why does my Volkswagen Golf MK7.5 (2020-Present) smell like burning when I turn on the AC?

Volkswagen Golf MK7.5 (2020-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

595 words

Problem Statement

Learn how to diagnose and fix burning smell from AC in Volkswagen Golf MK7.5. 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 systems.
•Ensure proper refrigerant recovery to avoid environmental harm.

Symptoms

•Burning smell emanating from the AC vents
•AC system not blowing cold air
•Unusual noises from the AC compressor
•Increased engine temperature
•Condensate water pooling under the vehicle

Diagnostic Steps

1
Inspect the AC compressor for signs of wear or damage.
2
Check the AC refrigerant level using a manifold gauge set.
3
Examine the serpentine belt for fraying or slipping.
4
Inspect the cabin air filter for dirt and debris blockage.
5
Look for any electrical issues, such as burnt wires or connectors near the AC system.
6
Evaluate the drain hose for clogs or obstructions.

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
•Socket set
•Wrench set
•Refrigerant recovery machine
•Belt tensioner tool
•Small flathead screwdriver

Parts Required

•Cabin air filter
•Serpentine belt
•AC compressor (if found faulty)
•Refrigerant

Related Faults

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Diagnostic Steps

1
Inspect the AC compressor for signs of wear or damage.
2
Check the AC refrigerant level using a manifold gauge set.
3
Examine the serpentine belt for fraying or slipping.
4
Inspect the cabin air filter for dirt and debris blockage.
5
Look for any electrical issues, such as burnt wires or connectors near the AC system.
6
Evaluate the drain hose for clogs or obstructions.

Solution

1. Preparation

Gather tools and parts needed for the repair.
Ensure the vehicle is parked on a level surface and the engine is cool.

2. Inspect and Replace the Cabin Air Filter

Sub-steps:
1. Open the glove box and remove any contents.
2. Release the glove box hinges to gain access to the cabin air filter.
3. Remove the old cabin air filter and inspect it for dirt or damage.
4. Install a new cabin air filter, ensuring it is oriented correctly.
Tools Required: None specific, but a small flathead screwdriver may be helpful.

3. Check and Replace the Serpentine Belt

Sub-steps:
1. Locate the serpentine belt tensioner and use a socket to relieve tension.
2. Remove the old serpentine belt and inspect the pulleys.
3. Install the new serpentine belt according to the routing diagram.
4. Ensure the belt is seated properly on all pulleys.
Tools Required: Socket set, belt tensioner tool (if needed).

4. Inspect and Repair the AC Compressor

Sub-steps:
1. Disconnect the battery to ensure safety while working on electrical components.
2. Remove any obstructions to access the AC compressor.
3. Inspect the compressor for leaks, physical damage, or burnt wiring.
4. If faulty, replace the AC compressor by disconnecting the refrigerant lines (ensure proper recovery and disposal), unbolting the compressor, and installing a new unit.
Tools Required: Wrench set, refrigerant recovery machine, new compressor.

5. Recharge the AC System

Sub-steps:
1. Connect the manifold gauge set to the AC service ports.
2. Start the engine and turn on the AC to the maximum setting.
3. Recharge the system with the correct type and amount of refrigerant.
4. Monitor the pressures to ensure they are within the manufacturer's specifications.
Tools Required: Manifold gauge set, refrigerant.