Blower mortor not working fuse OK. clicking noise when switch moved from low to high and back

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.

Some cars feed the high speed on dash fans thru the ignition switch. So it will only work at low speed for heat and AC..

You need to replace your blower motor resistor!

Not blowing any air , hot or cold ? blower is fine ???? How do you know the blower is fine if not blowing any air ? Doesn't work any speed ? High , low , med. Blower motor , resistor or relay . Watch this video ! Do you have a volt meter , know how to test automotive electrical circuit's ?
Blower Motor Problems Auto Repair Help
Free wiring diagram here http://www.bbbind.com/free_tsb.html Look for the correct fuse's for the blower motor .
Enter vehicle info. year , make , model and engine size. Under system click on HVAC ,under subsystem HVAC controls will pop up automatic. Click search button then first blue link . Look at diagram to see which fuse is for the blower . Test voltage with volt meter

resistor for sure, the switch would have caused all speeds to fail as it only has one moving contact but the tapped wirewound resistor is a common part for this fault.

of the blower motor makes a howling or grinding noise the motor is going bad. blower control modules are common and will not give you all the blower speeds.

Sounds like you may have a bad blower motor resistor.  When they go bad, they usually wipe out all speeds except high.  But could knock out just one or two of the speeds.  It should be located near the blower motor.

Use the diagram at the link below. First check fuses 23 and 37. If good, pull out the blower relay and probe the relay socket with a voltmeter or test light. Turn the key on and turn the blower switch to high. There should be two hot terminals in the relay socket. If good, move your red lead to battery positive and probe the other two terminals. One should be solid ground and the other should show a few volts. If all good, push the relay back in to see if it clicks. If it clicks, move to the blower motor connector. Put your black lead to chassis lead to ground and probe the terminal with the purple wire. It should be hot. If yes, the problem is at the switch. Verify that yhe switch is getting ground on the black wire at the control head connector.
If you can run these tests, you will find the problem. Let me know if you get stuck.



http://www.revbase.com/BBBMotor/Wd/DownloadPdf?id=16596

Blower motor or resistor.

this is not a problem with thw switch or motor. There is a resistor that is mounted inside the dash on the pasenger side that controls the speed of the blwer..these have a tendency to burn up after 10 years or so... replace the resistor, and you will be fine!  http://cgi.ebay.com/ebaymotors/Toyota-Truck-A-C-Heater-Fan-Resistor_W0QQcmdZViewItemQQcategoryZ33548QQihZ016QQitemZ260344846266QQrdZ1QQsspagenameZWDVW#ht_500wt_1230