How to How to Fix Car AC Not Blowing Cold
A car AC that blows warm air ruins summer comfort. Diagnose and fix common causes including low refrigerant, failed compressor, and electrical issues.
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0 of 6 steps completedStep-by-Step Instructions
1 Step 1: Check AC Controls
Mike Johnson: "Pro tip: Make sure to double-check this before moving to the next step..."
Step 1: Check AC Controls
Verify AC is on, temperature set to coldest, and fan to highest setting. Ensure recirculation mode is off initially.
2 Step 2: Inspect Compressor Operation
Mike Johnson: "Pro tip: Make sure to double-check this before moving to the next step..."
Step 2: Inspect Compressor Operation
Start engine and turn on AC. Look under hood to see if compressor clutch engages (center of pulley spins). No engagement indicates electrical or refrigerant issue.
3 Step 3: Check for Refrigerant Leaks
Mike Johnson: "Pro tip: Make sure to double-check this before moving to the next step..."
Step 3: Check for Refrigerant Leaks
Inspect AC lines, condenser, and compressor for oily residue indicating refrigerant leaks. Use UV dye kit for precise leak detection.
4 Step 4: Test AC Pressure
Step 4: Test AC Pressure
Connect AC pressure gauge to low-side port. Proper pressure is 25-45 PSI with AC running. Low pressure indicates refrigerant leak.
5 Step 5: Clean Condenser
Step 5: Clean Condenser
Spray condenser (in front of radiator) with water to remove debris. Bent fins restrict airflow - straighten carefully with fin comb.
6 Step 6: Get Professional AC Service
Step 6: Get Professional AC Service
If refrigerant is low, compressor doesn't engage, or pressure is abnormal, professional diagnosis and EPA-certified refrigerant service is required.