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Why does car run hot when heat or air is on for 20 minutes on 2007 Mazda Mazda3

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Thermostat was replaced when car overheated after check engine light kept coming on. Car now goes to hot after about 20 minutes with heat or air conditioner on. Drops fairly slowly to normal when turned heat/air turned off.
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