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Old 2nd December 2006, 02:25 PM
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Direction of coolant flow in v8

Having fitted a vdo temp gauge to the disco recently I have noticed that the coolant temp is hitting around 107 degrees c while idleing, with aircon on when the temp is around 30-35 outside. Now the temp sensor is mounted in the top radiator hose (simplest installation) and I am concerned this is the cooled temperature ie after its been through the radiator.

So does anyone know what the direction of coolant flow is for the v8's (97 disco if that changes anything). Does it flow from the top to bottom or the other way round.

While were at it does anyone know the ideal operating temp range of the v8's?

Cheers Stuart
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Old 2nd December 2006, 02:35 PM
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The top hose is the outflow. 107 degrees, is very good,
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Old 2nd December 2006, 02:51 PM
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The attached shows the flow of coolant.

...............and as said 107c is pretty goog.

Ladas

Last edited by ladas; 11th January 2007 at 04:36 PM.
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Old 2nd December 2006, 02:51 PM
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107 sounds a bit like the upper limit to me, but so long as it doesnt go above the calculated boiling point of the coolant at the systems operating pressure then its all sweet. Id have thought about 98/102 would have been normal

also be wary that the electrical VDO gauges while inherintly accurate themselves do have read errors based on the vehicles electrical system, and how you hook them up.

The mechanical bulb type ones I like to calibrate with a pot of boiling water prior to installation. Ive never had one out by more than a degree or 2 but its nice to know
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Old 2nd December 2006, 02:56 PM
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Whilst not LR, for the record, the Falcon 6 cylinder runs at 118c at half guage on a moderate day.

My XR6 regulary reached 128-130c and was well within design perameters.
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Old 2nd December 2006, 03:03 PM
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With the stat on the D1 set at 88 Deg C, I would have thought that normal op temp would be over 110 Deg C in my view.

..................but I'll check - I have a few high quality (+/- 0.05 Deg C) thermistors, and will let you know.
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Old 2nd December 2006, 03:07 PM
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Fantastic. Thanks for the quick replies. I was a little concerned after spotting a little coolant which had come out via the expansion tank. Thanks again
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Old 2nd December 2006, 03:16 PM
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Just checked using two channels on a Grant Squirrel data logger, using thermistors - and it is reading 105.2 Deg C on both - the ambient was recorded at 27.4 Deg C

Mine is a D2 - but there's very little difference with the D1
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Old 2nd December 2006, 07:47 PM
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I'll stand corrected I was going off of my old 3.9 disco, used to hover the 100 mark at idle and work up to about 115 at full steam full loads. the panic light used to come on at about 125-130ish from memory.
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Old 2nd December 2006, 09:21 PM
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Mine sits on 80.
It gets to 90/95 on 35+ degree days.

In the sand I see 95/100, and I start to panic (a little).

From memory, the boiling point is around 120 degrees (under pressure) so these figures you guys are quoting are quite high.
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