A/c blower my a/c blower only wants to blow on hi speed all other speeds dont wk.

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.

didnt specify vehicle --generic answer --check fuses and relays ---will need to test fan speed switch selector--fan speed resistor --blower motor
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possible bad switch... possible loose wires to the switch and or motor...

Dont use speed 4 untill you have had the speed resistor in fan replaced or repaired

REPLACE BLOWER MOTOR RESISTOR. IF YOU GET ONLY ONE CONTROL SPEED.IF YOU HAVE ALREADY REPLACE BLOWER MOTOR RESISTOR.BLOWER MOTOR CONTROL SWITCH BAD. REASON BLOWER STAY ON ALL THE TIME.FAN BLOWER MOTOR RELAY BAD.
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The blower motor resistor is usually only switched into the circuit for the lower speeds and for the fastest speed the resistor is bypassed so I guess the motor needs to be replaced if it does not work in any position. However, sometimes the blower motor is not protected by a fuse but by an automatically resetting sealed circuit breaker usually located not far from the motor. The circuit breakers dont fail very often, If the fan works for a few seconds and then stops and then does the same thing several minutes later then the fan motor definitely needs replacing.

There is a HVAC relay and FUSE in the under hood fuse box, have you check both of these? If the blower works on any speed, the blower is good. You say it blows on lowest speed? The blower speed resistor is mounted on the blower housing. The HIGH SPEED BLOWER RELAY is mounted on the blower motor. You may have multiple problems but check fuses first, if all is OK, then a qualified repair shop will need to check further. You do NOT need the whole A/C system replaced. If it does blow cold, thats good, you just need the blower working.

Blower motor is likely bad if it doesn't work on any speed, if it works on only one speed then there is a resistor located by the blower motor that is bad each item should run around $30 at local parts store

Your blower moter is under your glovebox and very easy to replace.I dont think thats your ploblem.I would pull off the dash.It will snap right off without breaking anything.Then pull out the part that holds the selector switch for the fan speed.Then you unplug that switch.Clean the copper contacts.Plug it back in.If everything works again like it should and did in my truck then it is either that switch that is bad or the wiring harness.I would replace that switch.

Check the ground, the resistors are accully resisnting the Negitive Current.