What makes you think there is a relay to be found? I have yet to encounter a heater blower circuit that includes a relay, though some vehicles do have an ignition relay - that closes when the ignition is switched on and energises several circuits.
SOURCE: The heater / ac blower
It is the blower resister. I purchasted one at auto zone for $18.00. It is located under the passenger side dash. You need to remove the glove box and the plastic cover under the dash to expose the blower motor. the blower motor resister is right next to the motor. Simply unplug the resister remove the two screws and replace. I did this and now my fan works on all speeds.
SOURCE: I have a 2001 Chevy
Replace the blower motor resistor. Remove the shroud below glove box, 2 screws and a snap-pop fitting. Be careful of the courtesy light. Remove the blower moter and disconnect the purple/black power connector to it - - you'll need this extra room to work with. 2 more screws, same size, 6.5mm on mine, 7or 8mm on some others, that holds the blower motor resistor in place. This replacement part is less than 40 bones at most parts store. Unplug, replace, re-install, test and you're on your way with about 2 hours of slow paced effort in your own driveway. Typical cost at a garage - up to $400, what a sham.
SOURCE: location of heater blower relay on '92 Accord
If the fuse is good,check to see if there is voltage to the blower motor,if there is,replace the blower motor.Sometimes,not always,if you bump the blower motor,it will start working,if this happens,then the blower motor is bad,if it does not,the fan switch could be bad,but the relay is usally near the blower motor.Testing it with a test light is the best way to test it,ground one end of the test light,the other end has a point on it.Use the piont of the test light to touch all the legs on the relay,with the key on,and the fan on high.The test light will light up,on almost all the legs,but it will also activate the relay when you touch the right leg of the relay,the relay needs to stay plugged up as you do this.If you can not access the legs of the relay,because of a skirt on the relay,push the point of the relay into the wire that you are testing,or into the plug,near the leg of the relay.The legs I am refuring to,are the prongs on the relay.If the relay clicks and turns the fan on,when you touch the right one,then the fan,and the relay are good,it will be the blower fan switch.Now if you already have high,blower fan,and the lower speeds are the problem,replace the blower resister,It is mounted right next to the blower motor,and has about 7 wires plugged into it.
SOURCE: trying to find location of wiper motor relay on a
if you can see your wiper motor, there is a black panel were the wires hook up to it, remove the three torx head screws unplug and pull out the wiper module. thats your relay and they are replaced a bunch, the've had a lot of problems with these modules.
This electrical switch, located in a fuse or breaker protected circuit, controls the rpm of the blower motor through a series of control relays and a rheostat. Sometimes the A/C compressor clutch is energized by this switch.
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