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-   -   Water Pump Coolant Sensor leaking (https://xoutpost.com/bmw-sav-forums/x5-e70-forum/109930-water-pump-coolant-sensor-leaking.html)

Baby Unicorn Taco 03-15-2019 06:35 PM

Water Pump Coolant Sensor leaking
 
Quote:

Originally Posted by Bmwfvr (Post 1157533)
yes you are right. is the coolant leak from the weep hole visible without taking parts out of the way? should i be able to see a trace of coolant by simply looking at the front of the engine?



Yes. Nothing has to be removed to see the weep hole. It is a hole about the size of a pencil. It is on the front of the engine block. It is kind of behind and to the left of the water pump. It does not always look like coolant drops. It can look just wet.


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Bmwfvr 03-15-2019 06:41 PM

Quote:

Originally Posted by Unicorn (Post 1157535)
Yes. Nothing has to be removed to see the weep hole. It is a hole about the size of a pencil. It is on the front of the engine block. It is kind of behind and to the left of the water pump. It does not always look like coolant drops. It can look just wet.


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The traces of coolant definitely start at the bottom of the sensor and run down the water pump .. I will take a close up picture, hopefully I get a better view of the weep hole.

Bmwfvr 03-15-2019 06:46 PM

by the way, does coolant need to be drained to remove and re-install the sensor? I did it a couple of times without draining and it was fine, no coolant came out but the last time I did it lots of coolant gushed out and spilled everywhere!!

Baby Unicorn Taco 03-15-2019 06:46 PM

I used a URO expandable pipe. No issues at all and passed the pressure test. They have great customer service as well. AGA is a different design and is good as well. It is a job to be careful with and follow directions. It's not rocket science.


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rbryantaz 03-15-2019 07:01 PM

Quote:

Originally Posted by Unicorn (Post 1157538)
I used a URO expandable pipe. No issues at all and passed the pressure test. They have great customer service as well. AGA is a different design and is good as well. It is a job to be careful with and follow directions. It's not rocket science.


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Just make sure they do a really good job of getting the front gasket surface clean. It is hard to see and it can have a lot of corrosion, gasket material, etc left over in it that can cause it to fail in the future.

-Rich

Baby Unicorn Taco 03-15-2019 07:05 PM

Quote:

Originally Posted by rbryantaz (Post 1157539)
Just make sure they do a really good job of getting the front gasket surface clean. It is hard to see and it can have a lot of corrosion, gasket material, etc left over in it that can cause it to fail in the future.



-Rich



For sure. I used a gasket hook tool, wire brush, tooth brush, brake cleaner then distilled water. Hard to get 100%. Mirror is a must for the job.


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Bmwfvr 03-15-2019 07:27 PM

1 Attachment(s)
Quote:

Originally Posted by Unicorn (Post 1157535)
Yes. Nothing has to be removed to see the weep hole. It is a hole about the size of a pencil. It is on the front of the engine block. It is kind of behind and to the left of the water pump. It does not always look like coolant drops. It can look just wet.


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Here is a shot of the sensor. I dont see any leaks from around or near the coolant pump!!Attachment 75703

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Baby Unicorn Taco 03-15-2019 07:30 PM

Quote:

Originally Posted by Bmwfvr (Post 1157541)
Here is a shot of the sensor. I dont see any leaks from around or near the coolant pump!!Attachment 75703

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That leak is from the sensor. With an o-ring instead of sealant it will stop it from leaking very easily. It's a small o-ring. Has to be buna-n or viton for the heat.


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Bmwfvr 03-15-2019 07:31 PM

Quote:

Originally Posted by Unicorn (Post 1157542)
That leak is from the sensor. With an o-ring instead of sealant it will stop it from leaking very easily. It's a small o-ring. Has to be buna-n or viton for the heat.


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So replace the metal washer with an o ring?

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Baby Unicorn Taco 03-15-2019 07:53 PM

Quote:

Originally Posted by Bmwfvr (Post 1157543)
So replace the metal washer with an o ring?

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https://uploads.tapatalk-cdn.com/201...abcec911db.jpg o-ring here



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