Question about 2004 Toyota Corolla
When the a/c is turned on a whistling sound comes from the ducts
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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