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Because the blend doors are stuck in the wrong way == If the fan is still blowing air,check your thermostat.If that doesnt fix it check the control valve under your hood(if your model has one). last,but not least, check your heater core. if both in and out hoses are hot when car is warmed up, its supposed to mean it's ok.( if not, you'll need it replaced) Good luck!

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19y ago

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