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Vehicle has 202k miles
No milk shake under oil cap or on dipstick. Oil color good. Nothing noted during last oil change.
No white smoke. No overheating. Does not run rough.
Dye shows no external leak. No visible leak.
Engine block test shows no hydrocarbons in cooling system (liquid stays blue)
However, lately every 2-3 days coolant level is low (about 1/2 inch) below “cold fill” line, when checked cold. Top it off, level stays fine for 2-3 days then low again.
Where else can the coolant be going? What should I check next?