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Hello, my name is***** leaked into interior of vehicle? Thanks.
If you have coolant inside the vehicle this would mean your heater core is leaking. The heater core is like a small radiator behind dash which air blows through to provide you heat. It is about a 7 hour job to replace and a $300 part so your looking at around $1000 total for repair. The coolant is not deadly but if engine runs out of coolant it can overheat causing major engine damage. Let me know if you have more questions or if there is anything else I can do to help. Thanks.