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  #1  
Old 10-20-2008, 03:02 PM
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Cool 79 450SL Blower

on my 79 450SL blower only works when I turn on A/C
anyone know fit? Jim

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Old 10-20-2008, 04:15 PM
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Don't know fit, but I would check for vacuum leaks under dash or possible even a switch-over valve failure.
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Old 10-21-2008, 09:53 AM
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The blower circuit is turned on in the heating mode by a vacuum switch. The condition of blower in AC only usually means you have a large enough vacuum leak, or leaks, that the vacuum switch can't operate to engage the blower motor. I suggest that you get a mighty vac, or the Harbor Freight equivalent, and start checking your vacuum pods and lines for the leak. I went through this with my '79 a few years ago, and ended up installing the digital upgrade advertised in this forum, as I found not only bad pods, but the mechanical nightmare that is the heater servo was totally shot. I am extremely happy with the digital upgrade! Spendy, but it works very well.

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