Fuse blows on heater. i replaced resistor, relay, and rotory dial switch on control panel. also unplugged blower motor but fuse still blowed

94 CHEVY Silverado ????,heat/ac fan not blowing. K1500?????? Hear clicking when selecting l'm, SET high but not blowing! WITH AIR OR NO A/C? FIRST IS FUSES, MAKE SURE THE BLOWER FUSE IS NOT BLOWN.
EASY NO? CHECK ALL FUSES FIRST. ON ALL ELECTRICS FAILING OF ANY KIND.
BAD FUSE, BAD WIRINIG , BAD CONNECTIONS. OR EVEN BAD RELAYS TO THE BLOWER OR BAD SWITCH BLOW.
THE OLD CARS , HAD A SPEED BLOW , RESISTOR BLOCK
THAT FAILS ON ALL SPEEDS BUT HIGH, SO ITS NOT THAT.
OWN A VOLT METER????
HERE IT IS, ANY OF THIS CAN FAIL THIS OLD
WE USES A VOLTMETER TO FIND THE POINT OF FAILURE.
A SHORTED BLOWER MOTOR CAN BLOW LEFT SIDE TOP
FUSABLE LINK.RIGHT FUSE BLOWN MAKES THE CONTROLLER DEAD.

Does it blow on medium? It might be a bad blower motor resistor.

What else is connect to that circuit if nothing you most likely have a wire touching metal.

Is this fuse also feeding power to something else that is sucking too much power? when it has blown, what else stops working, because there is no power to it? is it dash lights?, the stereo?, any other thing?

Ok i could be 1 of 3 things blower relay,blower switch or blower motor resistor.First thing to do is check the blower motor resistor by pulling on and wiggling the pigtail to the resistor with the ignition and fan switches on.Then if there is no bad connection i would replace the relay and if no change afterwards replace the fan switch.

sounds like the blower resistor,check to see if you have power to the blower if so then it's the blower motor,if not could be the resistor,fuse,relay,or control switch.









TIM............

OK. So the blower notor isn't operating. Do you have power to the blower motor? The resistor is new from what I got. If you don't have power to the blower motor, then check the speed control switch and fuses. If you have power at the blower motor, replace the blower motor

REPLACE OR CHECK BLOWER MOTOR FUSE + RELAY.IF BOTH GOOD PROBLEM IS THE BLOWER MOTOR IS BAD OR THE HEATER AND AC CONTROL SWITCH BAD ALSO BLOWER RESISTOR.

Check for a bad fuse.

Check the blower motor resistor. It could have a broken connection in it.