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E34 (1989 - 1995)

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  #1  
Old 07-02-2012, 11:21 PM
magusat999 magusat999 is offline
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Mein Auto: 1994 BMW 525i
Exclamation Yet another cooling problem... E34

My 1994 BMW 525i's cooling problem just turned into a mystery for me - maybe someone has some advice on how I should proceed from here? It started with the car spitting up coolant when I parked after driving and progressed to overheating.

I checked radiator, waterpump, recovery tank, radiator bleeder screw, and thermostat housing - no leaks from there. I changed hoses, thermostat, sealed the t-stat housing (just in case) because it looked like the radiator fluid was cascading from the housing at first. I also did bleeding like I am supposed to. But even though the car performed a little better, after driving about three miles and parking it the "COOLANT LEVEL +" warning came on and yet again I saw leakage, but I also saw a spray pattern on the back upper side of the passenger side radiator hose (a few inches from the tstat housing going down the engine facing side of the hose about 5 inches). This "spray" could would be impossible to come from the tstat housing - so what could it be? Whatever it is, it's coming from somewhere in the front of the engine, but I am having an impossible time finding it.

Is there a hidden hose? Is there a bleeder screw? Could it be coming directly from the engine block? (Coolant and oils are clean)? What else could it be, spraying coolant from that area???



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  #2  
Old 07-03-2012, 07:26 AM
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1995i540 1995i540 is offline
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That does not sound like a leak you either have extreme pressure in the coolant line (headgasket?) or thermostat got stuck in closed position.
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  #3  
Old 07-03-2012, 08:05 AM
magusat999 magusat999 is offline
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Quote:
Originally Posted by 1995i540 View Post
That does not sound like a leak you either have extreme pressure in the coolant line (headgasket?) or thermostat got stuck in closed position.
Wouldn't bleeding the system take care of the pressure? And its a new thermostat so I don't see how it would be that. There is a spray of coolant on the hose - as I described - which could not come from the tstat area, so I can't see it having anything to do with the thermostat.
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  #4  
Old 07-03-2012, 10:54 AM
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1995i540 1995i540 is offline
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I assume you bled it, you have two issues leak and overheating I'm not sure what you are asking? Are you asking if you have a leak and for us to know from where it's leaking?
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Last edited by 1995i540; 07-03-2012 at 10:55 AM.
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  #5  
Old 07-03-2012, 07:26 PM
japbike736 japbike736 is offline
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I'm guessing the head gasket has givin up on it. Do a compression check....
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  #6  
Old 07-03-2012, 09:29 PM
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luckydog luckydog is offline
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Just looking at the engine bay I can tell the car is neglected. Plan on a $500 cooling system over haul.
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  #7  
Old 07-04-2012, 12:22 AM
magusat999 magusat999 is offline
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Quote:
Originally Posted by luckydog View Post
Just looking at the engine bay I can tell the car is neglected. Plan on a $500 cooling system over haul.
Sorry it's not so pristine looking but I just started to get to work on it. I've been spending a lot of my time praying I would not have to go under the hood, but my fortunes have been down lately and that's the only reason I'm becoming a weekend grease monkey. I have been doing the minor stuff (oils, fluids, etc.) but the car was running so well I was surprised by this development. It's totally out of left field!

But looking in there (finally) I have to agree that it isn't so pretty... I was thinking about the thermostat housing that I had pulled off of the car and while shopping at an auto parts store I saw Block Sealant on the shelf. I remember there was this strange, thin, hard coating on the inside of the thermostat, and now I think I may have been taken in by the seller of this car. If I am not mistaken, that was the remains of some sort of block sealant - which means someone tried to hide a problem! Sure, the sealant worked up until now, but evidently it wore off and the original problem is back.

What I was wondering here is if there is coolant spraying from the front of the engine area, and it is not the thermostat / housing, waterpump, or any hoses (I addressed all of those already) - then what else could it be? To reiterate, it is spraying behind the hose I pointed out in my pics.
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  #8  
Old 07-04-2012, 12:52 AM
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M540FELLA M540FELLA is offline
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Block sealant would probably be hiding a cracked head my friend.... compression test it like mentioned
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Last edited by M540FELLA; 07-04-2012 at 12:55 AM.
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  #9  
Old 07-04-2012, 05:33 AM
BMWGIRL BMWGIRL is offline
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Mein Auto: 1992 BMW 525IX SE TOURER
I have a 1992 525ix, mine was down to 2 head bolts snapped so it had a full overall, i.e. New gaskets, new bolts,head skimmed,polished values, etc as its my pride and joy it cost a bit but it was worth it she now runs like a new car.

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  #10  
Old 07-21-2012, 05:53 PM
magusat999 magusat999 is offline
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Mein Auto: 1994 BMW 525i
I took the car to a mechanic and he told me it was indeed the waterpump. I feel really stupid now because that's the first thing I thought it was, until I pulled the waterpump out which at that point looked brand new! He said the bearings were worn out on it. I guess I had no clue, because I couldn't tell when I checked it - and returned the new waterpump to the shop! DUHHHH!!!

Well thanks for helping - if that's all it is then I'll be one happy camper to see that mystery solved (and fixed).
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  #11  
Old 07-21-2012, 07:07 PM
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goosefoot33 goosefoot33 is online now
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Keep us updated on if it was the water pump or something else- it will give me hope that any cooling problem (including mine) can be solved!
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  #12  
Old 11-25-2012, 03:55 PM
MikeyBabii MikeyBabii is offline
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Mein Auto: 92 BMW 525i
My 92 525i has the same problem... Have you found out the issue?
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  #13  
Old 06-12-2013, 08:39 PM
magusat999 magusat999 is offline
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Quote:
Originally Posted by MikeyBabii View Post
My 92 525i has the same problem... Have you found out the issue?
It was the water pump, but the liquid splashed all over the alternator and took that out too, so I had to replace both. I know this took a long time, I've been through some personal difficulties since then, but I feel incomplete not answering this.
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