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Labor Day Putting down your wrenches or time for
MORE wrenching? 
Plenty of places to share. | | Click on image for the lowdown. 
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| | | Forums66 Topics128,004 Posts1,055,246 Members48,418 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Jun 2010 Posts: 170 'Bolter | | 'Bolter Joined: Jun 2010 Posts: 170 | I've had vacuum wipers on cars in the past, they had 1 push pull control for the on/off and speed. On my 46 pu, the push pull knob seems to control on/off and speed just as I've seen on other vehicles - but I'm not getting what the 2nd twist turn knob is for. I've messed with it, turning in and out, but it doesn't seem to have an effect on the wiper operation. (The unit has been rebuilt). I've tried the owner's manual and shop manual, but no mention is made of what the 2 knob does. Dumb question, but it's bugging me. | | | | | Joined: Feb 2000 Posts: 5,190 'Bolter | | 'Bolter Joined: Feb 2000 Posts: 5,190 | The twist knob is speed control, it simply shuts down the vacuum supply just as a water valve shut off the flow of water. I have two of them and only one works, the other does likes yours, nothing!
Joe | | | | | Joined: Jun 2010 Posts: 170 'Bolter | | 'Bolter Joined: Jun 2010 Posts: 170 | Thanks much! I appreciate the feedback, I've only tried while parked, maybe it will make a difference while I'm driving along. I don't expect to be in the rain much, if at all - but just in case. BTW, Joe, your 37 is great looking. | | |
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