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LET YOUR CAR WARM UP FIRST!! or you risk the chance of over heating and casuing engine damage. start your car let it warm up for 5 to ten minutes and then try the heat. also when you start you should NEVER have heat on right away. the heat that you feel comes from the engine. and if the engine is cold and you are trying to heat it up it will put stress on the engine and over heat. ALL cars have to wait for their heat. that's why you see peoples car running in the morning with no one in it. so when they do get in it they have heat. heat will not work until the engine is warm.
yeah,. possible egr, but did you look at the IAC - Idle air control valve? -- controls the idle at cold engine temps by diverting the air from the manifold for heat to help warm up engine on cold start. Best regards Ck
If engine temp is warm, then either your heater core is clogged and needs flushed or your warm /cold door motor is not working properly(located under the dash). if you engine si not getting warm you have a bad thermostat.
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iwould check the selector motor,and also replace the thermostant,start with the stant first,the selector motor is what runs the door for hot or cold the motor is a common problem,if the temp gauge is showing a quick warm up temp then its the selector motor, if it takes a while to reach operating temp then replace the t-stant,also make sure the coolant is full in radiator,check when cold or warm,dont open when hot, hope this is helpful.
remove the radiator cap and let the car run for 30 minutes to let the air out of the heater coil, these radiator caps on the 2008 Impala will not bleed off, while running notice if air bubbles air slowly rising to the top of the radiator cap, re-install cap and see if this fixes problem, we also purchased a new radiator cap, this fixed my wifes car.
Well the heat from a car comes from the coolant which warms up from the engine being on, so if your engine is off, the coolant wont warm up and flow through the heater core, and you wont get warm air. 95% of cars are like this.
Most likely cause is a broken dual zone blend/temp door in the heater box. There is a revised part available from a dealer. It is a big job to replace requiring the dash to come out and heater box. Sometimes, but rarely, it is one of the electric actuators or control head that's the culprit.