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The Volvo's use an ignition switch that feeds power directly to the accessories. Probably wear is causing an intermittent connection. We own 3 Volvo cars right now, and all 3 have had the same issue. For the 740's, it's a pain in the butt to replace. The 850 is a 15 minute job. Pull the black plastic bezel from under the steering wheel, 4 Torx T-15 screws, and switch is right there. Switch is $60-$75 depending where you find it. FCPGroton or IPD are your best bet. Good Luck- PRM

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Q: Why does heater blower work intermittently on 1994 Volvo 850 Turbo?
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