Question about 2005 Chevrolet Impala

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A/C Heater problems

This car has the driver and passenger tempeturer control for the heater and A/C. The passangers control works in either mode but the drivers only works when the A/C is on, when the heat is on it wil only blow cold air even when set to full hot.

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  • Anonymous Sep 28, 2008

    Yes, I have a problem with with only cold air coming out of the drivers side of the car.

  • ryankrt Nov 21, 2008

    Where is the blend door? Can you reach it from the bottom, or does the dash have to come out?

  • misspattonr Dec 15, 2008

    well my heat wont come out at all it just blows cold air.

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There is a motor that operates a door to change the air temp to the drivers side based on the setting of the temp control, it is called a blend door motor, there is a problem with the motor or the blend door is jammed and can't move.

Posted on Sep 08, 2008

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Driver side blows cold air. Can't get heater to work. Passenger side OK. What's wrong?


Heater or mode door actuator bad , possibly ! You can look on youtube for videos showing how to change . It can be easy or very hard to replace . You could have it checked for DTC's diagnostic trouble codes stored in the heater control head . dealer only !

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Only drivers side heat is blowing cool air, passanger side is working fine. are there two different heating untis for this car since it has two separate controls? could it be a sensor or a flap? flap...


No there is one heating unit that has a flap that is controlled by the passenger side vs. driver side cooler or hotter knob or setting, if it's like my Cadillac. It's called a blend door. There is only one heater core that feeds the two separate sides.

Will have to pull the dash, and inspect the vacuum lines and cables.

If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired.
Heater Housing
  • The heater housing is usually under the dash and must be removed to gain access to the heater core.
  • Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.
f74-01.gif The heater housing is disassembled to get to the heater core.
Heater Core
  • Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
  • Remove the heater coolant hoses.
  • Remove the cable and/or vacuum control lines (if equipped).
  • Remove the heater core securing brackets and/or clamps.
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  • To reinstall the heater core, reverse the removal steps.
When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.

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i've been down here too myself, and discovered that the temp control motor, located in the bottom of the glove box, which you can access by clearing all your stuff in in and opening a small door.
you can adjust it manually, and see if it changes, if yes, the switch can be defective, as well as the motor, the switch is the most likely problem.
but adjust it manually first.

Phil
grandmotors.ca

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Just for the heck of it though, check to make sure the wiring to the module under the seat is connected and not loose.

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