The flashing light means there is a problem with the engine serious enough to damage the catalytic converter. You should get the computer scanned for trouble codes.
If there are no external coolant leaks, the engine is probably burning the coolant thru the cylinders and out the tail pipe. Which could also be causing the flashing light.
As Stephen has technically pointed out the coolant has to be going somewhere. A qualified mechanic will be able to tell you exactly where that is. All else, from a pin leak in the coolant hose to a crack in the engine block is all just speculation until the car is actually seen by a Professional.
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Scan the ECU, why ignore the CEL begging to be scanned.
lost coolant is
1: on the ground,.?
2: passengers toes.?
3: in the engine oil pan. look. for milk-chocolate color oil.
4: in the A/T tranny pan, (if you have A/T) same color as above.
5: blown head gasket , which blows the AF out the exhaust as Steam.
AF= antifreeze coolant mix.
the coolant can only go 5 places.
do radiator leakdown test. and or, the blue/green I have exhaust gases in my radiator. test. both tools sold at NAPA auto. or have any ASE shop do this. there are tests for each of the 5 above causes. incuding simple overheating causes. Best practice is to do it now before you lunch a good motor.
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SOURCE: Check engine light blinking
you need to reseal the sparkplug tubes. this requires removing the valve cover.the flashing check engine light means the converter is overheating due to unburned fuel going to the exhaust.
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