Engine fluid ID help

[GMTK]

2018 F150 with 5.0. Walked out to the garage and there was a small puddle of pinkish fluid under the front of the truck. Noticed my coolant reservoir is low so I ASSUME it's coolant. Thought it might be transmission fluid as well but expected it would be much more red. Truck has 80k miles. Didn't snap a pic but if it's there tomorrow I will.

[j4577]

Check water pump, they are pretty common for leaking.

[RapturEd]

Could be Blinker Fluid, check it too!

... Sounds like coolant ...

[Matt]

Idle the truck and see whats squiring out. If you see a puddle it should be pretty obvious what it is by touch and feel. Have a 5.0 too leaking all sorts of things.

[GMTK]

Ran it in the garage and nothing is visibly leaking. Guessing it leaks only under high pressure.

[RapturEd]

Possibly pin hole leak in a hose or radiator, etc ...

[Hooked]

If it's the radiator you might be able to see where it has run down the cooling fins. If the water pump is going out it'll be a slow drip behind the fan.

[WhiteBassFisher]

It almost surely is coolant. Don't fry your engine.

[Stammster]

Taste it.

[Bebo's Dad]

Take it to the shop and have them pressure test the cooling system.
Its either going to leak or its something else.

[Matt]

Oil cooler etc. run around the block and trace it out. Dye kit helps but if you have a puddle it should be easy to track back the residue....

[dwilliams35]

There’s a “y” fitting where the bottom hose goes into the engine and ties into a heater hose: factory one is plastic, has some o-rings inside it that can fail. pretty easy to change those o-rings., there’s just two clips that hold it on and it just slides together … BUT.. that fitting will also crack, very often. there’s some metal aftermarket replacements for it.

[DIHLON]

There’s a “y” fitting where the bottom hose goes into the engine and ties into a heater hose: factory one is plastic, has some o-rings inside it that can fail. pretty easy to change those o-rings., there’s just two clips that hold it on and it just slides together … BUT.. that fitting will also crack, very often. there’s some metal aftermarket replacements for it.

I had this issue on my 2014 f150 5.0. The o-rings flatten and no longer seal. I replaced the entire y-fitting.

[Going_deep]

I had this issue on my 2014 f150 5.0. The o-rings flatten and no longer seal. I replaced the entire y-fitting.

Same here on a 2017. Most auto parts stores will have the Y fitting but not the o-rings to replace. Not that expensive so I'd just get the Y and replace.

[GMTK]

Thanks to all. Truck still has a warranty left and is going in next week for some minor stuff, going to have them test the system and maybe they will just replace the Y connect anyway.