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Old 12-26-2012, 08:29 AM   #1
cc1080
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Coolant Lost

Hi all, I am new here. I want to share the captioned with you all.

I was experiencing coolant lost since early November 2012. Afterwards, the heater inlet pipes were replaced followed by the radiator and all the hoses with the expansion tank. At the time, the coolant lost seems to be under control. Notwithstanding, until early this week, coolant lost again and I have to pour around 800 ml coolant every day.

Today I bought the car to the shop and had them replace the thermoset and water pump. When the old thermoset was off the engine, I was shock. The head where the thermoset mounted is corroded badly. See the pictures. The shop need to apply some liquid gasket to around the thermoset and try to stop the leak in the future.

Prior to the replacement of the new thermoset, the car usually ran with temperature from 105 c to 110 c (it is a bit high). And now, the temperature will not even go over 97 c even in the traffic.

I changed the thermoset around 2 years ago with 70000 km on it. I am shock how the thermoset could only last this short period of time and this mileage.

I really would like to know how to deal with the above corrosion.
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Old 12-26-2012, 08:34 AM   #2
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Pictures of the old thermoset

see the picture.
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Old 12-26-2012, 08:38 AM   #3
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What kind of fluid did you use?
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Old 12-26-2012, 08:54 AM   #4
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What kind of fluid did you use?
+1

Poor engine

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Old 12-26-2012, 09:28 AM   #5
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WOW - this looks like someone has been running tap water through cooling system.

BMW coolant and distilled water 50/50 is the way to go.
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Old 12-26-2012, 09:35 AM   #6
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Some things cannot be unseen.

OP: change your coolant as someone said above using genuine BMW coolant and distilled water ONLY.

Also see sig, cooling thread. Replace anything that hasn't been replaced yet. Hit the back button, see sig again, do it all!

And welcome to the forums.
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Old 12-26-2012, 10:22 AM   #7
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Must be the water in Hong Kong!

Did you use BMW thermostat?
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Old 12-26-2012, 10:47 AM   #8
cc1080
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coolant

I was disappointed to see how bad the corrosion is. By the way, I use BMW coolant with distilled water 2 years ago when I replaced the thermoset. However, since the coolant leakage occured, I add tap water though and this is the reason for the corrosion ?.. I underestimate the power of tap water ...

Just want to share this and watch out your cooling system..
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Old 12-26-2012, 10:48 AM   #9
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Quote:
Originally Posted by cc1080 View Post
I was disappointed to see how bad the corrosion is. By the way, I use BMW coolant with distilled water 2 years ago when I replaced the thermoset. However, since the coolant leakage occured, I add tap water though and this is the reason for the corrosion ?.. I underestimate the power of tap water ...

Just want to share this and watch out your cooling system..
Yes.

Also keep in mind it's not good enough to "use BMW coolant and distilled water." By "using" you really mean adding. You are basically adding good stuff to the bad stuff.

The proper way is to flush out all the bad stuff and extract every last drop before adding the good stuff. that way you have 100% good stuff (give or take a 10th of a percent)
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Old 12-26-2012, 11:36 AM   #10
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D: that looks like the coolant was never ever ever changed. Doesn't last forever! Flush the system really well with some cooling system flush stuff. You can find it at auto parts stores. Then get BMW coolant or Zerex G-05 and change it every 2 years.
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Old 12-26-2012, 12:20 PM   #11
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Quote:
Originally Posted by cc1080 View Post
I was disappointed to see how bad the corrosion is. By the way, I use BMW coolant with distilled water 2 years ago when I replaced the thermoset. However, since the coolant leakage occured, I add tap water though and this is the reason for the corrosion ?.. I underestimate the power of tap water ...

