super easy to replace blower: pop off passenger kick panel, you'll see the housing for it. then either unscrew or unbolt three screws or bolts (8mm), unplug the wiring, and pull it down and out. on some models there's a heater core tube that's insulated, running right along the bottom of the blower motor, so you need to jimmy it out of there. also there was at least three kinds of blower motor for w123, be sure you get the right kind

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