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What could this white stuff be?

Cobra Jet

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Common issues with the S550 overflow:

- cracks in bottle nipple where any of the hoses connect

-factory hose "pinch clamps" suck and allow seepage; replace with actual work gear clamps

- check bottom side of bottle for cracks

- check the plastic cap for failure; regardless of miles these caps are know to disintegrate on the underside or when removing from bottle

- check clamps at the main too rad hose too and make sure there isn't any seepage

Rinse and repeat - meaning, rinse everything off, dry (use a blower it is faster method), go for a 20 minute drive so everything is to operating temps, come back and check for any coolant and try to back track to the source, there's always a source...

If it's not at the bottle or hoses at the bottle, then see if you can get a closer look at or remove the factory fans/shroud assembly and see if the rad core is leaking at the end tanks... That would be the only other area (based on your images) where fluid would be leaking - because it's right at the rad core area (again from your images).

It's not water pump because it wouldn't shoot coolant at back if the rad area. If the WP was leaking there would be staining under it and down the front of the engine/oil pan area (let alone coolant on ground).
 

melwff

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Rent a pressure tester from most chain auto parts stores.
 
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M1N

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Thanks again for all the good information! I will check back once we get it figured out.
 
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M1N

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Just got back from the dealer. The white stuff was dried coolant. There is a block plug that is leaking. Apparently on these engines the block plug screws in. They ordered a new one, probably won’t be able to get it in until the middle of January.
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