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E30 (1982 - 1993)
God's Chariot. The E30 was produced primarily from 1982 through 1991. The cabriolet was the one exception which was produced through 1993.

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  #1  
Old 11-10-2012, 09:36 AM
E30949/909 E30949/909 is offline
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sludge in coolant

Small amount of sludge in expansion tank on fill line. 90 325i stock.
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  #2  
Old 11-10-2012, 10:05 AM
E30949/909 E30949/909 is offline
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Here is some pics of the sensor pulled out
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  #3  
Old 11-10-2012, 04:49 PM
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downhiller downhiller is offline
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typical if you use tap water to mix with the coolant.

i would recommend doing a coolant flush. cause whats one the sensor, is in the block in the radiator and anywhere else the coolant flows.
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Old 11-10-2012, 05:08 PM
E30949/909 E30949/909 is offline
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Just did timing, water pump, thermostat, an flush. Seems to over heat still. That's why I asked that thought that might be oil in the coolant so blown headgasket witch is why I over heat. Could it be a bad radiator?
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  #5  
Old 11-10-2012, 06:43 PM
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Well if tou have just did all of this work. And you flushed the ENTIRE SYSTEM out thoroughly. Then (and only then) should a blown HG be suspect.
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Old 11-10-2012, 09:01 PM
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What condition is your rad in? Does it have holes, smashed in fins and such? Could be your problem.
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Old 11-11-2012, 07:26 AM
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Quote:
Originally Posted by First time View Post
Well if tou have just did all of this work. And you flushed the ENTIRE SYSTEM out thoroughly. Then (and only then) should a blown HG be suspect.
he didnt change the fan clutch, so he still has a couple options.

check the fan clutch. easy way i did it was get the engine up to op temp, shut off and try spinning the fan by hand, should have a resistance. or you can do the newspaper test. roll it up and jam it in there while the engine is running.
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Old 11-11-2012, 03:59 PM
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Oh an forgot to mention I did change the fan clutch. My radiator is prob the stock one from 89/90 and no damage to it all. Could always be clogged internally tho with junk. Could it still have air in the cooling system?
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  #9  
Old 11-11-2012, 04:47 PM
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Air in the coolant would explain the car overheating but it would not explain the sludge.

If the radiator is original, i would place a bet that the sludge is in their.
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  #10  
Old 11-11-2012, 04:47 PM
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Air in the coolant would explain the car overheating but it would not explain the sludge.

If the radiator is original, i would place a bet that the sludge is in there.
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  #11  
Old 11-11-2012, 04:47 PM
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Sorry double post.
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  #12  
Old 11-11-2012, 05:20 PM
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Yea thats what I figured. This guy I was talking to was saying radiator also. I will replace that then since that's all that's left on the list besides the head. Is there any other way to bleed the air out in the cooling system other then the screw on the thermostat housing?
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  #13  
Old 11-11-2012, 09:40 PM
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nope. I believe that is correct way to bleed the system. Hopefully the new radiator will solve you problems.
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  #14  
Old 11-12-2012, 05:01 PM
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BMWFatherFigure BMWFatherFigure is offline
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Your radiator shop guy will be able to ID oil sludge / HG problem from your old radiator. Try a 1/16" hole on the flange of the 'stat and orient that at the top. It will aid bleeding a lot.
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