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*not* cracked engine coolant tank lid, it just looks this way

Dxm

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Just casually decided to see what's under the hood. And the coolant tank has multiple cracks. Any way to prevent this? Or it's just defective from the factory?

Also one of the wire harnesses to the spark plugs had stripped wires, maybe it happened from the vibration, or rodents? I put the rodent repellent on the battery cover. Ughhhh
S650 Mustang *not* cracked engine coolant tank lid, it just looks this way Screenshot 2025-12-16 at 8.34.28 AM
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Doug Watson

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I got rid of the plastic tank and put in a Mishimoto tank with a sight glass to check the level.
 


Cz_Ziemniak

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Looks very good.

If you have to replace it anyway, may as well upgrade
 

Zig

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Dxm

Dxm

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Wow. And apparently and evidently this is from the factory the way it’s made. I just came to Ford and was shown the exact same tank cover in a brand new car. !!!! This is normal. Not a crack. Well dang!!!
 

schuvwj

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I think everyone should check their stock plastic coolant tanks. I have 3,000 miles on mine and it has two cracks on the upper half of the tank.
Ford said it’s two weeks out for a replacement.

S650 Mustang *not* cracked engine coolant tank lid, it just looks this way IMG_2854


S650 Mustang *not* cracked engine coolant tank lid, it just looks this way IMG_2852
 
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Dxm

Dxm

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So I corrected the title of the thread! It's normal. These are manufactured this way, and it SURE looks like it's cracked, but it's perfectly fine! All new cars have the tank that looks exactly the same.
 
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Dxm

Dxm

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I think everyone should check their stock plastic coolant tanks. I have 3,000 miles on mine and it has two cracks on the upper half of the tank.
Ford said it’s two weeks out for a replacement.

IMG_2854.webp


IMG_2852.webp
Mine looks exactly the same, all brand-new Mustangs have them exactly the same. It's a seam from the factory, not a crack.
 
 








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