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Volvo blower speed is controlled by an NPN power transistor -N3055- which most people for some reason call a resistor. Its under the dash on the passenger' side. It gets very hot and normally packs due to that, you'll find it on a heat sink somewhere there, very easy to test, cost less than a dollar to replace, you'd be surprised!

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Q: The blower on your 2001 Volvo s40 does not work you have checked the fuse and it looks fine What could the problem be?
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