how do I troubleshoot my Toyota Corolla E170 (2013-2019) AC not blowing cold air?

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

593 words

Problem Statement

Learn how to troubleshoot and fix the AC not blowing cold air in a 2013-2019 Toyota Corolla E170. Step-by-step guide with diagnostic 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 components
•Wear safety goggles and gloves when handling refrigerants

Symptoms

•AC system blowing warm air
•AC compressor not engaging
•Unusual noises from the AC system
•Condenser fan not operating
•Presence of refrigerant leaks (oil residue around fittings)
•AC control panel lights may not illuminate properly

Diagnostic Steps

1
Inspect the AC control settings to ensure they are set correctly (temperature, mode, fan speed)
2
Scan for error codes using an OBD-II scanner to check for any AC-related fault codes
3
Check the refrigerant levels using a manifold gauge set to determine if it's low
4
Inspect the AC compressor for proper operation; listen for clicking sounds indicating engagement
5
Examine the fuses and relays related to the AC system for any blown fuses or faulty relays
6
Visually inspect the AC condenser and evaporator for obstructions or damage

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
•Multimeter
•Socket set
•Torque wrench
•Safety goggles
•Safety gloves

Parts Required

•Refrigerant (R-134a)
•AC compressor (if faulty)
•Fuses (if blown)
•Relay (if faulty)

Related Faults

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Diagnostic Steps

1
Inspect the AC control settings to ensure they are set correctly (temperature, mode, fan speed)
2
Scan for error codes using an OBD-II scanner to check for any AC-related fault codes
3
Check the refrigerant levels using a manifold gauge set to determine if it's low
4
Inspect the AC compressor for proper operation; listen for clicking sounds indicating engagement
5
Examine the fuses and relays related to the AC system for any blown fuses or faulty relays
6
Visually inspect the AC condenser and evaporator for obstructions or damage

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface with the engine off.
Disconnect the battery before starting work on electrical components.

2. Recharge the Refrigerant

Tools Required: Manifold gauge set, refrigerant (R-134a), safety gloves, safety goggles.
Sub-steps:
1. Connect the low-pressure side of the manifold gauge set to the service port on the AC system.
2. Start the engine and turn on the AC to the maximum setting.
3. Monitor the pressure readings; if low, proceed to add refrigerant.
4. Slowly add refrigerant until the correct pressure is achieved (refer to the vehicle's specifications for exact values).
5. Disconnect the manifold gauge set and replace the service port cap.

3. Replace Faulty Components

Tools Required: Socket set, torque wrench, screwdrivers.
Sub-steps:
1. If the AC compressor is not engaging, disconnect the electrical connector and check for voltage using a multimeter.
2. If no voltage is present, trace the wiring back to the AC relay and fuse; replace any faulty components.
3. If the compressor is faulty, remove the old compressor by disconnecting the refrigerant lines and electrical connections, then unbolting it from the engine.
4. Install the new compressor and ensure all connections are tight.
5. Refill the AC system with the correct amount of oil (if applicable) and refrigerant.

4. Check and Replace Fuses/Relays

Tools Required: Fuse puller, multimeter.
Sub-steps:
1. Locate the fuse box and identify the fuses associated with the AC system.
2. Remove and inspect each fuse; replace any blown fuses with the correct amperage rating.
3. Test the relays using a multimeter for continuity; replace any faulty relays.