Question about Toyota Sienna
The rubber belt which turns your A/C compressor is loose or worn out. What is happening is when you turn on the air conditioner, the belt is slipping trying to turn the compressor and it is heating up as it slips, (serpentine belts can take a lot of heat) and when it gets hot enough, it will eventually grab the compressor pulley and start turning it. If you have not had the belt replaced since you have owned your vehicle, then replace it. Before you replace it and spend money, check to see if it is loose. A loose belt would squeal. You can also try to spray a little bit of WD-40 (don't spray alot) on the pulley wheel and see if the noise goes away.
Posted on May 16, 2010
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Posted on Jan 02, 2017
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