I have a 2001 Volvo C70 Conv. 2.4L and my mechanic says I need to replace the "final stage resistor" to fix the problem of no a/c blower at all. I get blinking orange lights on the climate control panel when I set the controls. No setting starts the blower. Is the "final Stage resistor" the same as the "blower motor resistor" and can I find a guide for changing it out?

Volvo Forum • 2000 v70 Blower Motor/Resistor Question - Matthews ...

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Jan 8, 2011 - 14 posts - ‎1 author I replaced my blower motor and resistor - with the help and ... On ECC the transistor power stage (referred to as resistor) will shut off blower if the ... the current to blower(voltage level to blower) is controlled by the ECC control unit. ... Hook the negative side of the car battery (or other 12 V source) to the fan. Volvo Forum • S40 fan speed erratic
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Sep 5, 2007 - Uploaded by volvoproject All how to replace blower motor in volvo s70 v70 c70 XC70 ....Awesome video....took 15 mins to install blower motor andresistor on my .... Most time was spent trying to remove theelectrical wires from around the blower properly (there ... I was suprised how much bigger the fan is irl than it looked in this vid!

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Most likely need a new blower motor resistor

remove Remove the glove box and rear trim panel to access blower motor, are u sure it is not the blower speed control that is the source of your problem? that is the most common failure
Here is a copy of the instruictions to replace that component if needed courtesy of Just Answer.com


I believe that the component the BMW tech was referring to is the blower final stage (like an electronically controlled blower resistor assembly). This is a very common failure item on this model, and causes the symptoms you describe.
BMW has a revised part number for this component, which lasts much longer than the original design. When you call the BMW dealer for the part, it is #(P/N 64 11 8 385 549).
The IHKA blower final stage resistor is located behind the right side footwell vent duct. Here is the replacement procedure:
(1) Remove the glove box and rear trim panel to access the area behind the duct.
(2) Remove the two attaching screws from the stepper motor bracket and carefully disconnect the flap rod from the stepper motor arm. Remove the stepper motor to access the final stage resistor. Note: Do NOT turn on the ignition switch while the steeper motor is removed from the case.
(3) Remove the connector from the final stage resistor and the two attaching screws. Remove the IHKA blower final stage resistor and replace it with the improved PN 64 11 8 385 549

you need a blower motor resistor

sounds like there is a wire grounding out

The blower is not the problem
The problem is a faulty final stage resitor located
on the passenger side under the dash.
Very common - easy to replace.

the final stage resistor on all BMW blower motors controls everything (power and grond ) 99% of blower motor issues is the resistor. not to hard to install either.

i changed mine without the filter because i could not find one. i had no problem. the drain was in the bottom.