How long were you driving before the A/C started blowing warm air?.Are all of the vents getting warm, or just one?.Help our technicians diagnose the culprit that's causing your A/C to blow cold then warm by taking note of the following: While this helps prevent dangerous electrical fires, it also means that a simple, single blown fuse could cause your entire A/C system to shut down. If just one of these parts fails, your A/C could shut down and start blowing warm air. Under normal operating conditions, these pieces and parts work together to deliver power to the A/C unit, giving you cool air – on demand. Your car's A/C system is made up of a jungle of wires, switches, relays, and fuses. Make note of puddles of water under your car – this could be a sign of a freezing problem and can help your technician diagnose the problem. This is sometimes called a "flooded" evaporator, a problem that will also leave you with warm air.Īs the system continues to try to modulate the expansion valve or cycle the compressor, the flow rate of the refrigerant can normalize, which is when you might notice the air temperature start to cool again. A large restriction of refrigerant will also result in your A/C blowing warm air.Ĭontrary to what you might think, too much refrigerant flowing into the evaporator doesn't lead to cooler air. A buildup of frost or ice can make the operation even worse inside the system. So cold, in fact, that frost or ice can build on the outside of that part/hardware. If the valve is blocked, the refrigerant flow could be restricted or could be too unrestricted.Ī slight restriction of refrigerant flow can cause that mechanical part/hardware to get very cold. 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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