1994 Honda civic has no heat when I swict from ac to heat
no, slide normal, yes, no all the time
The problem could just be the heater valve cable has slipped off the heater valve arm.
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Slip the heater valve cable back onto the heater valve arm. Then cut yourself a 10 mm length of 3.5 mm vacuum hose (P/N 95005-35008-10M, H/C 2325058), and slide it onto the arm. This holds the cable on the arm nice and snug so it won't slip off.