Coolant leak... where?

[bassrebel]

So after I finished all the trouble of diagnosing and fixing the engine stuttering I have now come to a new problem... coolant leak lol...

The coolant is dripping by the passenger side... I tried looking for the usual signs, bleeding screw, radiator cap... replaced both and it's still leaking... The car is not overheating, the fan is not always on, so I don't think it's the water pump... what can it be??

Any usual N55 leaks? Any help will be appreciated

[bassrebel]

Just to add... whenever I fill up the tank and run the bleeding procedure I don't see any leaks... however, once the car has come to temperature that's where I see the leak.

[bassrebel]

Attached pictures of where I see the leak

[projectbarnie]

I had a leak at my expansion tank. Replaced that and the leak went away.

[bassrebel]

Originally Posted by projectbarnie

I had a leak at my expansion tank. Replaced that and the leak went away.

Do you know the reservoir capacity???

[projectbarnie]

Originally Posted by bassrebel

Do you know the reservoir capacity???

Sorry no idea... shop did the fix for me.

[bassrebel]

Originally Posted by projectbarnie

Sorry no idea... shop did the fix for me.

I went ahead and ordered one either way... if the leak is not persistent all the time then I can remove the possibility of a hose... if the leak starts once the car comes to temperature then there's a chance that the reservoir has a leak somewhere... crossing fingers!

[chance91]

Originally Posted by bassrebel

I went ahead and ordered one either way... if the leak is not persistent all the time then I can remove the possibility of a hose... if the leak starts once the car comes to temperature then there's a chance that the reservoir has a leak somewhere... crossing fingers!

Hopefully it is the tank. Of note, if the cap releases pressure, it leaks out the bottom of the tank. If you look around the cap there is a hole that goes through the middle of the expansion tank to leak out. So maybe its a bad seal on the cap and leaking out bottom of expansion tank.

Very hard to say from photos, as a lot of coolant lines over there. as well as the waterpump.

[bassrebel]

Originally Posted by chance91

Hopefully it is the tank. Of note, if the cap releases pressure, it leaks out the bottom of the tank. If you look around the cap there is a hole that goes through the middle of the expansion tank to leak out. So maybe its a bad seal on the cap and leaking out bottom of expansion tank.

Very hard to say from photos, as a lot of coolant lines over there. as well as the waterpump.

Hm, I do know that the cap was all sorts of messed up... I'll try with the new cap first, if it works I'll return the tank then 😜

[bassrebel]

Originally Posted by bassrebel

Hm, I do know that the cap was all sorts of messed up... I'll try with the new cap first, if it works I'll return the tank then 😜

New development!!!

https://drive.google.com/file/d/1xeF...w?usp=drivesdk

Here's a video I took of the leak... it looks like one of these two hose is the culprit!

Halp!

[chance91]

Originally Posted by bassrebel

New development!!!

https://drive.google.com/file/d/1xeF...w?usp=drivesdk

Here's a video I took of the leak... it looks like one of these two hose is the culprit!

Halp!

Still pretty hard to tell. I Think you may want to bring it in to a shop on a lift with the undertray off.

Hate to say, but that looks like the hose going to the Waterpump. Concerned the waterpump gasket may be cracked or gasket leaking = $$$

Hopefully you can just tighten the hose clamps?

https://www.realoem.com/bmw/enUS/par...-X1_35iX&mg=11

https://www.realoem.com/bmw/enUS/sho...diagId=11_4468

[bassrebel]

Originally Posted by chance91

Still pretty hard to tell. I Think you may want to bring it in to a shop on a lift with the undertray off.

Hate to say, but that looks like the hose going to the Waterpump. Concerned the waterpump gasket may be cracked or gasket leaking = $$$

Hopefully you can just tighten the hose clamps?

https://www.realoem.com/bmw/enUS/par...-X1_35iX&mg=11

https://www.realoem.com/bmw/enUS/sho...diagId=11_4468

Based on the angle it looks like the leak is towards the radiator... My shop will take a look at it later this week and replace what's needed.

[bassrebel]

I finally had some time to check this out and it turned out to be the water pump that was leaking... I went ahead and replaced the thermostat as well