Could be the ignition switch - on some cars the high blower position is directly wired to motor - the other speeds go thru the ignition switch and if there is a problem, you have no operation unless you put it on full blast and bypass switch.
You may have a fuse/relay for the lower speeds - check for that also.
SOURCE: Heater Control Switch Only Works on High
Your problem is probably a part called the heater resistor block or board. When this part burns out you will only have high speed on the fan. On my 1999 voyager it is located on the firewall and it snaps in a hole in the firewall. This is under the hood behind the alternator.
Mine had a multi pin black plug plugged into it. Unplug the plug and
you should be able to pull the block out insert new block and plug plug back in and it should come to life.
SOURCE: Mercury Cougar heater blower only works on high.
remove the trim panel below the glove box and you will see the blower motor,just to the left of it you will see a 4 wire connector plugged into the case. This is the blower motor resistor,this is what you need to replace.
SOURCE: heater blower switch only works on high
I'd replace blower resistor, usually found under hood on firewall on passenger side, or on duct work, inside under dash on passenger side,close to blower motor.
SOURCE: 1996 Jeep Grand Cherokee Laredo AC blower wont work on high
I'd check the relay and the resistor ...don't have a location for yours but the resistor is always installed into the heater box so it stays cool. you can usually follow the wiring back to the relay as it's generally nearby. Resistor looks like a piece of circuit board material with several wires connected to it with two screws holding it to the heater box so it sits flush except for the wires. It has several coils inside...any that are broken have failed.
SOURCE: renault megan coupe 98 electrical problem
its fauly relays. that cant be changed as they are soldered
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