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Thread: Advice on 300Tdi radiator

  1. 24th July 2008, 08:18 PM #1
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    wally
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    Advice on 300Tdi radiator

    The following message just came to me from a mate of mine in Tanzania. He is working with a mob doing lion research and running a fleet of Land Rovers. Can anyone offer advice?

    Mate, just quickly,

    Got a 300Tdi here that builds up too much pressure in the expansion tank, and the hose from the thermostat housing into the radiator doesn't get too hot, while the lower hose is of course bloody hot. It doesn't take much to work out the thermostat is not opening properly and the flow is being directed up into the top tank. As a long-time 300Tdi man, you may be able to help me with a bit of sage advice: The left hand tank of the radiator gets hot, the right hand (where the oil cooler lines go in) does not at all. It's COOL!!! I don't know what the plumbing for the oil cooler bits is like. Are there just pipes inside the radiator tank for heat transfer, or is there some other arrangement??? Is that right hand tank simply cool because there's no flow across the radiator because of the thermostat (My guess...)????

    I await you advice most keenly,

    John
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  2. 24th July 2008, 09:08 PM #2
    PAT303
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    Take the rad out and get the core rodded.Don't use flush or other rubbish,there is one way and only one way.A new thermostat and hoses if they need it and don't mix coolant.Diesels like clean rads. Pat
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  3. 25th July 2008, 07:41 AM #3
    up2nogood Guest
    Ditto. Rodding and new thermostat is the only way. Although the symptoms he quotes are pure thermostat.

    Sounds like he'd better do it soon though, the next think to happen is a hose will blow from the pressure (which caused by the coolant boiling and creating steam) because it IS getting hot!
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  4. 25th July 2008, 09:46 PM #4
    uninformed
    uninformed is offline ForumSage
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    dont landrover radiators have a baffle in them, so its easier for them to get blocked.....

    Serg
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  5. 26th July 2008, 06:54 PM #5
    Bush65
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    Rovers use cross flow radiators - tanks on each side.

    When sediment falls out of suspension in a normal radiator, it builds up in the bottom tank and will not block the flow through the radiator core until it is very bad. It is easy to flush sediment out of the lower tank.

    Gravity causes any sediment to block the lower tubes of a cross flow radiator. The left tank of the 300Tdi radiator is divided at about half height so flow is one way in the top half and the other way in the lower half. When the lower tubes block a larger percentage of the radiator is blocked because the radiator is divided. Flushing will not work as other have said - the tanks have to be removed an a rod used to clear the tubes.

    Fitting the water pump as high as in a 300Tdi, is poor design. Air locks or a small loss of coolant means that the pump ceases to circulate the coolant. It can be difficult to get rid of air in the system.
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  6. 30th July 2008, 10:25 AM #6
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    wally
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    John says:

    "Please thank the chaps on the forum and I'll keep you posted on how things progress with the 300."

    I think it's about time he joined.
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