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Old 11-06-2018, 09:00 PM   #1
bidderman1969
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coolant loss

ever since the car had its 100K service, the coolant and oil levels have never been right, after they over filled every level i had, i had to take it back to them to put it right. i know that can't be the reason, but its just strange that the coolant never went down before, and the oil always seems to be too high, I've just drained nearly 2 litres out of it!!!

the coolant loss baffles me, as there doesn't see to be any obvious leaks anywhere, however, my dad was discussing stuff with my uncle, and he said he had the same problem on his Deawoo thingy, and turned out to be the EGR valve???? is that even possible????
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Old 11-06-2018, 09:22 PM   #2
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If the coolant level is down and the oil level is up then it would seem like the coolant is getting mixed with the oil in the engine somehow. Have you noticed any change in the running of the engine or white smoke etc, residue in either fluids or gunk on the oil cap? Damage can occur if an engine has been overfilled with oil.
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Old 11-06-2018, 09:34 PM   #3
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Checked all that out, first thing I thought it might be, no white gunk in cap or dipstick, the oil I have taken out I shall keep to one side and see if any oil water separation occurs, hence why I’m looking at more complicated answers
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Old 11-06-2018, 09:56 PM   #4
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Yes it can be the EGR cooler ( strange name as technically it's a warmer ) it is used on diesel engines to increase the speed that the engines warm up by running the exhaust gases though a heat exchanger to the coolant these can develop hair line cracks allowing the coolant to seap though it is a common problem on bmw I work on though you don't see smoke from the exhaust but if you remove the valve it's self you can see the residue of the coolant being burnt

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Old 11-06-2018, 11:04 PM   #5
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Yes it can be the EGR cooler ( strange name as technically it's a warmer ) it is used on diesel engines to increase the speed that the engines warm up by running the exhaust gases though a heat exchanger to the coolant these can develop hair line cracks allowing the coolant to seap though it is a common problem on bmw I work on though you don't see smoke from the exhaust but if you remove the valve it's self you can see the residue of the coolant being burnt

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So I'm guessing there's no way to check unless you take it apart?
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Old 11-06-2018, 11:31 PM   #6
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Have you had it pressure tested ? how quickly is water disappearing ? a 330d will drop an inch over 200 miles. If its not losing much it might just be a leak.
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Old 11-06-2018, 11:32 PM   #7
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So I'm guessing there's no way to check unless you take it apart?
That right I'm afraid

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Old 11-06-2018, 11:34 PM   #8
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Quote:
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Have you had it pressure tested ? how quickly is water disappearing ? a 330d will drop an inch over 200 miles. If its not losing much it might just be a leak.
Not yet, dips to under "L" every fortnight at least, hard to judge when you do loads of different miles every week
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Old 12-06-2018, 01:58 PM   #9
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holy f&*£ a duck, checked with a kia garage about this (didn't fill me with confidence as first he said, no its your air-con leaking, then i explained its coolant going down, and he said, no, not the ego blah blah blah, then said hang on, i'll have a look at the diagrams, ...... oh yeah, you have a cooler on there, £410 plus Vat, or you can get one with a new EGR on it, total of £1004


























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Old 12-06-2018, 10:13 PM   #10
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The only true way to prove if it is that is to bypass it As its only one hose in one out, and you shouldn't have to worry about it getting up to temp in this weather , then run it for a couple of weeks

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