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Is it cold or just not blowing the correct amount of air? If it's cold it may be the heater door in the dash not opening, bad thermostat(could be defective), Water shut off valve (if so equipped), A/C problem(on?), cooling fan staying on, dash heater control problem, plugged heater core(inner tubes). If not enough air flow then the blower motor may be bad, blower resistor, plugged heater core(outer fins), blocked vents, plugged cabin air filter. These are places to start...

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17y ago

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