No need to do that, behind the glove box is the blend door motor, it most often breaks the shaft of the blend door, which causes a costly fix, and it will break it again. There are sites that tell you how to remove the motor, drill a small hole and put a pin in the shaft so that the motor will still turn the broken connector, I did this and my blend door is still working 5 years later. I have heard stories of people paying up to $700.00 to have the original blend door replaced, and it breaks again.
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Your first step is to make sure coolant is getting to the rear heater core. Pipes to core should be felt or measured with a thermometer to ensure hot coolant is even getting back there. Inlet and outlet pipes should be very hot and very close to same temperature. If they are then coolant flow is good and you have a problem with air temperature blend door not routing the airflow thru the hot heater core.
If the engine is not heating up, check the thermostat and coolant level. If the heater is not getting hot, and both heater hoses are hot, you may have a blend door problem. The blend doors direct air thru the heater core and the vents.
That noise is the heater and AC air temperature control electric blend door motor trying to move a duct door that is sticking due to heat warping. You will need to remove the entire dash assembly and replace the blend door. This door is located between the AC core and the heater core and "blends" the air from each (hot from heater core and cold from AC core) to give the desired air temperature,.
Check heater core for 2 hot pipes. If they're hot, then the problem is in the blend door. If the 2 pipes are cool, then the heater core is plugged up and needs to be replaced rather than flushed, since flushing didn't help in the past.
if the heater hoses are both hot its a blend door actuator, and possably the blend door its self, the way to make sure is to feel around under the dash . feel the black hvac box and if its feels warm then the heater core is good, you will have to remove the dash to replaced the bland door actuator and blend door ,i reccomend you replace both beacause its alot of work to remove the dash so make sure both components are replaced while you are in there
try back flushing heater core, i know both hoses are hot but if blend door works then its got to be the core particaly blocked, also are you sure your looking at the blend door.try removing hoses from core then back flush with waterhose, go both ways, hope this helps good luck.
It is most probably the problem with blend door or blend door actuator. But just in case I would suggest to follow the entire procedure:
First you have to identify what causes the problem.
To do this you have to: 1)When engine is cold check the level of coolant. If it is low fill it up. 2)Start engine and check if engine reaches regular temperature. If your engine is not heated enough it means your thermostat does not work properly and should be replaced 3)If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is warm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core. 4)If pipe/pipes are hot/warm, turn off the fan, switch controller to the hot position, wait for 3-4 minutes and turn on the fan. Note if the cold air blows first or warm air blows first but it cools down in 5-10 seconds. If the air blows cold than it is most probably the problem with blend door or blend door actuator. 5)If air blows warm first and then cools down, then while running engine and remaining the transmission in PARKING position, press on the gas pedal until your engine reaches 3,000 RPM. Check if your heater blows warm/hot air. If it does, then your water pump does not work properly and should be replaced. If the air still cold, I would suggest flushing the heater core.
If you have good heat on one side, it can't possibly be the the thermostat. Good heat on one side means that there is plenty of hot water (water and antifreeze mix) circulating through your heater core. The thermostat controls the temperature of the water. If you have hot water, the thermostat is not at fault. Your Impala is equipped with what is called "zoned climate control". All the inside air (both sides) is still heated by the same heater core. The difference between a "zoned" system and a conventional system is that there is more than one "blend-air" door insided your HVAC housing. The blend-air door swings back and forth to direct the incoming air either through the heater core (for hot air) or around the heater core (for cold air) The drivers blend-air door may be broken or the motor that moves the blend-air door is malfunctioning.
OK the problem is the air duct blend door is either stuck or the more likely the motor that operates it is defective, in order to replace/repair this door or it's actuator the dash assembly must be removed, there is no other way to get access to the defective part. The blend door is what diverts air between the heater core and the AC evaporator core, for either cold, hot, or a mix or blend, hence the name blend door.