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Old 30-08-2020   #1
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Question Oil in coolant, oil cooler part for 150hp JTD?

So, I have oil in my coolant reservoir. Mainly black, unmixed, but a tiny bit of mayonnaise under the coolant cap. Nothing in the oil, very slow leak, as it's been about 6 months with minimal change. No temp problems, no white smoke. I suspect the oil cooler. Problem is, FIAT eper disagrees with autodoc etc. on the part number of the oil cooler I need.

Eper says the heat exchanger for the 110KW 1.9 is 55207119, and this part can be found almost nowhere, and has list prices of 800-900. Autodoc and all the other sites they hide behind say I need 55180933 for 35, but that looks like it's about half the thickness of the one pictured in eper and has a different arrangement of pipes. Is the 552 one just an obsolete design, or is it because it's the 150hp sport variant it has rarer parts? That was the case with coil springs.

Anyone got some insight? Cheers.
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Old 29-01-2021   #2
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Re: Oil in coolant, oil cooler part for 150hp JTD?

Hello, I have a similar problem with the heat exchanger but worse !
More oil than water in the cooling system . Did you manage to find
out if the alternative part would fit? Any help would be appreciated.
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Old 01-02-2021   #3
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Re: Oil in coolant, oil cooler part for 150hp JTD?

I have same kind of little leak in petrol 150hp oil cooler. Leak seems to coolant=>outside. With grande punto 1.3 multijet ja sealed that kind of leak with oilpan-sealing paste. I quess that would be possible also with this cooler if it's not totally cracked.
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Old 03-02-2021   #4
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Re: Oil in coolant, oil cooler part for 150hp JTD?

Unfortunately it is an internal leak within the cooler the oil under pressure is getting into
the coolant.
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Old 07-02-2021   #5
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Ok, with 1.3 multijet leak was also "oil to coolant" and seals were like in this picture http://www.tinyurl.com/4d1gb68c

But if leak is inside bigger part of that module (cracks in metal etc.) It's different story.
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Old 10-02-2021   #6
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Re: Oil in coolant, oil cooler part for 150hp JTD?

Stbeauno well, I never got an answer, but when I went to change the coolant the other day I took out the reservoir to clean it and found the top inch of coolant was actually oil, so it's got worse. I've ordered a new oil cooler 55180933, arriving tomorrow. I'll let you know if it even fits, and if it works. I kind of suspect it won't without a new spigot, because the length of that is prob related to how thick the cooler is, as it's got to make a seal with the oil filter that screws into the other end. My guess is the Sport model has an uprated oil cooler to allow the car to deal with being pushed harder. If it's too short, I might just buy a new shorter spigot to go with it. It'd be a downgrade, but since I don't actually track my car, I'm sure a lower capacity oil cooler wouldn't cause any difference day to day.
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Old 28-02-2021   #7
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Re: Oil in coolant, oil cooler part for 150hp JTD?

Hi, any further update on this issue and did changing the HE resolve the issue?

I had a similar issue with my 1.9 Multijet (150 bhp - 6 speed)- I recently noticed black residue in the coolant reservoir - not oil, the residue settled on the bottom of the reservoir - anyway, wasn't sure what do do but my initial hunch was the oil mixing through the oil cooler - also, at the same time I somehow decided to change the timing belt and water pump as well - interestingly, when I uncovered the timing belt cover I could see the water pump pully wobble and had a lot of play plus lot of whitish residue around - I changed the pump, timing belt, bearing etc and drained and refreshed the coolant and cleaned the coolant reservoir as well - all good since and the coolant reservoir is clean - not very sure where the black residue came from at the first place and why it disappeared!! Car is running all fine - although I keep checking the reservoir just in case to monitor any color change again.
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