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replacing the power antenna mast is a perfect shade-tree mechanic job. in fact, you will need to learn how to do it, because you will likely replace the antenna often.
fortunately, you probably only need to replace the mast and not the power drive. new masts are readily available for purchase online at around $12 online (plus shipping). google: power antenna mast volvo 745. you should purchase two.
you can also use google to find instructions for the r&r of the mast. in general, you must pop out the plastic access panel inside the car just below the antenna. power up the antenna and listen for the whirl of the motor. if you don't hear anything, you may need to troubleshoot a faulty power antenna motor. usually, though, the toothed nylon cord has snapped. remove one (or two) set screws at the top of the power motor to release the cord. pull the antenna out from outside the car. if it hangs up, turn on the power antenna and see if it will push out the remaining cord.
after you've gotten the old cord out, turn on the power antenna--the motor should run and will not turn off. feed the new mast cord down into the motor, turning it until the motor gear catches the teeth on the cord. when the motor has drawn up the entire mast cord, it will stop. reassemble all the whatnots and enjoy.
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