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1997 Z3 BMW radiator or water pump leak


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marz16
Novice

Jan 6, 2017, 10:30 AM

Post #1 of 10 (883 views)
  post locked   1997 Z3 BMW radiator or water pump leak  

A few months ago my dad helped me replace the radiator in my 1.9L Z3 BMW because it was leaking along the junction between the plastic and metal parts. I haven’t driven the car much at all since then, but today I drove about 4 miles and the engine started to overheat. I stopped to open the hood and noticed that coolant seemed to be leaking out of the closed reservoir cap. I could hear sizzling noises coming from the cap. When I got home, I noticed that almost all of the coolant was gone from the reservoir (it was filled about halfway when I first stopped). Could this be a water pump issue? Alternatively, I have the reservoir cap from the previous radiator on the new radiator because the new one did not come with one. Could this be an issue with the cap not sealing completely? Do you have advice on where else the leak could be coming from and how to solve this issue?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 6, 2017, 12:50 PM

Post #2 of 10 (874 views)
  post locked   Re: 1997 Z3 BMW radiator or water pump leak  

The engine started to overheat and then you drove it home to check it? ............................... not real smart.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



marz16
Novice

Jan 6, 2017, 1:33 PM

Post #3 of 10 (863 views)
  post locked   Re: 1997 Z3 BMW radiator or water pump leak  

I waited for the engine to cool down before driving again- took about 20 min. I had to stop several times and repeat that process. I was a few miles away from home.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 6, 2017, 1:36 PM

Post #4 of 10 (858 views)
  post locked   Re: 1997 Z3 BMW radiator or water pump leak  

That's good. Are you sure the system had coolant and didn't freeze?



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



marz16
Novice

Jan 6, 2017, 4:16 PM

Post #5 of 10 (850 views)
  post locked   Re: 1997 Z3 BMW radiator or water pump leak  

I added coolant to the system when I initially stopped, but the reservoir was almost empty by the time I got home.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 6, 2017, 4:19 PM

Post #6 of 10 (847 views)
  post locked   Re: 1997 Z3 BMW radiator or water pump leak  

No, I'm talking about before any of this happened, when you replaced the radiator. Did you fill it with water or coolant then?



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



marz16
Novice

Jan 6, 2017, 7:50 PM

Post #7 of 10 (834 views)
  post locked   Re: 1997 Z3 BMW radiator or water pump leak  

Yes, I added coolant when I replaced the radiator. I didn't open the air escape valve though at the time. Do you think that is part of the problem?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 6, 2017, 7:54 PM

Post #8 of 10 (829 views)
  post locked   Re: 1997 Z3 BMW radiator or water pump leak  

Just looking for the possible cause of the overheating. You probably still had air pockets in the system.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



marz16
Novice

Jan 7, 2017, 4:02 PM

Post #9 of 10 (802 views)
  post locked   Re: 1997 Z3 BMW radiator or water pump leak  

It turns out there is a defect at the bottom of the reservoir, which is causing the leaking. Thank you for the help.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 7, 2017, 4:05 PM

Post #10 of 10 (799 views)
  post locked   Re: 1997 Z3 BMW radiator or water pump leak  

OK, glad to hear you found the problem. We will close this now as solved.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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