How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask John Your Own Question
John, Master A.S.E Automotive technician
Category: Chevy
Satisfied Customers: 9176
Experience:  A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician
Type Your Chevy Question Here...
John is online now
A new question is answered every 9 seconds

2006 Chevy Malibu LT: V6..vents..temperature faults

Customer Question

I have a 2006 Chevy Malibu LT-V6. The vents blow cold air regardless of
the setting of the temperature control. There are no faults on the computer. Engine coolant level, thermostat and operating temperature are
ok. There is heat in the pipes going from the engine to the heater core.
Defroster and AC operate normally.

Do I have to replace the control switch?
Submitted: 7 years ago.
Category: Chevy
Expert:  John replied 7 years ago.


Make sure when you are viewing failure codes for this system you are viewing BCM(body control module) & not PCM(powertrain control module).Most of the time when this problem occurs it is the temperature control actuator,which you can view input & output controls from BCM data list.Here is some help replacing it.


Temperature Valve Actuator Replacement

  1. Remove the fuse labeled HVAC CTRL (BATT).
  2. Remove the left closeout panel. Remove the knee bolster. Object Number:(NNN) NNN-NNNN Size: SH

  3. Remove the air temperature actuator screws.
    Object Number:(NNN) NNN-NNNN Size: SH

  4. Remove the air temperature actuator.
  5. Remove the air temperature actuator wire harness connector.


Object Number:(NNN) NNN-NNNN Size: SH

  1. Install the air temperature actuator. Tighten the air temperature actuator screws.
  2. Tighten
    Tighten the screws to 1.5 N·m (13 lb in).

  3. Install the knee bolster. Install the left closeout panel. Install the fuse labeled HVAC CTRL (BATT).
John and other Chevy Specialists are ready to help you
Customer: replied 7 years ago.
Are the BCM and PCM read from the same under-dash connection?
Expert:  John replied 7 years ago.
Yes,the ALDL is the place ALL your vehicle computers will communicate,but your scan tool must have the correct software & ability to complete the communications.