Chevy Trailblazer climate control reset instructions:
If the climate control system in your Chevy Trailblazer is broken, it could be the result of potential problems like
electrical malfunctions,
refrigerant leaks,
or even a faulty air compressor. Those are the most common reasons for a Trailblazer’s HVAC system to turn haywire—and depending on the root of the issue, you may need more professional assistance.
But before you rush to your nearest mechanic, it’s worthwhile to
run a climate control reset first. If you suspect the HVAC issue in your Trailblazer is electrical, a system reset can correct minor bugs and restore your HVAC to working order. Below are the steps to follow to re-calibrate your HVAC actuator in a GM vehicle:
Step 1: Turn off the car. When dealing with electrical fuses in your car, it’s best to make sure the engine is off first!
Step 2: Disconnect the battery for one minute. Alternatively, you can remove the HVAC 10 amp fuse in the fuse box, which is typically located in the engine compartment. This can vary by model year, so be sure to check your owner’s manual to confirm the location of your car’s fuse box.
Step 3: Reconnect the battery. If you chose to remove the HVAC amp fuse instead, reconnect it.
Step 4: Start your engine. DO NOT touch the A/C controls yet! First, let the car run for one to two minutes.
Step 5: Turn off the Ignition for 10 to 20 seconds, then restart your engine and test the A/C controls.
Following these steps should
reset your Chevy Trailblazer’s climate controls automatically. But if the A/C’s still not working, it may be time to do some more troubleshooting.
Early Chevy models climate control reset instructions
If you own an older Trailblazer model released in the
early 2000s, you might have to try a different method to reset your climate controls. Upgrades to the Trailblazer’s HVAC controls over the years have made the process of resetting newer systems slightly different than in older ones. If you own an early 2000s Trailblazer,
try these steps instead:
Step 1: Park your vehicle outside (or keep the garage doors open) and turn on your key. All in all, re-calibrating your A/C will take about 5-7 minutes and require you to run your car for at least two minutes.
Step 2: Set the A/C on auto control. Even if your system isn’t working properly, let it automatically take over for now while you continue with the reset.
Step 3: Turn the ignition back off. Make sure the A/C is still set on auto; when your car starts again, it should automatically turn on the A/C too, which is necessary for recalibrating the system.
Step 4: Locate the fuse box. Keep your engine off for this part! Most of the time, you’ll find your fuse box in the engine compartment beneath the hood, toward the driver’s side. Sometimes, it will be labeled as the “Fuse and Relay box.” Its exact placement can vary by model year, so you may need to consult your owner’s manual for the exact location in your Trailblazer.
Step 5: Locate and remove the HVAC battery fuse. Once you remove the cover, you’ll notice markings inside the lid that serve as a diagram of your fuse box, and you can use it to figure out which fuse is the HVAC battery fuse. Look for a
red 10-amp fuse.
Step 6: Inspect the HVAC battery fuse. If it’s blown, now is the perfect time to replace it. If it’s not,
wait 60 seconds before reconnecting it. Your HVAC ECM needs at least a minute to reset itself. After a minute, you can reinstall the fuse; this should restore your car’s A/C back to factory mode.
Step 7: Start your engine. Your A/C should automatically start blowing—and it should also be automatically set at 74 degrees. This is the original temperature at which your A/C was set in the factory and a sign that your system is resetting itself. DO NOT touch your A/C controls for at least 60 seconds.
Step 8: Shut off the engine for 10 to 20 seconds. Make sure you don’t leave it off for longer than 30 seconds, or the reset may not work.
Step 9: Start your vehicle and test the A/C.
If all your A/C needed was a quick calibration, your system should be back to functioning like normal. If not, the problem could be related to something else.
Other reasons your Chevy Trailblazer A/C isn’t working:
Re-calibrating your Chevy’s A/C can solve simple electrical issues with your climate controls… most of the time. But
if your reset attempt fails, you may be dealing with a different issue. Here are a few other reasons your Chevy Trailblazer’s A/C could be failing:
Refrigerant leak
Refrigerant leaks are a common problem when it comes to A/C malfunctions. Without adequate levels of refrigerant in your HVAC system, your A/C loses its cooling capacity.
Luckily, it’s an easy fix—just
refill the refrigerant levels and you’re good to go! Just make sure that you
find and seal any leaks to prevent the problem from recurring.
A/C Compressor Failure:
If it’s not a blown fuse or refrigerant leak, the issue could be with your A/C’s air compressor. The A/Cr compressor is central to your A/C: it works together with your condenser to cool the air that’s blown out of your car’s vents. When your A/C Compressor—or the relay that powers it—stops working properly, so does your HVAC system. In this case, you’ll need an
A/C compressor replacement.
Dirty Cabin Air Filter:
Replacing your cabin air filter is a regular part of Chevy
basic car maintenance —but if you haven’t cleaned or replaced yours in a while, you may start to notice a dip in your A/C’s performance. A dirty cabin air filter will result in reduced airflow and ventilation—and the added strain on your A/C and engine could lead to lower fuel economy if left alone. Most manufacturers recommend replacing your cabin air filter every
10,000-20,000 miles or so, but cleaning it regularly may help it last a little longer.
Bad Blower Motor:
A loss of A/C airflow in your Chevy Trailblazer could be the result of a
bad blower motor. If yours is broken, you’ll have to replace it entirely.
Faulty Blend Door Actuator:
If you notice a
clicking or light tapping sound coming from beneath your dashboard, a faulty
blend door actuator could be to blame. Blend door actuators help control airflow in your Trailblazer’s cabin, but if yours is on the fritz you may experience a problem with controlling your A/C’s temperature—such as only getting hot air and no cold air, or the other way around.
To fix it, you’ll need a mechanic’s help.
How to Diagnose a Chevy Trailblazer climate control malfunction
The problems above are just
some of the potential reasons your Chevy Trailblazer’s A/C could be malfunctioning. But they’re not the only potential causes of A/C malfunctions—a dirty or clogged condenser, dirty evaporator, or even a wonky wiring harness could be behind the issue.
Before you address your A/C malfunction, it’s important to know what’s at the root of the problem before attempting to make a repair. If you have an onboard diagnostics (OBD) scan tool, you can get an
OBD code or trouble code to help narrow down the source of the issue. Alternatively, you can bring your Chevy to a local mechanic for more professional assistance. If you choose the mechanic route, be sure to work with someone that’s
Trained and Certified in HVAC repairs, since working with A/C refrigerant requires additional expertise.
Source and Credit to:
Recalibrating your Chevy Trailblazer’s HVAC system may be all it needs to correct A/C malfunctions, but the process of resetting it can vary by model year.
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