SOURCE: 2001 chevy s10 no heat
remove the heater hoses at heater core and backflush heater core with a water hose it is clogged
SOURCE: 2004 Chevy Suburban a/c and heating issues
see if theres power to the rear blower motor go under the rear and see if the one pipe is cold and the other is hot or at least warm if there the same then the rear system is plugged
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