A.c. flaps

Asked by Jul 02, 2019 at 03:27 PM about the 2005 GMC Sierra 1500

Question type: Maintenance & Repair

I have a GMC Sierra truck. The a.c. works
fantastic..for the most part...all of the
sudden cold air stops...blower still blowing.
Some times turning vehicle off and back on,
the air gets cold...now the only time the air
gets cold is when you hear a flap...like a
plastic door sucked shut.  Is this nutty...or is
there a logical reason....please help...plus do
I have a cabin air filter...truck is such a
puzzle!!

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