Just want to share this and watch out your cooling system..
Yes, it is, you keep adding tap water to it, and knowing that tap water in Hong Kong is extremely bad and sometimes may contain some forms of salt water thus resulting the corrosion that you had.
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Old 12-26-2012, 02:18 PM   #12
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Using tap water is a no no. It's a shame that the tap water in Hong Kong will do that to a BMW. Now you know to always use BMW coolant (or Zerex G-05) and distilled water in a 50/50 mix. As others have written the system ought to be cleaned. Good luck.
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Old 12-26-2012, 02:20 PM   #13
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Quote:
Originally Posted by Chris C View Post
Using tap water is a no no. It's a shame that the tap water in Hong Kong will do that to a BMW. Now you know to always use BMW coolant (or Zerex G-05) and distilled water in a 50/50 mix. As others have written the system ought to be cleaned. Good luck.
+1

If anyone wants to step up against this, do so now.

Otherwise we can all agree to never use tap water again.
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Old 12-26-2012, 03:08 PM   #14
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Tap water definitely cause that corrosion.
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Old 12-26-2012, 05:13 PM   #15
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Not all tap water will cause corrosion, The Bay Area water system is pretty good, I have been using tap
water with 50/50 coolant mix in my Honda, Buick, Jaguar, Land Rover, Toyota, Lexus and BMW with no issues, no corrosion whatsoever, and one more thing, Prestone coolant is what I used mostly and I flush the system every 3 years. You believe what you believed, but that's what I have been using with no problem.

Last edited by taibinhvuong; 12-26-2012 at 05:24 PM.
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Old 12-26-2012, 05:19 PM   #16
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Quote:
Originally Posted by taibinhvuong View Post
Not all tape water will cause corrosion, The Bay Area water system is pretty good, I have been using tape water with 50/50 coolant mix in my Honda, Buick, Jaguar, Land Rover, Toyota, Lexus and BMW with no issues, no corrosion whatsoever, and one more thing, Prestone coolant is what I used mostly and I flush the system every 3 years. You believe what you believed, but that's what I have been using with no problem.
$1 for peace of mind. Too much to ask?

BTW, it's tap, not tape.
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Old 12-26-2012, 05:35 PM   #17
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Quote:
Originally Posted by cc1080 View Post
I was disappointed to see how bad the corrosion is. By the way, I use BMW coolant with distilled water 2 years ago when I replaced the thermoset. However, since the coolant leakage occured, I add tap water though and this is the reason for the corrosion ?.. I underestimate the power of tap water ...

Just want to share this and watch out your cooling system..
Radiator and heater core will be leaking pretty soon.
Thermostat for transmission cooler in the expansion tank is probably gone too. Multiple flushes and complete cooling system overhaul is in order.
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Old 12-26-2012, 05:46 PM   #18
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Distilled water is $.70 at Wal-Mart.

Why risk it?
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Old 12-26-2012, 06:54 PM   #19
cc1080
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Flushing cooling system

Quote:
Originally Posted by dslboomer View Post
Radiator and heater core will be leaking pretty soon.
Thermostat for transmission cooler in the expansion tank is probably gone too. Multiple flushes and complete cooling system overhaul is in order.
Hi, what kind of fluid do I flush ? Thanks.

By the way, I replace everything except the heater core.

And it is very strange that the corrosion only occur on the inlet of cooling water from the radiator of the head whereas outlet side is coated all over with white substance.
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Old 12-26-2012, 07:03 PM   #20
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Originally Posted by taibinhvuong View Post
Not all tap water will cause corrosion, The Bay Area water system is pretty good, I have been using tap
water with 50/50 coolant mix in my Honda, Buick, Jaguar, Land Rover, Toyota, Lexus and BMW with no issues, no corrosion whatsoever, and one more thing, Prestone coolant is what I used mostly and I flush the system every 3 years. You believe what you believed, but that's what I have been using with no problem.
All tap water will cause corrosion. The reason why u had success because coolant has anti corrosion inhibitors that prevent oxidation of the metal.

As for the OP, he was basically running pure tap water. All those times he keep topping off his cooling system, the coolant got more dilluted and dilluted.

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