2017 Subaru Forester Ac Blows Warm On One Side

Introduction

Experiencing warm air blowing from one side of your 2017 Subaru Forester’s AC while the other side blows cold? This is a common issue that can be incredibly uncomfortable, especially during hot weather. Addressing this problem promptly is essential for maintaining a comfortable driving environment and preventing potential further damage to your AC system. This guide will walk you through the troubleshooting steps to identify and potentially fix the issue yourself.

Common Causes of 2017 Subaru Forester AC Blows Warm on One Side

Here are some of the most common reasons why your 2017 Subaru Forester’s AC might be blowing warm air on one side:. For more related activities, check out our Ac Freezing Causes.

• Low Refrigerant: Refrigerant is the lifeblood of your AC. A leak can cause low levels, leading to uneven cooling.
• Blend Door Actuator Malfunction: The blend door controls the mix of hot and cold air. A faulty actuator can get stuck, causing warm air on one side.
• Clogged Cabin Air Filter: A dirty filter restricts airflow, potentially affecting the cooling performance on one side.
• Refrigerant Leak: Leaks can develop in various parts of the AC system (condenser, evaporator, hoses), leading to low refrigerant and uneven cooling.
• Blocked Evaporator Core: Debris or corrosion can block part of the evaporator core, reducing cooling capacity.
• Compressor Issues: A failing compressor might not be able to adequately compress the refrigerant, leading to reduced cooling.
• Air in the System: Air trapped in the AC lines can disrupt refrigerant flow and cooling efficiency.
• Damaged or Kinked AC Lines: Damaged AC lines can restrict the flow of refrigerant.

Symptoms Checklist

Use this checklist to confirm the issue:

• One side of the AC vents blows warm air, while the other blows cold.
• AC performance is weaker than usual overall.
• You might hear unusual noises from the AC compressor.
• The temperature difference between the driver and passenger side vents is significant.

How to Fix 2017 Subaru Forester AC Blows Warm on One Side Step-by-Step Guide

Follow these steps to troubleshoot and potentially fix the problem:

1. Check the Cabin Air Filter: Locate the cabin air filter (usually behind the glove box). Remove and inspect it. If it’s dirty, replace it with a new one. A clogged filter restricts airflow.
2. Inspect the AC Compressor: Open the hood and locate the AC compressor. Ensure the compressor clutch is engaging when the AC is turned on (you should see the center of the compressor pulley spinning). If it’s not engaging, the compressor might be faulty.
3. Check for Refrigerant Leaks: Visually inspect the AC lines, compressor, condenser, and evaporator (if accessible) for signs of leaks (oily residue).
4. Test Vent Temperatures: Use a thermometer to measure the air temperature coming from each vent. Record the readings for comparison. A significant difference indicates a problem.
5. Listen for Unusual Noises: Pay attention to any unusual noises (hissing, gurgling) coming from the AC system, especially when the AC is turned on. These noises can indicate leaks or other problems.
6. Check the Blend Door Actuator: The blend door actuator controls the flow of hot and cold air. Try adjusting the temperature from hot to cold and listen for the actuator motor operating behind the dashboard. If you don’t hear anything or hear clicking, the actuator may be faulty. (Location varies, consult your repair manual or online diagrams for your specific vehicle).
7. Verify proper Freon Level: This is best done by a professional, as it requires specialized tools. However, many auto parts stores offer free AC system checks that can give you an indication of your freon level.
8. Reset the AC System (if applicable): Some vehicles have a procedure to reset the climate control system. Consult your owner’s manual or search online forums for instructions specific to your 2017 Subaru Forester.
9. Check the Condenser Fins: Inspect the condenser (located in front of the radiator) for bent or damaged fins. Straighten them carefully with a fin comb if necessary to improve airflow.
10. Inspect AC Lines: Carefully inspect all the AC lines for kinks, damage, or corrosion. Replace any damaged lines.
11. Look for Blockages: Check the area around the evaporator drain for any signs of blockages (leaves, debris) that could restrict drainage and affect cooling performance.

Fix the Issue Without Buying Parts

Here are some free methods to try before replacing parts:

• Cabin Air Filter Cleaning (Temporary): If a new filter isn’t immediately available, gently vacuum the existing filter to remove loose debris. This is only a temporary fix.
• Visual Inspection: Thoroughly inspect all visible AC components for obvious signs of damage or leaks.
• Condenser Cleaning: Gently rinse the condenser with a garden hose to remove dirt and debris. Avoid using high pressure, as it can damage the fins.

When Replacement Might Be Necessary

If troubleshooting doesn’t resolve the issue, you might need to replace parts. Common culprits include:

• Blend Door Actuator: A faulty actuator can cost between $100 and $300 to replace (parts and labor).
• AC Compressor: A failing compressor can be expensive, ranging from $500 to $1200+ for parts and labor.
• Refrigerant Leak Repair: The cost of repairing a refrigerant leak varies depending on the location and severity of the leak. Expect to pay $150-$600.

Safety Warning

• Always wear safety glasses when working on your vehicle.
• Disconnect the negative battery terminal before working on any electrical components.
• Refrigerant is harmful. Avoid contact with skin and eyes. Discharge the AC system professionally before opening any lines.
• Work in a well-ventilated area.

Tools You May Need

• Screwdrivers (Phillips and flathead)
• Socket set
• Wrenches
• Thermometer
• Safety glasses
• Work gloves
• Fin comb (for straightening condenser fins)

FAQ

Here are some common questions:

• Q: How do I know if my AC compressor is bad? A: Signs include weak AC performance, unusual noises, and the compressor clutch not engaging.
• Q: Can I recharge my AC system myself? A: It’s best to have this done professionally, as overcharging or using the wrong refrigerant can damage the system.
• Q: How often should I replace my cabin air filter? A: Check your owner’s manual, but generally every 12,000 to 15,000 miles is recommended.
• Q: Why is refrigerant leaking from my AC system? A: Leaks can develop due to damaged seals, corrosion, or punctures in AC lines or components.

Conclusion

Troubleshooting your 2017 Subaru Forester’s AC issue can save you money and frustration. By following these steps, you can often identify and resolve the problem yourself. However, if you’re uncomfortable working on your AC system, it’s always best to consult a qualified technician. Don’t hesitate to seek professional help if you’re unsure about any aspect of the repair.