I just picked up a 240D that has a blower motor that works intermittently. It will run for a few minutes and then go out, maybe come back on ten minutes later. Setting the fan at medium has had the most success. Heater core is fine. AC is non-op. Could there be a loose connection somewhere? If I have to replace the blower motor, where might I find a good manual or DVD demonstrating the procedure? Thanks,

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'81 300SD