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my heater dont get as hot as it should on 1994 GMC Yukon

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
changed radiator put smaller one on . new heater core and 180 thermastat . still not that hot.and its even cooler on defrost than heat
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