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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 08-31-2015, 09:56 AM
DReece_II DReece_II is offline
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Location: Toledo, OH
 
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Mein Auto: 2000 BMW 528i
Leaking Coolant

I have a 2000 BMW 528i that was overheating due to my radiator being cracked and the coolant was leaking out. I recently got a new radiator put in but it is still leaking coolant and overheating is there anything else I should look for?
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  #2  
Old 08-31-2015, 11:12 AM
Alika808 Alika808 is offline
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First thing you must bleed the system. Make sure you did the bleeding procedure correct because if there's air pocket in the system then it will overheat. Research in google and youtube the procedures. Also, check the fan function, the water pump and thermostat.
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Old 08-31-2015, 11:16 AM
Alika808 Alika808 is offline
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Recap, about the leak: can you visual see where the coolant coming from, if not then use the coolant pressure tester. The AutoZone and others have the tools loan program, you may borrow and sometimes their staff will show you how to use.
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Old 08-31-2015, 05:07 PM
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tim330i tim330i is offline
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I moved your question to the E39 5 series forum, you will get more help in here.

Tim
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Old 08-31-2015, 05:42 PM
bobdmac bobdmac is offline
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I hope you didn't drive the car while it was overheated. If so, you may have blown the head gasket. Inspect the engine compartment for white, powdery residue, left by evaporated coolant. This will help you find leaks. If you can find no residue, you need to determine whether or not the head gasket is blown, which you can do with a pressure test of the cooling system, as Alika808 recommended. Once you have fixed all the leaks, you need to bleed the system properly. There are good DIY's on the "very best links" sticky. Ultimately, you'll want to replace all the components of the cooling system. Look for DIY's on "Cooling system overhaul."
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Old 08-31-2015, 11:08 PM
Liamqrph Liamqrph is offline
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Location: Fremont, CA
 
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Mein Auto: '97 528i
Leaking Coolant

You may want to check all your hose clamps and make sure they're tight. When I overhauled my cooling system, I forgot to tighten the hose clamp underneath the expansion tank. Luckily I discovered it when I was refilling the coolant. Good luck!

Last edited by Liamqrph; 09-01-2015 at 12:34 AM.
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Old 09-01-2015, 08:29 PM
spoddye39 spoddye39 is offline
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The trouble with coolant leaks is the fan blows the coolant everywhere so it can be hard to tell where it's coming from. I recently had a leak - I thought it was the upper hose or radiator or maybe even the water pump, but when I took out the fan and shroud it turned out to be the thermostat housing was leaking. Since I didn't have a spare I just cleaned it all up and put it back together with RTV - worked like a charm. One of these days when I have it apart for something else I'll do it all properly.

Spod
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Old 09-02-2015, 10:13 AM
Liamqrph Liamqrph is offline
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Mein Auto: '97 528i
I'm definitely going back to the OEM plastic housing on my next coolant flush. The aluminum housing is just crap. I just did a cooling system mini-service with a new thermostat housing. A few weeks later I see some coolant leaking out through the metal. Although it's not spewing coolant all over the engine, it's annoying.



Last edited by Liamqrph; 09-02-2015 at 10:22 AM.
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