Causes for antifreeze in oil, '90 80 4cyl
So, replaced that plastic valve today and filled up the radiator and coolant reservoir and started it up. When I start the car the reservoir tank overflows, spews even. I let it blow out all the fluid it wanted to, figuring I'd just overfilled it. The car died after about 30 seconds of this. Tried it a couple more times. Each time, the car started with the reservoir empty, it filled quickly after I started it then promptly spewed everywhere.
After 2 or 3 tries at this, figured I'd hooked something up wrong. All hoses seem to be in the right places, but I'm noticing water/antifreeze in the oil. Had only just changed it before all this, now is murky brown and kinda bubbly looking.
The only place I can see where the coolant could come into contact with the oil is the filter housing, where it seems a coolant line runs into, and then out of.
I only just bought the car, but I can see evidence that it was overheated pretty bad in the past. That plastic piece on the back of the head was trashed, as was the radiator that came with the car.
Short of there being something wrong in the filter housing, the only other thing I can think of is bad head gasket.
Checked compression after I put the timing belt on, found it to be fairly consistent across all 4 cylinders, except #2, which was about 25% lower than the rest .. 1,3,4 were at about 120, 2 was at about 90 ..
Not sure if that means anything ..
Thoughts?
Thanks in advance!
For your sake I hope I'm wrong... but then again, you could just put a 1.8T motor in there, couldn't you? ;-)
It might be a blown o-ring in the cooler; probably the whole cooler needs to be changed. Looked at the repair manual yet?
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When I got the car, the oil was black and not in any way contaminated by coolant. I can only assume that whatever happened to it has happened since I've had it. Drove it about a mile, replaced radiator, timing belt, valve cover gasket, rear plastic coolant fitting, some belts, CVs and a bunch of coolant hoses. Now suddenly I've got coolant in the oil.
So, it is possible then for a failure of this oil/coolant fitting to cause the two to mix?
I see that it looks easily un-boltable, will take that bad boy off tomorrow and see what it looks like inside.
Am willing to try almost anything; really don't care to pull the head off if I can help it.
Unfortunately, no repair manual

Haynes doesn't make one, nor does Chilton ..
Any suggestions as to another?
Thanks!
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