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Q: Why truck heat will not warm up? on 2000 Mazda B3000

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Had a small hole in small hose running from thermostat housing to tee in lower radiator hose.Since replacing this hose the heater temp in cab is slightly warm and the temp gauge in dash reads cold.does not appear to be an air lock and have replaced the temp sender.Also what is this small hose for?
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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Agree with miles. A thermostat stuck full open will prevent the coolant from getting into regular operating temp.
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