Toyota Highlander Third Generation (2014-2019) AC not blowing cold, how can I fix it?

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

558 words

Problem Statement

Learn how to diagnose and fix the AC not blowing cold in Toyota Highlander (2014-2019). 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 the battery before working on electrical components.
•Always recover refrigerant in accordance with local regulations before opening the AC system.

Symptoms

•AC system blowing warm or hot air
•AC compressor not engaging
•Unusual noises from the AC compressor
•Refrigerant leak or oily residue around AC components
•Reduced airflow from the vents

Diagnostic Steps

1
Inspect the AC system for visible signs of damage or leaks.
2
Check refrigerant levels using a manifold gauge set.
3
Scan the vehicle's onboard computer for diagnostic trouble codes (DTCs) related to the AC system.
4
Test the AC compressor clutch operation with a multimeter.
5
Examine the AC fuses and relays for any blown components.

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

•Manifold gauge set
•Refrigerant canister
•Multimeter
•Socket set
•Torque wrench
•Screwdriver set
•Refrigerant recovery machine

Parts Required

•AC compressor (if defective)
•AC condenser (if defective)
•Refrigerant

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Diagnostic Steps

1
Inspect the AC system for visible signs of damage or leaks.
2
Check refrigerant levels using a manifold gauge set.
3
Scan the vehicle's onboard computer for diagnostic trouble codes (DTCs) related to the AC system.
4
Test the AC compressor clutch operation with a multimeter.
5
Examine the AC fuses and relays for any blown components.

Solution

1. Preparation

Gather all necessary tools and parts.
Ensure the vehicle is parked on a level surface and the engine is off.
Disconnect the battery to ensure safety during repairs.

2. Check and Recharge Refrigerant

Tools Required: Manifold gauge set, refrigerant canister
Sub-steps:
1. Connect the manifold gauges to the low and high-pressure service ports.
2. Start the engine and turn on the AC to the maximum setting.
3. Monitor the pressure readings; they should indicate if the system is undercharged.
4. If low, add refrigerant according to the manufacturer’s specifications.
5. Disconnect the gauges and check for cold air at the vents.

3. Inspect and Replace AC Compressor (if necessary)

Tools Required: Socket set, torque wrench, AC compressor replacement kit
Sub-steps:
1. Remove the serpentine belt by releasing the tensioner.
2. Disconnect the electrical connectors from the AC compressor.
3. Remove the mounting bolts securing the compressor and take it out.
4. Install the new compressor by reversing the removal steps and torque the bolts to manufacturer's specifications.
5. Reconnect the electrical connectors and serpentine belt.

4. Replace AC Condenser (if necessary)

Tools Required: Screwdriver set, socket set, refrigerant recovery machine (if applicable)
Sub-steps:
1. Remove the front grille and radiator support to access the condenser.
2. Disconnect the refrigerant lines from the condenser (ensure recovery of refrigerant if required).
3. Remove the mounting bolts and carefully extract the condenser.
4. Install the new condenser, reconnect lines, and ensure there are no leaks.
5. Reassemble the front grille and radiator support.