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My '93 Safari does the same thing. I probably need to replace the blower motor but I found that, with the engine running and with the fan switched to high, if I open the hood and tap on the blower motor housing with a piece of wood, the motor starts and runs for a period of time. After repeating this a few times when the motor doesn't run, it seems to work fine for weeks before quitting again. Hope that helps.

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Q: The blower on your GMC Safari worked on and off and now dose not work at all?
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