Question about 2004 Toyota Corolla

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Whistling sound from auto ac ducts

When the a/c is turned on a whistling sound comes from the ducts

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The whistling could be an indication of lack of air flow which will cause the evap coil to frost. The frosting could also be an indication of low refrigerant. As a quick & dirty test, here's something to try. After the system has been off long enough for the coil to completely thaw, set the thermostat for "fan on" & open the door to the air handler (or furnace). If you have to pull hard to get it off & air rushes in thru the door opening, you probably have a return air problem.

Read more: http://www.doityourself.com/forum/air-conditioning-cooling-systems/219207-whistling-noise.html#ixzz2xZOyZr5b

Posted on Mar 31, 2014

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Posted on Jan 02, 2017

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