My AC Makes a Whistling or Hissing Noise. When the A/C is activated the compressor is … 3. My 1996 camry makes a squealing/whistling noise whenever i turn on the AC. After the alternator was installed, I started my car up and when I eventually turned the Air conditioner on, it started making a screeching/squealing type noise. When any of these belts begin to slip, the resulting friction can cause a piercing squeal. Squealing sounds are perhaps the most common complaint from drivers. What it means: This could come from worn or loose accessory belts that drive things like your power steering pump, air conditioner compressor and alternator. If i dont switch off the AC, the noise stops automatically after 5-6 seconds. SYMPTOM SUMMARY A loud squeal is produced when the A/C is turned on.. USUAL CAUSE This symptom is usually caused by a loose or worn air conditioning compressor belt. There are times, though, where you might hear a squealing noise when you engage the air conditioning system. The alternator, power steering pump, water pump, and air-conditioning compressor may all be connected to this serpentine belt. I was later told the ac compressor was bad so I had it replaced. Video: Checking a Noisy Blower Motor. DIAGNOSE – I HEAR A LOUD SQUEAL WHEN A/C IS TURNED ON By Carl O’Reilly. Please help. Older cars may not have a serpentine belt, but they do have different V-belts that drive different systems. 7. What could it be responsible for this? So I popped the hood w/ the AC on and noticed the sound came from the vicinity of the timing belt. Have your mechanic identify which one it is and … Does … There are many types of unfamiliar noises that could come from under the hood of a car when something failed to work properly. I Can Hear a Vibration Type of Sound. 5. The noise stops the moment I switch off the AC. Normally, you should hear or feel nothing when the air conditioner is working except the cold air coming from your car’s heating/cooling ducts. It’s designed to operate quietly and unobtrusively, so there should be little to no noise from an air conditioning system that’s in … I was first told it was the belt needed some lubrication but that didn’t help. So I parked the car and revved the engine stopped, then turned the AC on. Most people are interested in the noises their system shouldn’t be making. AC System Noises as a Diagnostic Tool to … the battery light came back on and the screeching got infinitely louder. 6. Earlier, this used to happen rarely, but of late.. say once in 2-3 days. The situation: When your air conditioner turns on, the outside unit makes a very loud screeching noise — like metal on metal.The sound persists until the unit shuts off. 1. Most likely cause: The fan motor bearings are shot.If this is the case, you’ll need to have your fan motor replaced. 4. How to fix a squealing AC Using a motor lubricant or spray lubricant on the motor shaft can temporarily relieve the noise. 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