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E34 (1989 - 1995)

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  #1  
Old 03-16-2013, 09:58 PM
jeepbmt jeepbmt is offline
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Location: Vietnam
 
Join Date: Aug 2010
Posts: 35
Mein Auto: BMW E34 M50
Overheat again, plz help me!

sorry 'bout my english,
My E34 525i has overheat again. I've replaced somethings, new radiator with new cap, new water pump and themostat, new engine oil and coolant fluid, new fan clutch and aux cooling fan...But today she's still got red lvl in gauge. So I'll tell you the expression.
1. when the car take normal temp (middle gauge) at idling : no air buble in bleed screw. I feel the fluid flow in the radiator and hose. The top hose is hot and the lower is little warm.
2. When I run her about 10kms (with A/C on and off), The Temp gauge get RED, the top hose so hot and bulge. The lower hose keep warm. Coolant level in expand tank standstill. If I bleeding air, I feel it blow air like boil. I'm sure no more bleeding air before. I turn off the engine and wait about 1/2 hour, temp return to normal. And It's got RED for 10 kms running again...

I've tried to bleed air again and again, many many time. No white smoke in exhaust, no oil in fluid and no water in oil. I think she's not blown head gasket.
So plz tell me your idea about it. Thanks alot, my dear,
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  #2  
Old 03-17-2013, 03:39 AM
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DanM5 DanM5 is offline
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Location: Perth, WA
 
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Mein Auto: 535is-m
Mine was doing the same thing even with new parts! I tried everything and it ended up being a faulty thermostat.. Even though it was new! Try removing the thermostat and if that fixes it you know you got a faulty thermostat too!! That was just my experience after I tried everything else suggested by members on this forum
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  #3  
Old 03-17-2013, 05:29 AM
kmorgan_260 kmorgan_260 is offline
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Mein Auto: 1997 528i
I've had this problem several times on M42, M50 engines and it was always caused by airlock. It is tricky to get all the air out of the system. One thing that worked for me was to take the cap off the expansion tank and run the car while you watch for the thermostat to open. Once fluid starts to flow put the cap on and turn it off. Let it set for a couple of hours and check the level. Add if necessary. Take it for a short dirve and watch the temp gauge. You may have to repeat this a few times.
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  #4  
Old 03-17-2013, 08:10 PM
jeepbmt jeepbmt is offline
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Location: Vietnam
 
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Mein Auto: BMW E34 M50
Thanks all,
But I think it's blow H/G. I try to bleed coolant circuit in Idle, no more air buble flow. And try it again and again...But after 10 km running with rough, there's alot of air in coolant. I've tested many times, so now I'll testing and replace H/G. Follow post...
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  #5  
Old 03-18-2013, 01:33 AM
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DanM5 DanM5 is offline
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Location: Perth, WA
 
Join Date: Feb 2013
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Mein Auto: 535is-m
I do not think its your h/g unless you drove it until it got into the red on the gauge and then continued to drive it..! Replacing your head gasket is your last resort, check everything else, just as I was told to do by other forum members.. You might be surprised with what you find
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  #6  
Old 03-18-2013, 08:09 AM
E34_Obsession E34_Obsession is offline
"The sound of the M50"
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When the car is cold, fill the tank to the top. Then open bleed screw and start the car. Let it warm up just a little bit, then shut it off. If the level has gone down then you were low on coolant. Fill again, start car, bleed system until no more air is left. Repeat this process until you have a steady flow of coolant. I will post a video on youtube on how to do this.
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1991 BMW E34 525iA

1999 Toyota Tacoma Prerunner Xtracab 2.7L

2008 Toyota Tacoma Prerunner DCSB TRD Sport

1995 Toyota Tacoma 2WD DX V6 - SOLD

1992 Toyota Pickup - SOLD

2003 Subaru Forester 2.5X - TOTALLED

2004 Subaru Forester 2.5XT - SOLD

2005 Subaru WRX Sedan - SOLD
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  #7  
Old 03-18-2013, 08:10 AM
E34_Obsession E34_Obsession is offline
"The sound of the M50"
Location: Illinois USA
 
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Mein Auto: Look in my Signature :P
Yes it is air lock.
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1991 BMW E34 525iA

1999 Toyota Tacoma Prerunner Xtracab 2.7L

2008 Toyota Tacoma Prerunner DCSB TRD Sport

1995 Toyota Tacoma 2WD DX V6 - SOLD

1992 Toyota Pickup - SOLD

2003 Subaru Forester 2.5X - TOTALLED

2004 Subaru Forester 2.5XT - SOLD

2005 Subaru WRX Sedan - SOLD
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  #8  
Old 03-22-2013, 08:12 AM
Bull City BMW Bull City BMW is offline
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Mein Auto: 1999 528I
Had this problem as well, did not let it overheat, but kept adding coolant until it worked itself out
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  #9  
Old 04-02-2013, 11:25 AM
jeepbmt jeepbmt is offline
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Location: Vietnam
 
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Mein Auto: BMW E34 M50
thanks all! I've changed my head gasket and everything's ok. Thanks anyway
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  #10  
Old 04-03-2013, 07:55 AM
E34_Obsession E34_Obsession is offline
"The sound of the M50"
Location: Illinois USA
 
Join Date: Nov 2012
Posts: 78
Send a message via ICQ to E34_Obsession Send a message via Skype™ to E34_Obsession
Mein Auto: Look in my Signature :P
Good to hear you got it back up and running.
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1991 BMW E34 525iA

1999 Toyota Tacoma Prerunner Xtracab 2.7L

2008 Toyota Tacoma Prerunner DCSB TRD Sport

1995 Toyota Tacoma 2WD DX V6 - SOLD

1992 Toyota Pickup - SOLD

2003 Subaru Forester 2.5X - TOTALLED

2004 Subaru Forester 2.5XT - SOLD

2005 Subaru WRX Sedan - SOLD
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