Hello,
What your mechanic is referring to is your vehicle's heater core. The heater core is like a small radiator that sits at the opposite end of the cooling system circuit from the radiator, in your vehicle's dashboard. It is responsible for not only the heater, but the defroster functioning as well. When the heater core leaks, like a radiator, it will leak all over the carpet inside your vehicle and cause carpet damage, it may cause your vehicle to overheat and cause catastrophic engine failure. I would recommend getting it replaced at your earliest convenience. Here is a link below for you to go to:
https://www.2carpros.com/articles/replace-heater-core
Thanks,
Alex
2CarPros
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Monday, July 29th, 2019 AT 3:07 PM