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Is there such a thing

Discussion in 'The Garage' started by jamber2541, Dec 8, 2006.

  1. jamber2541

    jamber2541 1/2 ton status

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    Is there such a thing as a vacuum leak inside the cab affecting the way the engine is running. My friend swears that he can hear a vacuum leak inside his cab and says his engine has ran like crap ever since it started ??
     
  2. dyeager535

    dyeager535 1 ton status Premium Member

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    I can't recall the routing, but there is a vacuum line on the brake switch, on cruise control equipped trucks.
     
  3. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    Yes, it's possible. All the heater controls as well as the diverter doors on an AC-equipped truck are vacuum-operated.
     
  4. NJBLZ

    NJBLZ 1/2 ton status

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    my trucks have heat only, which is controled by cables, but trucks with air conditioning have vacuum hoses and cables running out of the back of the control unit.


    on ac trucks the hot-cold setting is cable operated

    when you use the off-max-norm-bi lev-vent-heater-def it sends a vacuum signal through little colored plastic vacuum lines.


    they all tee off from a regular black vacuum line from the engine, but i dont know exactly were it is. you can plug that one and see if it changes anything. i had a 78 monte carlo that they dry rotted and desintegrated on.
     
  5. mdm365

    mdm365 1/2 ton status

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    also if it has a power brake booster it could be leaking at the firewall inside the truck.To test this all you have to do is pinch the 3/8 hose to the booster. mike
     
  6. JEBSR

    JEBSR 1/2 ton status

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    If its loud enough to hear easily and make that much differance in how the vehicle runs, it probably is the booster.
     

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