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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Vacuum lines question

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Old Jan 12, 2014 | 04:15 PM
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what purpose do these broke off red and white lines serve? It's on a 1996 f250 351 I also found this which apparently had a red line that ran to it as well but it's broke off as well
 
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Old Jan 12, 2014 | 04:25 PM
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Top pic is the vacuum resovoir.. you definitely want those hooked up. Bottom pic I'm not sure about, what is the other end attached to?
 
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Old Jan 12, 2014 | 04:37 PM
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this is what the bottom pic is connected too, the red vacuum line.
 
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Old Jan 12, 2014 | 04:38 PM
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Originally Posted by Conanski
Top pic is the vacuum resovoir.. you definitely want those hooked up. Bottom pic I'm not sure about, what is the other end attached to?
What functions do these control? The truck seems to run fine without them hooked up.
 
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Old Jan 12, 2014 | 07:05 PM
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The vacuum resovoir buffers the HVAC controls and several engine actuators, a leak in the system will sometime show as an unstable idle or heater controls that change all on their own.
 
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