new thermostat
3. checking all eath connection and wiring to little black box and temp sender
4. checking all belts and hoses
5. cleaning out the radiator core with pressurised air etc
When I took the old hub off it was immediately obvious that there was lot of dirt and muck packed in around the centre of the hub. I tried to clean it out but it was well glued in as it looked like oil had been leaking from the hub and made a lovely sticky paste. I got onto it with the pressure cleaner and lo and behold once all the dirt was removed it was very obvious that the oil was leaking out of the centre. Only very slowly mind you. So the new hub went on and touchwood there seems to be no more overheating problems. Now just trying to see if the coolant levels change or there is water in the oil!!!! Hopefully no cracked head!!! One thing I have noticed is that the new expansion cap seems to hiss a fair bit when you turn off the motor after a fair run. I guess that its because its venting pressure. Maybe it's because I am paranoid about it and am keeping a close eye on the cooling system but I can't remember hearing the old cap doing this. Occasionally there is coolant leaking from around the cap as well but I am thinking that as the coolant:water ratio is all out of whack because of all the heating problems it is maybe boiling a bit ealier as there is more water in the mix. Hopefully a start from scratch and a new coolant change will sort this out.
Thanks for all of your help, ideas and input people
cheers
Dave

Hope all works out. I wouldn't go pouring new coolant into it until you sort out if you have a problem.

get a service place to sniff for products of combustion (gases in the cooling system)

Blocked radiator? Can't see compressed air fixing that! The coolant makes 2 passes through the radiator and they can block easily... well that's what mine was when it was running hot when I bought it 6 1/2 years ago.