The expansion valve removes pressure from liquid refrigerant to allow expansion from a liquid to a vapor state in the evaporator. If your A/C flip-flops from hot to cold and back again, your expansion valve could be failing. A damaged, failing, or worn compressor can't properly compress refrigerant in the A/C system to deliver the cool air you crave. When there's a problem with the compressor clutch, your air conditioner won't blow cool air for long. Since it continuously cycles on and off, it's subject to wear and tear every time you use your A/C. It allows the pulley to engage and disengage from engine power so the compressor is only working when needed. Your A/C compressor clutch is one of the most important parts of a vehicle's air conditioning system. A leak in your A/C system could be causing the unit to blow warm air, since there isn't enough refrigerant in the system to cool things down.Įven worse, the acid can corrode the inside of your compressor, spreading metal fragments throughout your A/C system and causing widespread damage, blockage, and component failure. A leak is typically caused by a mixture of moisture and refrigerant that, when combined, creates a corrosive acid that eats away at seals, valves, and hoses in the A/C system. Any number of culprits could be causing your car A/C to blow cold then warm air, including: A Leak in the A/C SystemĪ small refrigerant leak is the most common reason a car's A/C gradually loses its cool. If it feels like your A/C is playing tricks on you and doesn't blow cold air for long, it could be time to bring your A/C problems to your local Firestone Complete Auto Care. Few things feel better than that cool blast of air! But what if your car air conditioner blows cold and then warm air?

There’s nothing quite like cranking your car's air conditioning up on a hot summer day.

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