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If you are referring to the blower motor resistor, it is located behind the glove box and in the heater case.
probably the blower motor resistor
resistor usually located by blower motor.blower only works on low or high,then replace resistor .do not replace hvac unit in dash waste of time and money
take it to a shop and have them do it If it's the same as a pickup, take out the glove box and the resistor should be on top of the heater box. Not much too it.
Replace shoes brake 2003 Chevy
Blower motor resistor defective
to the left of the blower motor. It's on the left side of the engine compartment
If yourtalking about the heater blower, I believe they are hidden behind the glove box inner liner.
Defective blower motor Resistor Pack. Replace it.
Replace the blower motor resistor.
The heater resistor on a 94 Astro is located on the top of the heater box under the hood, it has a four or five wire plug on it and two 6mm screws hold it in a hole in the heater blower box.
try replaceing the switch that controls the low to high for heater It's gonna be the blower motor resistor (near the blower motor).