1999 chevy 1/2 ton silverado Z71 4x4 LS
P.S
More info is needed, does it heat at all, and just can't switch from the floor to defrost???? there are two servo motors on the driver side of the heater unit, under the dash. and each of them have a spring loaded linkage. inspect both of these to see that they are ok.
P.S
P.S
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