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#1
02-28-2023, 07:28 PM
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Coolant Leaks
It's hard to tell so far, but I'm going with the water pump because that's a common problem with the M5x engines. This engine has an auxiliary pump that I have not had in any of the earlier engines. How prone is the aux water pump to leaking, and why would any leak take 1.5 hours from when I park to when the leak appears on the ground under the car? The HVAC system does not have any indications that it will cycle coolant -- the job of the aux pump -- so I have no idea how to make it work, and I don't really care. But the aux pump is there and I'm having a leak so I have to wonder what conditions would make it leak after 1.5 hours of turning the car off. 
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#3
02-28-2023, 08:03 PM
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The plate under the engine makes it hard to see, but the drips are front and center, and if they were on the side, it would be the intake side.
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#4
02-28-2023, 08:49 PM
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You probably need to put the car in the air and take off the plate to see clearly where they are coming from.
Just a matter of finding the leaky parts and replacing them, but to be honest, if you have a fair amount of miles on the car it's probably time for a cooling system overhaul. If everything is the same age and one part is leaking, other parts are probably soon to follow.
__________________
2003 3.0 5MT Topasblau Purchased in 2016 and surprisingly still running
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#5
02-28-2023, 10:45 PM
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Quote:
Check the transmission coolant block o-rings, also the tanks get old/brittle and can have a small crack at the header plate near the bottom hose. Sent from my SM-A528B using Tapatalk
__________________
"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course
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#6
03-01-2023, 03:49 PM
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I can find the leak and fix it, that's easy. I want to get the parts on hand before I take the car apart.
The question is about, what leaks an hour and a half after turning the car off? All of the "normal" stuff that leaks will leak all of the time. My car does not leak for a long time after parking it, then it only seems to leak for an hour or so. Because there is an auxiliary water pump that I am not familiar with, my specific question is whether it does something after the car is parked that ends up on my driveway.
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#7
03-01-2023, 05:31 PM
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Quote:
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#8
03-01-2023, 05:33 PM
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It could be anywhere. I do understand how you want to be prepared, but just find the leak and then order the parts to fix it.
The last leak I had was coming out of the heater control valves. I found it using UV dye.
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#9
03-01-2023, 09:25 PM
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"where are my coolant leaks coming from...." Really??? How about all 46 (sic)places that a coolant joint/attachment point is!!!!! And the 1.5 hour part is that as things heat up, they expand, when they cool, they contract. 4th grade science class. There are so many Orings, gaskets, etc etc on this engine that you have to do some work to find it.
__________________
Dave S. Northeast 2003 4.6is 2005 E53 4.4 2003 E39 Msport(a REAL ONE!) 1959 Fiat 600
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#10
03-02-2023, 12:13 PM
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Quote:
The aux water pump only comes on when the key is in the ignition
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