06-21-2021, 02:40 PM | #1 |
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Currently diagnosing oil in my coolant tank . "Low coolant" has come on 3x the last two days. No visible coolant or sludge on the oil cap. Did the OFHG and flush a few years ago, and no visible leakage anywhere at the front of the engine or near the cooler.
Recent maintainence was just the oil pan gasket (couple months ago) at an indy. Could this residue in the tank be an artifact from that work? I can't find the specific procedure for working on the oil pan gasket, so I've attempted to work backwards from "oil sump removal" and "replacing connecting rod bearings" in maintence docs. Doesn't look like "draining coolant" is required to remove the oil pan. Also can't find any diagrams for the coolant passages in the block. Am I looking at the OFHG again, or something worse ?
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06-21-2021, 05:19 PM | #2 |
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Worst case is blown head gasket. There's a kit which attaches to the cooling system. It contains a dye that reacts with hydrocarbons.
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06-22-2021, 06:46 AM | #4 |
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Pretty sure. The tank is pretty new as you can see. Radiator fan went out almost two years ago and a lower hose burst. Coolant was flushed that time and tank purchased new, liquid was blue. Prior to that OFHG around 55k. Car is at 85K now on an oe OFHG.
I'll dip a napkin in and see if I can a extract some of the liquid.
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06-28-2021, 09:25 AM | #5 |
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Definitely oil.
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06-28-2021, 09:40 AM | #6 |
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Yup, in the first post the second picture (of the cap) shows that milky residue that is unmistakable for coolant/oil mixture. Presence of that on the cap indicates a fairly significant contamination, unfortunately.
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06-29-2021, 03:06 PM | #7 |
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Yep. Hopefully the OFHG is pinched and letting oil into the coolant.
Let us know
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08-09-2021, 11:26 PM | #9 |
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Oil cooler thermostat gasket
hey all,
diagnosing the same problem here. oil in coolant tank. no coolant in oil. no indication that its a head gasket. previous owner said they did oil cooler gasket while doing the OFHG, but after I opened it up, it appeared that the gasket was changed however the old gasket material wasnt cleaned up properly around the coolant chamber... and it appears that there are marks indicating where the oil was pushed into the coolant chamber due to failure in the seal. can anyone confirm my logic here? also, any tips on how to get the mating surface cleaner? it feels pretty smooth. just used a toothbrush, cloth and brake cleaner. thanks in advance! |
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08-24-2021, 04:04 PM | #10 |
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I think it's the OFHG, i just replaced mine yesterday and when i bleed the cooling system there was oil in my reservoir. Now i have to take it apart again and also flush my cooling system. I think the gasket didn't seat correctly.
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08-24-2021, 05:09 PM | #11 |
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Just to update this I got the OFHG done again with a flush. Still expect some oil to appear after the flush as there are just too many places for it to hide.
Now the kicker, I was going through my docs for all the work that has been to the car over the years. Found the papers from the first time I had to do the OFHG. The shop notes they flushed the system bit it will definitely need another flush soon. I believe now that all the oil I found recently was just the remainder from the original work. It wa never flushed again in between as I never recalled to check again . So it seems like I payed for the OFHG to be done again when all I need was another good flush smh. Lesson learned.
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08-24-2021, 06:26 PM | #12 |
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So is oil in the coolant unavoidable with OFHG and therefore coolant flush required? I don't recall seeing that ever really mentioned in DIYs or anything.
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08-24-2021, 07:42 PM | #13 |
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It seems to be entirely dependant on how the gasket fails since oil and coolant passages are separated by the same gasket.
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09-16-2021, 08:34 PM | #14 | |
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Quote:
im still having oil get into the coolant tank. had the OFHG work done again, but still oil and shop said pressure building in the coolant tank. i think im screwed. will probably trade the car in. we just picked up the car a month ago... there was no oil in the coolant then and car drives fine. think we got f*cked over. |
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09-17-2021, 08:06 AM | #16 | ||
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Quote:
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09-18-2021, 10:19 AM | #17 |
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