It's likely the heater core. They look like a small radiator and are installed way deep inside the dash area. I'd look it up in a service manual, it's allot of dis-assembly to get to in most cars. A decent home mechanic can do it but I would plan for 2 days with the car out of service. I have seen people bypass them and go with out heat if your on a lean budget it might be an option.
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It's likely the heater core. They look like a small radiator and are installed way deep inside the dash area. I'd look it up in a service manual, it's allot of dis-assembly to get to in most cars. A decent home mechanic can do it but I would plan for 2 days with the car out of service. I have seen people bypass them and go with out heat if your on a lean budget it might be an option.