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Discussion Starter #1
I've been using some coolant and I am trying to trade the source. I;m not sure its the radiator at this stage, but it might be the little ball thing that is at the corner of the engine connected to one of the overflow coolant tank pipes, then goes off two pipes round the engine. There appears to be some seepage around the middle seem.

So I have been topping up the fluid, and I have noticed a couple of times the water temp creeps up a little over 90c, which is fine, but the oil gets up to about 115c, is that ok or too high?

also my ommissions fault I had a few weeks ago has self cleared too. Took her for a run today and seemed faultless, apart from the 115c, but I was driving like a twat trying to get some temp in the engine/exhaust.
 

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407s seem to be fitted with an 83 degree thermostat rather than the usual 90.

During normal operation my water is usually about 83 and the oil between 90 and 100, measured using FAP app. The guages, however, do not move: they are not accurate.

Which engine do you have?
 

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Discussion Starter #3
407s seem to be fitted with an 83 degree thermostat rather than the usual 90.

During normal operation my water is usually about 83 and the oil between 90 and 100, measured using FAP app. The guages, however, do not move: they are not accurate.

Which engine do you have?
I've got the 2.7hdi. My gauges most definitely fluctuate a bit. The first time I noticed it was over last summer, stuck behind a queue traffic going over a steep hill behind some bint that wouldn't pull over. We were doing about 25kmh for about 20 minutes and the oil and water temp both rose, but dropped once got up to normal speed again.

In normal driving now, the water might go slightly over 90, nothing to worry about, but the oil, being about 115c does seem high. I might try measuring it in Carista and see what the actual reading is then.
 

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Oil should be above 105c otherwise you run the risk of not getting the moisture out. It's why start/stop driving without getting the engine up to temperature is bad. About 140-150c, that's when I would worry.
 

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Gathered some statistics today.

On the oil:

90 on the gauge is 75 on the diagnostic
90 + 1.5 marks on the gauge is 79 on the diagnostic
90 + 2 marks on the gauge is 81 to 87 on the diagnostic
90 + 2.5 marks on the gauge is 92 on the diagnostic

During a regen the oil on the diagnostic gets up to 100 but the gauge doens't move from 90 + 2.5.

IIRC a mark is 16 and two thirds so 90+2.6 is about 123.
 

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Discussion Starter #6
Gathered some statistics today.

On the oil:

90 on the gauge is 75 on the diagnostic
90 + 1.5 marks on the gauge is 79 on the diagnostic
90 + 2 marks on the gauge is 81 to 87 on the diagnostic
90 + 2.5 marks on the gauge is 92 on the diagnostic

During a regen the oil on the diagnostic gets up to 100 but the gauge doens't move from 90 + 2.5.

IIRC a mark is 16 and two thirds so 90+2.6 is about 123.
thats interesting, thanks. I don't have PP, but I do have Torque and Carista. I can't get oil temp on mine unfortunately, only coolant, and it is pretty close. I did peak at 95c yesterday, but once moving again it dropped quickly, although the fan probably came on then too. I don't know what temp the thermostat comes on though.

However, something that is of concern, I have a leak, although not from the radiator I don't think, I am trying to work out where from. Some is coming from a round valve thing at the front of the engine, but not enough to account for volume I am losing, so I need to check some other pipes as there is some on the side of the engine, but it gets sprayed everywhere by the serpentine belt.
 

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Discussion Starter #10
Coolant leak on 2.7HDi? Thermostat housing.
yeah, I did some tracing and it appears as though it is coming from the end of the elbow on the housing, not the housing itself. Is that normal?

Either way, I think I need a new one. I noticed whilst refitting the hose the end was crumbling off back into the elbow, not good for a cooling system.
 
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