We have a 99 Pontiac Grand Am with 99K miles and it has been using coolant for about a month now.
Adding coolant only seems to have prolonged the inevitable. Now it used 1/2 gallon for the last 30 miles and the service engine light has come on. The car also is running poorly. It is missing badly. I want to take it to AutoZone to get a diagnostics. Is it safe to drive? Any idea why it is now missing? The oil is clean and exhaust appears OK.