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Chevrolet Trailblazer A/c Heater Control

Repair Solutions for Chevrolet Trailblazer A/C Heater Control

For a comfortable drive through all four seasons, the Chevrolet Trailblazer A/C heater control is there for you. However, if either, or both, of the heating and cooling functions aren't working, you might seriously suffer in extreme weather conditions during the summer or winter. Which is why before this happens to you, be wary of any signs that your A/C heater control might be faulty. To know what to look out for, learn how to check for any problems with these tips.

Check the blend door actuator

When either function--heating or cooling--is not working, the blend door actuator in the affected side might be bad or stuck. To check, take off the plastic cover under the dashboard, close the affected side's door, and lean in on the floor from the other side. Afterwards, put the truck in "accessory" and then move the climate control for one side--fully COOL first then fully WARM--at a time. Whenever you switch to another function, listen closely for the sound of the electric motor spinning in the actuator to know if the heater and cooler work. If you don't hear a sound, then there might be a problem with the wiring connector.

If you don't want to look under the dash, you can also check the actuator in another way. After letting the engine reach its normal operating temperature, adjust the A/C unit to fully COOL function and check for cool air discharge in all areas. Then, do the same for fully WARM function and check for warm air. Then slightly vary the controls from fully WARM all the way to fully COOL while checking for temperature changes. If you don't feel any temperature change--e.g. the cool air discharge doesn't get warm or the other way around--then check the A/C unit's fuse.

Inspect the A/C Fuse

Another possible cause of a malfunctioning A/C heater control could be a blown fuse. To find the A/C unit's fuse, open the Trailblazer's driver's side door and use a flathead screwdriver to remove the cover from the fuse panel. Look for the fuse labeled "HVAC 1." If you see it blown or broken, then take the faulty component out and replace it with a new one.

Examine the wiring connector

If the fuse is fine, then the culprit could be the wiring connector. To find it, remove the four screws from the dashboard bezel that's covering the radio and A/C unit controls, then take the bezel out. Inside, you'll find the A/C unit. Remove the two screws securing it and pull the unit out slowly. Behind it is the wiring connector. To check if it's malfunctioning, gently tug on the cable--if it comes loose, secure it to the A/C unit. However, if this doesn't work, you may have to replace the unit itself.

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  • How to Keep Your Chevrolet Trailblazer A/C Heater Control Efficient

    Whether you're driving under the blazing sun or in the middle of heavy snowfall, you will always be comfortable inside your vehicle. This is because of the Chevrolet Trailblazer A/C heater control, which automatically adjusts the interior temperature based on your preference and other information that the component has gathered. However, to keep this working properly, you have to schedule a regular maintenance for the entire climate control system. If you don't know where to start with this, here are some tips:

    Inspection schedule

    Check your A/C heater control four to five times during winter and at least one more time before summer to make sure that both functions are working properly when you need them. It's also best to have a professional technician service the component once a year.

    Cleaning and other maintenance tips

    • Regularly change the cabin air filter. While there is a standard filter for every vehicle, you can also opt for an activated carbon air filter. This type is recommended for those who are highly sensitive to odors or are easily allergic.
    • Avoid legionella contamination that is commonly found in the climate control system by using an A/C-cleaning anti-bacterial spray.
    • Inspect the condition and tension of the drive belt going from the A/C compressor to the motor. If the belt is too tight, it could ruin the bearings of the compressor; if it is too loose, the A/C heater control will give out a weaker heating/cooling performance.
    • Make sure that you use the correct refrigerant (or coolant) and refrigerant oil, as using the wrong formula will reduce system performance. It will also cause serious damage to the component. To know when to do this procedure, consult your owner's manual or call up Chevrolet's hotline. The schedule for changing coolants depends on how old your vehicle is. Also, even if you're having a professional mechanic do this, you should still verify that he will use the correct fluid and oil by asking him.
    • Always replace the A/C dryer whenever the system is opened for repairs.
    • Replace the cabin air filter following the instructions given in the owner's manual. Do this every 15,000 miles. Do not try to clean the filter and reinstall it. Also, keep basic hand tools with you. You may need to use tools to remove the old component or install a new one.