Brown substance in coolant tank

[KRauto]

I have a 2023 Ford Maverick Hybrid Lariat.
□ aprox 4100 miles

See this brown substance in the coolant tank.

~ 2 months ago, during a recall pointed this out and ultimately had coolant tank a fluids replaced.

I still see this substance but it seems like a slightly thicker line now.

Anyone else experiencing this?

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[CurtisB]

This may be one of those things where we need some type of photo if you can do it.

 

[KRauto]

Attached pics. Cell phone had trouble uploading on the initial post. Here they are.

 

[Decayed]

Oil getting into the coolant? Leaky head gasket?

 

[KRauto]

This may be one of those things where we need some type of photo if you can do it.

Yup. Cell phone had issues uploading pics on post.

 

[23grayXLT84]

Can't believe they replaced it and crossed their fingers hoping for the best.

Whatever it is, is not good and dealer probably dreads repair as it's under warranty and won't pay good.

 

[KRauto]

Yes, they initially thought was head gasket issue but ultimately just changed coolant tank because they just saw oil and not the "milky" substance.

 

[CurtisB]

That my friend, is not normal and is not good. Take it somewhere else to get it fully investigated.

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