my Volkswagen Golf MK7.5 (2020-Present) AC is blowing warm air after a recharge, why?

Volkswagen Golf MK7.5 (2020-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

593 words

Problem Statement

Complete guide to fixing AC that blows warm air in Volkswagen Golf MK7.5. Includes symptoms, diagnostic steps, tools required, and repair procedures.

Affected Component

HVAC

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems
•Ensure the system is properly evacuated before opening the refrigerant lines

Symptoms

•AC system blows warm air
•AC compressor does not engage
•Unusual noises from the AC compressor
•Increased humidity inside the vehicle
•AC system leaks refrigerant evidenced by oil stains
•Intermittent cooling (cools briefly then warms up)

Diagnostic Steps

1
Scan for error codes using OBD-II scanner
2
Inspect refrigerant levels using a pressure gauge
3
Check AC compressor operation to see if the clutch engages
4
Examine AC system components for leaks or damage
5
Test AC relay and fuses to ensure they are functioning correctly
6
Assess cabin air filter for clogs that may restrict airflow

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
•Pressure gauge
•UV leak detection kit
•Socket set
•AC flushing kit
•Vacuum pump
•Recharge kit

Parts Required

•AC compressor (if faulty)
•Refrigerant
•Oil for AC system
•Hoses or seals (if leaks are found)

Related Faults

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Diagnostic Steps

1
Scan for error codes using OBD-II scanner
2
Inspect refrigerant levels using a pressure gauge
3
Check AC compressor operation to see if the clutch engages
4
Examine AC system components for leaks or damage
5
Test AC relay and fuses to ensure they are functioning correctly
6
Assess cabin air filter for clogs that may restrict airflow

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and the engine is off.
Disconnect the battery to prevent any electrical issues.

2. Inspect and Repair Leaks

Sub-step 1: Use a UV leak detection kit to identify any refrigerant leaks in the AC system.
Sub-step 2: If leaks are found, replace the damaged hoses, seals, or components as needed.
Sub-step 3: Recharge the system with the correct amount of refrigerant after repairs.

3. Replace AC Compressor (if faulty)

Sub-step 1: Remove the serpentine belt by using a socket wrench to relieve tension on the tensioner.
Sub-step 2: Disconnect the electrical connector from the AC compressor.
Sub-step 3: Remove the AC lines connected to the compressor, taking care to collect any residual refrigerant.
Sub-step 4: Remove the mounting bolts and take out the old compressor.
Sub-step 5: Install the new compressor, ensuring all connections are secure and properly torqued.
Sub-step 6: Reconnect the serpentine belt.

4. Flush and Recharge the AC System

Sub-step 1: Use an AC flushing kit to clean out the system if contamination is suspected.
Sub-step 2: Vacuum the AC system using a vacuum pump for at least 30 minutes to remove moisture.
Sub-step 3: Recharge the system with the specified amount of refrigerant and oil as per the manufacturer’s specifications.