Hard to tell
Are you losing coolant?
small leak in the hose?
I just replaced my WP and I saw dried coolant above the WP. It appeared to have a shaft seal leak and I am guessing it was "blown" up there.
Pressure test your system and see if you have any leaks
Hopefully it's not from a leaking head
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2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
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