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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 09-23-2010, 01:45 AM   #1 (permalink)
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Bubbles in Radiator

So the other day, while I had a couple friends helping me look at the car we opened the radiator reservoir cap and turned on the car and let it heat up. After it had heated up, my friends noticed that when we reved the engine there were air bubbles being produce in the reservoir tank. What could be causing this? My friends think it's a head gasket. But what are the signs of a blown head gasket? I have a 1991 318i. I'm a poor college kid so you can guess how much I'm praying this isn't a head gasket. Thanks
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Old 09-23-2010, 09:14 AM   #2 (permalink)
OMFG another one!?
 
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Are there signs of oil in the coolant or the reverse?
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Old 09-26-2010, 01:13 PM   #3 (permalink)
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Are there signs of oil in the coolant or the reverse?
What would my oil look like if I had coolant in it? I figure if my coolant had oil in it it would make it darker looking? I'm not too sure.
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Old 09-26-2010, 02:39 PM   #4 (permalink)
OMFG another one!?
 
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Oil may look milky, coolant may have little globs of oil floating in it.
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Old 06-03-2011, 08:17 PM   #5 (permalink)
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I had bubbles in my radiator after a blown head gasket. I didn't see any oil or other stuff in the coolant, just the bubbles. It looked a lot like the bubbles in this video.

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Old 06-04-2011, 07:59 AM   #6 (permalink)
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That looks more like an air leak near the heater matrix or there abouts... Maybe a perished heater pipe or slightly loose connection, or even a goosed matrix...
If it was head gasket it would probably spit out more !!
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