S spastic_crab New member Sep 11, 2010 #1 i have a 93 chevy 2500 with a 350. my heater works fine but it will not kick to defrost. i would think it is a vacuum switch. has anyone had this problem before? is it an easy fix? thanks
i have a 93 chevy 2500 with a 350. my heater works fine but it will not kick to defrost. i would think it is a vacuum switch. has anyone had this problem before? is it an easy fix? thanks