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Heater not warming sin last winter! - 2003 Toyota Matrix

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You could be low on Coolant, or you might need a new thermostat, if yours is stuck shut then it won't allow any coolant to flow which means no warm air. Lastly, if your heater controll valve isn't opening then no hot coolant is able to pass through your heater core and you won't get any heat. This valve can be cable operated or electrically operated.

Posted on Oct 08, 2009

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