Q: my heater is not working properly on 2001 Mitsubishi Diamante

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when i turn my temperature up it doesnt heat.
(3) Answers
It is possible your engine is not running warm enough. Check the heater hoses under the hood to see if they are very hot, or if they are only luke warm. If they are just warm, it could need a thermostat.
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Check your colant as well. There is also a coolant temp sensor uder the dash that needs ot checked. Don't think you have a heater control valve that may have failed.
if you're running low on coolant the temp gauge will read low even when hot as the temp gauges the coolant temp NOT the engine temp... if the heater core or hoses to it are clogged (rare) it won't allow the HOT coolant to get to the heater core... and of course we're all assuming the heater fan is operational ? and that you have the proper thermostat installed?
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