![]() ![]() Solution: Check the connections on the clutch and replace the clutch if there’s mechanical damage to it. Check to see if the clutch is moving now. Get in the car and turn it to AC and go back to the front of your car. This is the clutch and it should be disengaged when your car is running the “heat” mode. You should notice the disk on the pulley side of your compressor is not moving at all. Pop the hood of your car and locate the compressor. Turn your car’s HVAC setting to “heat” to blow hot air. ![]() There’s an easy way to troubleshoot this. The result? Cold air coming from your vents. The air goes through a process that takes all the heat and humidity out of it. Your car sucks in the air from outside as you drive along. It takes a little bit of magic and a whole bunch of science. A lot of people don’t really think about how that cold air gets cranked out of your car’s air ducts even when it’s 100 degrees outside. The compressor is just one part of your car’s HVAC system. In this guide, we’ll give you 8 reasons why your car’s AC compressor isn’t turning on along with some solutions to each problem. It could be the AC compressor not turning on. The good news? Hot air blowing from your vents isn’t a death sentence for your car. Poor grounding, frayed wiring, bad clutch coil, and defective AC pressure sensor switch can also be an issue although less common. Your owner’s manual should be able to tell you where those are located. Another possible issue is a blown fuse and/or relay. If there is a leak, no matter how small, it’ll eventually cause a non-working AC system. If the AC compressor doesn’t turn on, the most common culprit by far is low AC refrigerant. During a hot summer day in the South, this is enough to drive you insane. It’s really frustrating when you flip your car’s AC on and you still get pummeled with hot air.
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