why do i not get heat when i turn on my heater? it blows cold air on 1994 Nissan 300ZX

when i turn my heat on it blows cold air i never get heat but the blower is working good.

by in Leesburg, VA on December 07, 2012
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2 answers
ANSWER by , December 07, 2012
Possibly a broken blend door or blend door actuator.
ANSWER by , December 07, 2012
ck heater control valve operation