I noticed my new 2008 Mazda 3 GT Sport air con tends to cut in and out even when I did not turn the air con on and it's freezing in the Canadian North. When the clicking of the air con clutch is heard, the cooling radiator fan starts to run. After like 5 seconds, the air con cuts out and the fan stops too. This happened even after the car is at operating temperature.
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Solution: 1. The engine has Idle Air Controller (IAC) that is suppose to keep the engine speed at a constant (even with changing load - AC, FAN, etc.) If the IAC is broken your idle will be rough or even die. The AC compressor places a large load on your engine.If there is a problem with your IAC(Idle air controller)which is located on the throttle body it will cause the vehicle to die when you turn the AC on.Remove the IAC and check it for carbon.If there is carbon try to clean it up with a wire brush. 2. If your air con is drawing more power than your alternator/battery is capable of supplying - you could try fitting a higher charge rate alternator and a heavy duty battery also ensure battery to chassis earth is sound and clean of rust and grime at metalwork. 3.Another reason for this is that when the air con is on, ice and water forms on the outside of the air con pump and condenser. This ice and water can spray around the engine bay and if there is any electrics that are around it can cause a short circuit.The easy way to fix this is to identify the air con pump and condenser, then spay WD40 on all the electrical components you can see in the direct area. WD40 displaces water and will cause no problems with the cars electrics.
the blower motor has no affect on the AC system, start the engine and turn on AC and watch the AC compressor to see if clutch engages,if it doesn't the system isn't full,if you are correct the clutch should be engaged and should quit when you change heater speeds,
Happened to me too, when the ECO light comes on automaticly (and it only blows hot air) it means it's simply broke.
I don't know the exact production date of your car, but there is/was an airco-related dealer recall for some cars, so just contact your dealer and have it fixed, but don't forget to mention the recall (it might save you a lot of money when your warranty has already expired).