Cold air blowing instead if heat on 1994 Chevrolet Suburban 1500

I've replace my thremostat and my heater is still blowing out cold air. What could be the prolem?

by in Des Moines, IA on March 09, 2011
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2 answers
ANSWER by , March 09, 2011
This could be caused by low coolant level, air trapped in the cooling system, or a plugged/clogged heater core.
ANSWER by , May 10, 2012
Most common problem is low coolant.