Losing coolant

Hi all,
My 2018 is loosing coolant, took it to the Dealership, did a pressure test and everything came ok, so I 'm leaning towards the radiator cap since there's a trail of dried coolant and also on the engine cover theres coolant residue , has anyone else had this problem, Truck has 25k. Thanks

 

Cap could just have been loose. Clean and go for a long drive and check again.

 

Will do , thanks

 

Cold and hot can make a difference during a check, cold might not show an issue that's only there when hot.

Check on top of the engine, under the cover and noise insulation. There is a coolant cap there that has been known to leak.

 

Roger, there is some coolant on top of the engine cover that is way I m leaning towards a bad cap, but will check this as well thanks

 

There should never be any coolant on top of the engine cover!
If not the cap, check the hoses. Pull over when the engine is hot and check. Cover your hand and head and wear safety glasses just in case. You may hear hissing before popping the hood.

 

I agree, have an appointment next monday for that and left camshaft tower is starting to leak, thanks

 

I don't want to scare you but it could also be a head gasket leak. You can tell by bringing the truck up to temp and checking to see if any bubbles are present in the reservoir. What happens is that when head gaskets leak into the cooling system it creates over-pressure in the radiator and pushes the coolant out through the cap. I had this problem on my Taco and at first thought it was the cap but unfortunately it turned out to be a blown head gasket.

 

It's a posibility although , they did the pressure test on the system, it should of lost pressure of a bad gasket ? Will keep an eye , I am thinking that the previuos tech before the last check left that cap loose cause cant find anything and coolant has stabilized in bottle

 

Metal/materials expand at different rates, that's why a cold leak test may not show an issue that is present at temp - hence my previous comment above in post 4.