1989 GMC Sierra "bypass fan speed switch" Questions

Fan speed switch only works on #5 I have a strange problem with the climate control in my GMC 1500. The fan control does not work for speeds 1-4 but works fine on the highest setting of 5. The AC ...

fan will work on high and speed setting 4. The likely cause for this is the speed 3 resistor or circuit has burned out. Speed 4 still works because it doesn't use the lower speeds resistors to control

...bypass the resistor pack and connect the motor directly to the fused 12v supply then the fan should run at maximum speed. If so, it's the resistor pack that's blown: a very common fault on a huge ...

...bypass the resistor pack since there is no need of resistor at full speed, so if the fan stop completely, there is a good chance the fan is blown if it is not working at full speed. Take a voltmeter ...

...or unit or what ??? You have a bad fan resistor. Resistor regulates how much voltage goes to the fan. When it brakes it doesn't regulate and full voltage is bypassed to fan. 12V is full speed on

...fan switch works on 1 2 3 but shuts off on 4is there a way to bypass the switch? Your problem is the reverse of the typical one; no slow speeds, only maximum speed available. Without a diagram of the ...

fan speed dose not work I've changed fan itself the resitor I now have it bypassed with toggle switch temporary any ideas My first guess would be the control module, if the fan has no power and the 30

Fan high speed is from bypassing all the resistors completely. So you have something wired wrong. When switch is on high, check which lead gets power with a test light, and make sure that bypasses all

...FAN SPEED PROBLEMS.DONT BYPASS OR OVERRIDE FANS.IF SO.YOU ARE GOING TO HAVE PCM AND CLIMATE CONTROL PROBLEMS.IF YOU HAVE ALREADY CHECK 3 FAN RELAYS.THEY ARE GOOD LET THE CADILLAC DEALERSHIP CHECK IT ...

...fan speed rather roughly could clean the contacts in the switch and help cure the problem if the switch is at fault. If the fan motor slows down regardless of speed setting, it is likely the motor ...