Question about 2009 Mitsubishi Galant

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Air conditioner blows hot air, coolant is full but still blows hot air, sounds like compressor is coming but a/c light flashes.

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The AC Light flashing can be caused by numerous things, some of which can be very difficult to answer without proper testing. The first thing you need to ask yourself is, "Is the A/C working?" i.e. Is the actual compressor switching on and off. If you hear a clicking sound when you first initialize the A/C that means the clutch is engaging. If you hear a second click, that would be the clutch disengaging for what most likely would be a system shutdown. My first step would be to check the hoses for any signs of obvious leaks, and then check the pressure. Make sure that you check the pressure after the clutch has engaged, and that you have the Max A/C setting enable with full fan.

Depending on the mileage of your car and the usage, it may be something as simple as a recharge. The 09 Galant uses R-134a. If you find that your pressure is dropping continuously, you should take your vehicle in for a thorough A/C analysis, as these are not situations that the average home mechanic can handle easily without the proper equipment. The A/C unit will need to be tested for major leaks, and will most likely need to be discharged and recharged professionally

Posted on Apr 07, 2015

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