Why is the Subaru Legacy's AC not cooling when the car is cold?
3 Answers
Reasons why the Subaru Legacy's AC is not cooling when the car is cold include: no refrigerant in the system, compressor not working, or AC heat dissipation issues. No refrigerant in the system: If there is no refrigerant, a pressure test is needed to check for leaks, and then the system should be refilled. Compressor not working: If there is refrigerant, check whether the compressor is functioning. It might be due to insufficient compressor oil; adding some oil may help. If the compressor is not working, inspect the AC pressure switch, temperature control switch, and related wiring for issues. AC heat dissipation issues: Check the AC's heat dissipation, ensuring the fan is working. Clean the condenser. Dirty AC filter: Replace the AC filter if it is clogged, as a dirty filter can also cause insufficient cooling.
I see your Subaru Legacy's AC isn't cooling, which is a common issue. I've experienced it several times myself - the car turns into a sauna in summer. There could be several reasons: low refrigerant level (especially prone to leaks in older vehicles), a faulty compressor (listen for missing humming sound), or a clogged condenser blocking heat dissipation. The blower fan might also be broken and not pushing air. Last time I checked mine, I first turned on the AC to test the airflow - if there's no air, start by cleaning the filter as excessive dirt can block cold air circulation. If it's a refrigeration system failure, never attempt DIY repairs as the high-pressure system can be dangerous - take it directly to a certified repair shop for leak detection. Regular annual maintenance including filter replacement and refrigerant recharge can prevent major issues.
As someone who frequently tinkers with cars, I start with the basics when solving air conditioning cooling issues. Compressor clutch failure or refrigerant leaks are the main culprits. After starting the car, listen for the compressor sound—if there's no noise, the circuit might be broken. Check if the blower fan is spinning; if it's stuck, clean out the dust. Low refrigerant can be detected with a pressure gauge, but avoid opening the lines to prevent explosion risks. If the condenser is dirty, you can rinse it yourself with a water gun, but turn off the engine and be cautious of hot components. Regular maintenance should include checking pipe connections, as looseness can cause cooling failure. These small actions can easily fix common issues, saving both money and hassle.
