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Re: Check engine light
Welcome to AF!!
1.5 inches seems to be about right especially below the cold fill line. As for the coolant flush if you are close to the 5 year mark on the coolant a good flush won't hurt anything. Although I would recommend that you have it done by a professional. Because of the toxic nature of the coolant a good coolant recovery system is essential to preventing environmental contamination. I would also recommend that they replace the coolant with Prestone long life antifreeze and forget the dex cool. The prestone is much better and won't cause the issues that he Dex will cause.
As for the gunk you will usually see it in the reservoir or at the bottom of the cap. It usually only forms where there is come contact with air.
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