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Message: <blockquote data-quote="jfmorris" data-source="post: 25370" data-attributes="member: 13408">Having owned a 2003 Yukon, and currently owning a 2006 Silverado, I can directly relate with that one about the missing cabin air filter. They even MOLDED the housing to where it still kinda looked like there was an air filter in the spot the 2002 and earlier would have had it, but you should couldn't pull anything out.Skimping on the air filter means clogged evaporator coil fins over time, unless you keep the unit on recirc all the time.  I've cleaned them myself by removing the blower, pulling out and vacuuming out all sorts of leaves and debris, then spraying foaming coil cleaner in there to get what I could reach of the coils, then literally hosing it out - all sorts of brown water ran out the drain tube on the firewall for a while.  But - made a huge difference in airflow getting decades of dirt out of those evaporator coils. If they had just kept the air filter, none of that would have reached the coils.</blockquote>