Anti Freeze Leak

F150 Pat said:

2019 Limited 45K Limited. To date it's been a great vehicle. We love it. Tomorrow taking long road trip. Yesterday go out in the morning to change the oil and I see anti freeze on the floor. very small puddle. I see anti freeze on the frame between the engine and radiator and a few drops forming on the frame edge. My reservoir is almost empty. A hose looks wet but I cant tell. Cant see anything actively leaking. Moved the hoses around to get something going. Nothing. Take it to the dealer. They pressurize twice. Keep it overnight pressurized. Run it to temp. Put it on a lift. No leaks anywhere. No evidence at all of water pump or any hose connection leaking. Radiator dry. Just brought it home. Still dry as a bone. In 4 years I have never open the cap. The level has always stayed right where it should be.


2 questions. What could have happened? and would you take this on a 2K mile trip?

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F150 Pat said:

2019 Limited 45K Limited. To date it's been a great vehicle. We love it. Tomorrow taking long road trip. Yesterday go out in the morning to change the oil and I see anti freeze on the floor. very small puddle. I see anti freeze on the frame between the engine and radiator and a few drops forming on the frame edge. My reservoir is almost empty. A hose looks wet but I cant tell. Cant see anything actively leaking. Moved the hoses around to get something going. Nothing. Take it to the dealer. They pressurize twice. Keep it overnight pressurized. Run it to temp. Put it on a lift. No leaks anywhere. No evidence at all of water pump or any hose connection leaking. Radiator dry. Just brought it home. Still dry as a bone. In 4 years I have never open the cap. The level has always stayed right where it should be.


2 questions. What could have happened? and would you take this on a 2K mile trip?

Click to expand...

99WhiteC5Coupe said:

I had two separate coolant leaks at different times. Multiple trips to the Ford dealer each time who insisted there was no leak.

First leak was the degas bottle fitting on the bottom of the reservoir.

Second leak was the water pump, which only leaked with the engine running and warmed-up.

I would not take the vehicle on a 2,000 mile trip - especially with my family in it.

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JimmyC said:

I had a very similar problem with my F-150, I’d find anti-freeze under the engine and would need to keep topping it off. Two trips to the local Ford dealer, and a couple to the local auto shop, could find the leak. They both did the same thing; they would pressurize the system and seal up the leaky O-ring.
I finally found it myself by cleaning the engine and drying it throughly, the put paper towels around the various hoses and junctions, drove it around for an hour and easly discovered the location Of the leak. It will always be an O-Ring if they can find it when pressure testing.

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