My heater blows hot air for 3 seconds then cold air, why? The blower works good and the AC works perfectly, but not my heater.
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Check the hose connections in the engine to the heater, from the back of the dashboard, they may be loose.
Check the thermostat and does it have enough antifreeze/coolant?
You may to replace the thermostat. Many automotive stores will scan for free. Auto zone will do this as well as advance auto.
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