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Q:

the engine is getting to temp but cold air is coming through heater. on 2003 GMC Sonoma

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
when the engine is started when warm we get a little heat but that stops after a couple of minutes.
(1) Answer
possible blend door