2015 FORD EXPEDITION ANTIFREEZE LEAK

[DaveBH]

TRUCK LEAKS ANTIFREEZE, BUT CAN'T FIND LEAK. DOING IT AFTER PULLING TRAILER SOMETIMES. ANY HELP WOULD BE APPRECIATED.

 

[99WhiteC5Coupe]

TRUCK LEAKS ANTIFREEZE, BUT CAN'T FIND LEAK. DOING IT AFTER PULLING TRAILER SOMETIMES. ANY HELP WOULD BE APPRECIATED.

I have a 2015 Expedition Limited 4x4. It began to slowly loose coolant at about 70,*** miles.

The dealer initially couldn’t find the leak, then the mechanic figured out that it was leaking at the coolant reservoir nipple, where a hose attaches to it. When the hose was moved or wiggled, it would leak at times.

The coolant reservoir was replaced under the extended Ford warranty and it eliminated the leak. The reservoir has an unusual name in the Ford part’s world.

 

[Don Hall]

Pressurize the cooling system with a simple pump (or more expensive kit).
Pressurization will only be for components external to the engine, unless you
remove the t-stat.

 

[Trainmaster]

Look at the plastic tee in the heater hose above the right side of the engine. They often leak. If that's not it, follow Mr. Hall's advice and do a pressure test. Some auto parts chain stores loan a crummy but usable pressure tester.

 

[11henrs]

In question to Mr Hall if you pump the pressure tester up to around 16psi wouldn’t the bypass let pressure past the thermostat? Just wondering


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[07navi]

In question to Mr Hall if you pump the pressure tester up to around 16psi wouldn’t the bypass let pressure past the thermostat? Just wondering


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Probably not, just take it out and do it right.

 

[Don Hall]

....... if you pump the pressure tester up to around 16psi wouldn’t the bypass let pressure past the thermostat? .....

I'm not savvy enough to provide an answer to your query. All data that I have read regarding a
t-stat by-pass concerns a running engine. I don't know if the by-pass is aware of the difference between a running engine, and a static engine being pressurized.

 

[Boostedbus]

Not sure if this applies to your leak problem or not but my 95 F150 had a coolant leak that I wasn’t aware of until I jacked it up on one front corner. (I jacked it under the passenger side front axle).I was just doing some routine maintenance stuff and noticed the side radiator tank started leaking as soon as I jacked it up and stopped leaking when I let it back down. This seemed odd especially since that truck has a new not rusted out core support in it. I guess there was still enough twist to flex the radiator and make the tank seal start leaking. Even odder it would totally stop when I’d let the jack back down. My point being it was an intermittent leak that I wasn’t aware of until I stumbled across it. Don’t rule out the radiator tank seals even if it isn’t leaking just sitting there. Pulling a trailer could be putting more stress/twist on the truck frame and radiator core support. Just a thought.

 

[David Schaefer]

Per reply #4. The T-Connector on my 2012 leaked. Here's how I fixed it.
https://www.expeditionforum.com/thr...antifreeze-in-them-leaking-t-connector.41872/

 

[mjp2]

In question to Mr Hall if you pump the pressure tester up to around 16psi wouldn’t the bypass let pressure past the thermostat? Just wondering


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It's a closed loop, so pressurizing the cooling system will affect the entire system through the radiator feed and return hoses. The thermostat controls coolant flow but does not create an isolated section within the cooling system.