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Old 02-14-2019, 12:42 PM
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Coolant Leak, canít find the source?

07í X5 4.8, just replaced the water pump as it was making a little bit of noise, and what I thought was coolant coming from the weep hole. After I got everything back together I noticed that I was still leaking coolant. Itís not catastrophic yet, used the coolant pressure tester to try and find the leak this AM, but I canít physically see the source of the leak. It seems to be coming down from the front of the motor, but the water pump area is dry above and below. I would say the leak I had previously was whatever is leaking now, and not my old water pump.

Anyone have any ideas whatís in that area that could be leaking?


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Old 02-14-2019, 03:55 PM
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Is there evidence of coolant on the front? Or you're finding coolant under the car and assuming it's from the front of the engine?



There's a number of hoses in that area, so it could be any of those. Also a sensor in a hose. I had a leak from a hose that was getting on the belt so it was squealing during cold starts, but there was very little noticeable evidence on the engine itself. Also could be your valley pan, which I believe will start to weep out through the timing cover somehow (I haven't had this yet so haven't looked into how to track it down).


Personally when I'm trying to track down a coolant leak I'll go through a physically touch every hose connection point, particularly the bottom, to feel for any wetness and/or crustiness.
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Old 02-14-2019, 06:23 PM
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Had Similar issue found thermostat gasket leaking. 2008 x5 4.8 . The thermostat has built in gasket
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Old 02-14-2019, 07:29 PM
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Behind the water pump, on top of the engine block there are small hoses connected to the main hose of the WP. you can check those to see if one of them is leaking.
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Old 02-14-2019, 08:15 PM
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Quote:
Originally Posted by Nanniepoo View Post
Is there evidence of coolant on the front? Or you're finding coolant under the car and assuming it's from the front of the engine?

It is definitely dripping from the front of the engine / engine bay somewhere. Iím not quite sure were the weep holes are for the valley pan area.


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Old 02-14-2019, 08:26 PM
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Quote:
Originally Posted by Hack213 View Post
Had Similar issue found thermostat gasket leaking. 2008 x5 4.8 . The thermostat has built in gasket
If he replaced the WP I'm hoping he replaced the t-stat as well. Or at least the gasket
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Old 02-14-2019, 11:13 PM
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Coolant Leak, canít find the source?

Quote:
Originally Posted by Nanniepoo View Post
If he replaced the WP I'm hoping he replaced the t-stat as well. Or at least the gasket


Yes, water pump and thermostat were replaced with new. I guess I will check each hose connection, but itís got to be close to the engine if itís dripping there.




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Old 02-15-2019, 02:01 AM
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Ok, after I spent some time trying to find the leak, I noticed that the water pump was leaking around the seal to the engine. After I started pulling things apart to check the torque on the bolts I noticed that it was the water pump temp sensor leaking. Just enough where you couldnít notice the coolant on the shiny new cast pump, and it was trickling down the front side of the motor. So I will start here first, and look for more leaks.

I did not install a new water pump temp sensor, just transferred over from the old pump. Should it have a crush washer type seal? There was no washer in the old pump, I just cleaned the surface and put it on. Looking at the OEM diagram it doesnít show a washer, out looking up the part at the parts sites I noticed a washer on one. Can someone shed some light on this for me? Need to seal it up properly and move on to the next leak, that is if this isnít my lucky fix.

Here are some pics of what Iím looking at:










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Old 02-15-2019, 10:36 AM
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Found the perfect size crush washer for the job, 7/16Ē.




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Old 02-15-2019, 12:52 PM
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Nice. Hope it works out
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