most blower resistors are used to conrol blower fan speed some are mechanical useing different sizes of coiled wire to cut down power which slows fan speed down a open resistor is a open circuit or broken circuit most time you only have high speed and no lower pseeds when resistor blows also now ther are electronic resistors that limit power to fan but they use electronic parts to perform the same effect as theyre early models. open resistor is a open short or breake in the electricity flow. its in the blower box to keep it from overheating resistance equals heat.. g
shaking the blower resister
Most likely the resister is burnt out. When you use less than full blower, the blower speed switch shunts the 12v power though a resister to drop the voltage to the blower motor, slowing the blower speed. When the multi-speed resister is burnt out, it is, 'open circuited'. So no electricity can pass though to the blower. When the blower switch is on 'full', the resister is bypassed, allowing full power to the fan motor for maximum speed. It should be located under that dashboard in most vehicles. Just trace the wires from the switch to the resister. Warning: a working resister can get very hot when power is going though it.
When you beat the blower motor, you are probably shaking the blower resister. The resister is what controls the blower speeds and is probably bad or loose.
The heater blower resister is under the dash on the passenger side. It is inserted into the side of the blower motor case.
Behind the glove box.
location of resister for blower motor on 1997 s 10 blazer
Remove the HVAC rear module auxiliary assembly.Disconnect the electrical connectors from the rear blower resister auxiliary.Remove the air outlet duct from the rear blower motor controller auxiliary.Remove the screws from the blower motor rear resister auxiliary.Remove the rear blower motor resister auxiliary.Replace the resister and install new thermal gasket.................
Passenger side floor board. Open passenger door, look up and foward towards firewall. There are 2 screws holding it in the blower box. It has a 1X3 5 pin connector.
Open hood, locate resister on passenger side of firewall, unplug the electrical connection, remove the three screws and remove resister.
It's close to the blower motor.
The blower resister could be bad, or the blower switch could be failing. Check the resister first, it is commonly mounted at the rear of the blower housing under the hood.
You will most likely have a bad blower resister..............