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Why is my car AC blowing hot air?

Oh no...... the first heatwave of the year and your car is HOT!!!???  If you are plagued with hot air from the air conditioning ducts in your car here are three key items to check:

Why is my AC blowing hot air?

A/C Indicator Lamp

Is the indicator lamp on the HVAC control panel illuminating when the air is turned on? If not first make sure that all of your settings are correct for AC cooling operation. If the indicator is still on verify that there are no other warning lights on the dashboard that may inhibit the car's air conditioner operation. If all of the above is correct an inoperative AC indicator may be a symptom of an electrical system fault. Have the system inspected by a certified mechanic. 

Poor Airflow

When the system is turned on and the blower engaged you should feel forceful airflow from the dash vents. If the airflow is poor the cooling ability will be adversely affected. Check the fresh air intake and cabin filter for leaves and debris. 

Low Freon Charge

One of the most common concerns for an air conditioner system that is blowing warm air is the lack of refrigerant.  This can be difficult to test without the proper specialty tools. Air conditioning refrigerant is colorless and odorless. One item to take notice of is when the AC is turned on you should hear a click when the compressor clutch is engaged. If you hear a rapid on and off click from the compressor clutch this may be an indication of low charge. Your mechanic will test the system for leaks prior to recharging the system. 

When all else fails have your car scheduled for an air conditioning performance test. Your service advisor will advise you of the proper route to repair. 

R134A AC Refrigerant

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Air Conditioning