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Don’t forget to use the OBC in the instrument cluster to verify what you’re seeing with the needle. You don’t want to be chasing ghosts.
 

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Discussion Starter · #42 ·
My mechanic came today and he said its one of the hoses. Its one of the hoses you can see from the top of the engine cover below that area. It's leaking or has some type of clog, there's grime on the outside of the hose. He's fixing it in a few days since he has to get the hose from another bmw they have at his shop. He simply called it an "engine hose".

I also purchased a water pump will have that changed as well. I hope this fixes the problem.

I had another question, do you guys think its ok to drive this car long distances? Like road trips of 2 - 4 hours?
The car has about 220,000 miles on it.

Thanks.
 

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Discussion Starter · #43 ·
Issue solved with that hose replaced. It was a hose under the engine somewhere, he doesn't know the name of it but he used that tool where it blows air into the coolant intake cap area and he pinpointed the air coming out of one of the hoses.

Car is fine now.

Thanks.
 

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Discussion Starter · #45 ·
Another hose was replaced, apparently he did a coolant flush. Car was ok for like 4 days, now same problem arises. I put water in its ok for an hour then overheats again. Repeat , put water in its ok for a little while then same problem.
 

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You should find a non-dealer BMW specialist who understands the BMW cooling system - although it is not that different from any other car. But you can't have a mechanic give you back a car that then overheats. This is an all aluminum engine that really doesn't take an overheat well.
 

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The fan relay replacement solved the problem.
Issue solved with that hose replaced. It was a hose under the engine somewhere, he doesn't know the name of it but he used that tool where it blows air into the coolant intake cap area and he pinpointed the air coming out of one of the hoses.
Car is fine now.
Problem has returned, same issue.
Well, what else the mechanic is going to replace?
You asked for help and I gave advice in post #3 and #31, but you never followed up. So what is the point to come here and ask?
 

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The cooling system needs to be overhauled.
This.
Read both of these. Just do it.
Also, you should do the Temp gauge mod so you know if your engine might overheat. DIY: Changing Temperature Gauge Buffer Range with PA...
 

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Discussion Starter · #51 ·
I had someone else look at it today. He said its the coolant pipes from the block to the heater port. One of those 2 pipes. So yeah, just going to have them both replaced tomorrow.
 

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He said they are leaking.
Probably a little leak and not gushing out on the floor. If you don't see a puddle on the floor after parked it, then the little leak from these pipes cannot cause the overheated issue that you reported.

Something else was causing the overheat and not these piles. Something causing the coolant not flow through the radiator, and this is why I suggested to grab the lower hose in hand and feel how hot it is at operating temp.
 

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Discussion Starter · #55 ·
He opened it up and showed me. It was leaking alot. The water would hit the floor pan or other parts and just evaporate.
He replaced both hoses, and now the problem is solved. My heater is also working again.

Problem solved.

Thank you for your replies, and help. I really appreciate it.
 

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Discussion Starter · #56 ·
I do not know the name of those 2 hoses, if someone can post it here for future reference would be great. There were 2 of them.
 

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Discussion Starter · #58 ·
Yes thanks, that number 8 hose and there was another one. The 2nd one he replaced because it looked like it was wearing out. The main one with the leak was the number 8 house in the diagram. Its interesting because when that one leaks, the water gets evaporated because of the heat in that area and on the parts. Thus the leak can be hard to pinpoint. Also my other mechanic had patched up the number 8 hose with silicon before, so he thought it was not that one, when it actually turned out it was. I was putting water in the car and after 1 hour the car would overheat, because the hose would leak , and the water would evaporate. Hence why I was not seeing any leaks.


Thanks.
 

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The main one with the leak was the number 8 house in the diagram. Its interesting because when that one leaks, the water gets evaporated because of the heat in that area and on the parts. Thus the leak can be hard to pinpoint.
It is a hard pipe and not a soft rubber hose. As I said the slow leak (water gets evaporated because of the heat in that area and on the parts. Thus the leak can be hard to pinpoint) that didn't dump the coolant on the floor would not cause the overheat. Hopefully after replaced the #8 pipe the mechanic bled the system properly and this fixed the overheat, but not the old pipe with small leak that caused the overheat. (Remember you had thought the problem was fixed, twice, and it came back.)
 

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Proper bleeding is critical. You should be watching the temperature guage closely after you pick up the car. I mean closely.
 
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