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how to fix the AC not blowing cold air in GMC Sierra T1XX (2019-Present) - GMC Sierra
Home/Cars/GMC/Sierra/T1XX (2019-Present)/how to fix the AC not blowing cold air in GMC Sierra T1XX (2019-Present)

how to fix the AC not blowing cold air in GMC Sierra T1XX (2019-Present)

GMC Sierra T1XX (2019-Present)

Error Codes
2-4 hours
Time
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
3 min read
552 words

Problem Statement

Learn how to diagnose and fix the AC not blowing cold air in GMC Sierra T1XX. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component
HVAC
Estimated Time
2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

  • •Disconnect battery before working on electrical systems
  • •Allow the engine to cool down before inspecting components

Symptoms

  • •AC system blowing warm air
  • •Increased cabin temperature
  • •Unusual noises when the AC is activated
  • •AC compressor not engaging
  • •AC refrigerant low pressure warning
  • •Condenser or evaporator frost buildup

Diagnostic Steps

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

  • ✓Test the affected component to ensure it functions correctly
  • ✓Check for any error codes or warning lights
  • ✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

  • •Follow the manufacturer's recommended maintenance schedule
  • •Address warning signs early before they develop into major issues
  • •Use quality parts and fluids recommended for your vehicle
  • •Keep detailed records of all repairs and maintenance

Tools & Equipment Required

  • •OBD-II scanner
  • •Manifold gauge set
  • •Refrigerant canister with R-134a or R-1234yf
  • •Multimeter
  • •Socket set
  • •Screwdrivers

Parts Required

  • •Refrigerant
  • •Cabin air filter
  • •AC compressor
  • •AC condenser or evaporator
  • •Fuses and relays

Additional Information

Affected Component
HVAC
Estimated Time
2-4 hours
Difficulty
medium
Severity
medium
Tools Required
6 items
Parts Required
5 items

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Solution
1. Preparation
  • Gather tools and parts required.
  • Ensure the vehicle is parked on a level surface, and the engine is turned off.
  • Disconnect the negative battery terminal for safety.
2. Recharge Refrigerant
  1. Connect Manifold Gauge Set
    • Attach the low and high-pressure gauges to the corresponding service ports on the AC system.
  2. Check Pressure Readings
    • Evaluate the pressure readings on the gauges to confirm if the system is low on refrigerant.
  3. Add Refrigerant
    • If low, connect a refrigerant canister to the low-pressure side and add the manufacturer-recommended refrigerant (typically R-134a or R-1234yf).
    • Monitor pressure closely while adding refrigerant to avoid overcharging.
3. Inspect and Replace Components
  1. Inspect AC Compressor
    • Check for any signs of wear or damage; replace if necessary.
  2. Inspect Condenser and Evaporator
    • Clean any debris from the condenser. If damaged, replace the condenser or evaporator.
  3. Replace Cabin Air Filter
    • Open the cabin air filter housing, remove the old filter, and install a new one.
4. Electrical System Check
  1. Inspect Fuses and Relays
    • Locate the fuse box, check the AC fuse and relay, replace if blown or faulty.
  2. Test AC Compressor Clutch
    • Use a multimeter to check for power at the compressor clutch connector; repair wiring if necessary.