How to Fix a/C

Realize that auto AC is basically a refrigerator in a weird layout. It's designed to move heat from one place (the inside of your car) to some other place (the outdoors). While a complete discussion of every specific model and component is well outside the scope of this article, this should give you a start on figuring out what the problem might be and either fixing it yourself or talking intelligently to someone you can pay to fix it.

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2. Become familiar with the major components to auto air conditioning:

o the compressor, which compresses and circulates the refrigerant in the system

o the refrigerant, (on modern cars, usually a substance called R-134a, older cars have r-12 freon which is becoming increasingly more expensive and hard to find, and also requires a license to handle) which carries the heat

o the condenser, which changes the phase of the refrigerant from gas to liquid and expels heat removed from the car

o the expansion valve (or orifice tube in some vehicles), which is somewhat of a nozzle and functions to simultaneously drop the pressure of the refrigerant liquid, meter its flow, and atomize it

o the evaporator, which transfers heat to the refrigerant from the air blown across it, cooling your car

o the receiver/dryer, which functions as a filter for the refrigerant/oil, removing moisture and other contaminants

3. 3

Understand the air conditioning process: The compressor puts the refrigerant under pressure and sends it to the condensing coils.

Understand the air conditioning process: The compressor puts the refrigerant under pressure and sends it to the condensing coils. In your car, these coils are generally in front of the radiator. Compressing a gas makes it quite hot. In the condenser, this added heat and the heat the refrigerant picked up in the evaporator is expelled to the air flowing across it from...