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Q: heater noise on 2003 Mercury Mountaineer

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
no noise on cold. turn to heat and turn it up and the noise begins. this is my daughter's car in North Carolina.
(1) Answer
You'll need to have someone look at this, or try to locate the source of the noise, without hearing it we simply cannot give much useful advice.
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