My blower motor does not work at any speed but if you jump voltage to it it does work. Why?
by 
jrtqm1
ANSWERS: 2
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Not sure what year car. Either bad switch, fuse, or relay. See your owners manual to find out where fuses and relays are located.
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If your car has air conditioning try your blower with the air on, and your blower switch in high. Sometimes another switch is piggy backed into the airconditioning circuit. I have seen many swithes melted down particulary with the Chevy S series pickups. Getting out the old wiring scematic may be needed, however I have never seen a wire fail without a smoke show. My bet is your problem is somewhere prior to the switch or the switch itself. either the control
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