Coolant leak

[RacerPaul]

Hello Mustang friends!
First I want to thank everyone for sharing their expertise on every issue that comes up. So incredibly helpful; I'm very impressed with the wealth of knowledge and ability amongst all the owners and DIY owners. Solving these problems on our own not only saves a lot of money, but also helps us know our cars better and become more educated, always a good thing.
The latest concern with my 2017 GT (convertible, 41k miles) i
noticed a small puddle of antifreeze ( about 3/4 cup appx)on the garage floor one night after having been parked about a week.
So of course, dived right into it.
Removed under body front cover, inspected hoses, radiator, plastic connections, looked closely at everything I could see and reach; found nothing.
Ran the car to normal operating temperature, gauge stayed in middle range, found nothing
Shut engine off, looked at everything under pressure and warm, again found nothing
Since then, drove the car for a Wednesday night event, and parked in the garage later.
Next day, no sign of any leaks, everything dry, hmmm, I say while scratching head
I believe this is a closed system, so I'm stymied as to how the antifreeze escaped
I think the next step will be a pressure test of the system
Any thoughts or opinions on this would be very much appreciated!

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[NGOT8R]

Pay close attention to this area, that may be where your problem lies.

 

[ORRadtech]

From an EB owner so take this for what it's worth.
Yes, pressure test.
The V8 is known to leak from the front of the pump through a "weap" hole. I understand it's pretty difficult to get a visual of.
What was the condition(s) when it was parked? Car been pushed hard? Weather very hot? It could have been a one time expulsion from the expansion tank.

 

[NGOT8R]

Upgraded part.

https://shop.advanceautoparts.com/p...Kj3LjljwMV_IbCCB21eQOAEAQYASABEgIsefD_BwE#top

 

[robvas]

Upgraded part.

https://shop.advanceautoparts.com/p...Kj3LjljwMV_IbCCB21eQOAEAQYASABEgIsefD_BwE#top

I have a hard time thinking of anything from Dorman being an 'upgrade'

I would replace the o-rings

 

[NGOT8R]

May be hit or miss, but they advertise it as aluminum, whereas the factory one is plastic.​

 

[ORRadtech]

I have a hard time thinking of anything from Dorman being an 'upgrade'

I would replace the o-rings

Some of their stuff is a definite upgrade over stock. For example, the Dorman oil filter housing for Chrysler V6 engines is aluminum, vs OEM plastic, and is a real improvement.
I'm not sure what that says about the state of the industry when a Dorman part is an improvement over OEM.

 

[RacerPaul]

Hello Mustang friends!
First I want to thank everyone for sharing their expertise on every issue that comes up. So incredibly helpful; I'm very impressed with the wealth of knowledge and ability amongst all the owners and DIY owners. Solving these problems on our own not only saves a lot of money, but also helps us know our cars better and become more educated, always a good thing.
The latest concern with my 2017 GT (convertible, 41k miles) i
noticed a small puddle of antifreeze ( about 3/4 cup appx)on the garage floor one night after having been parked about a week.
So of course, dived right into it.
Removed under body front cover, inspected hoses, radiator, plastic connections, looked closely at everything I could see and reach; found nothing.
Ran the car to normal operating temperature, gauge stayed in middle range, found nothing
Shut engine off, looked at everything under pressure and warm, again found nothing
Since then, drove the car for a Wednesday night event, and parked in the garage later.
Next day, no sign of any leaks, everything dry, hmmm, I say while scratching head
I believe this is a closed system, so I'm stymied as to how the antifreeze escaped
I think the next step will be a pressure test of the system
Any thoughts or opinions on this would be very much appreciated!

Pay close attention to this area, that may be where your problem lies.

Thank you Adrian, will do

 

[RacerPaul]

From an EB owner so take this for what it's worth.
Yes, pressure test.
The V8 is known to leak from the front of the pump through a "weap" hole. I understand it's pretty difficult to get a visual of.
What was the condition(s) when it was parked? Car been pushed hard? Weather very hot? It could have been a one time expulsion from the expansion tank.

Thanks for quick response Dave
Car wasn't pushed hard, maybe just a wee bit, but was plenty warm, temp gauge was in middle
I have not been able to locate the expansion tank expulsion port but that's a good possibility
From what I could see of the water pump looked clean
Thanks for the tips

 

[RacerPaul]

Upgraded part.

https://shop.advanceautoparts.com/p...Kj3LjljwMV_IbCCB21eQOAEAQYASABEgIsefD_BwE#top

Thanks again Adrian, I'm going to take a closer look at that ASAP

 

[RacerPaul]

From an EB owner so take this for what it's worth.
Yes, pressure test.
The V8 is known to leak from the front of the pump through a "weap" hole. I understand it's pretty difficult to get a visual of.
What was the condition(s) when it was parked? Car been pushed hard? Weather very hot? It could have been a one time expulsion from the expansion tank.

Oops, forgot to mention, late at night, cool outside air
Shoulda had the top down!

 

[NGOT8R]

Thanks again Adrian, I'm going to take a closer look at that ASAP

Let us know what you find out. I do know for certain that area is prone to leaking. My buddy has a 2019 Bullitt and his leaked there.

 

[Diegosuave]

I recently had a similar experience. I took it to my mechanic to get it pressure-tested and found multiple leaks coming from the water pump and the thermostat housing T-connector. They replaced the water pump with an OEM part and opted for the aftermarket aluminum thermostat housing T-connector mentioned above. Since making these replacements, I haven’t encountered any issues.

 

[robvas]

Some of their stuff is a definite upgrade over stock. For example, the Dorman oil filter housing for Chrysler V6 engines is aluminum, vs OEM plastic, and is a real improvement.
I'm not sure what that says about the state of the industry when a Dorman part is an improvement over OEM.

Maybe. Their Pentastar aluminum thermostat housing is known junk. Their 2V intake manifold is junk.

 

[RacerPaul]

I recently had a similar experience. I took it to my mechanic to get it pressure-tested and found multiple leaks coming from the water pump and the thermostat housing T-connector. They replaced the water pump with an OEM part and opted for the aftermarket aluminum thermostat housing T-connector mentioned above. Since making these replacements, I haven’t encountered any issues.

Hi Diegosuave Thanks for your quick response!
Yay!!!
My shop of choice, the fantastic Joe's Garage here in Eugene is going to pressure test the system for me next Tuesday, along with replacing the ac condenser, whose fins have shredded themselves and are falling off! Got a new condenser coming from American Muscle
Going to look closely at your recommendations, thank you very much!

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