Vacuum diagram

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Northstar Engines and System Technical Discussion Discussion, Vacuum diagram in Cadillac Engine Discussion; I need an emission hose diagram for a 2003 cadillac deville....I'd appreciate the much needed help!...
  1. #1
    Misdealville's Avatar
    Misdealville is offline Cadillac Owners Member
    Automobile(s): 2003 Cadillac Deville
    Join Date
    Aug 2013
    I need an emission hose diagram for a 2003 cadillac deville....I'd appreciate the much needed help!

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  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS, 2014 Explorer XLT FWD
    Join Date
    Feb 2006
    MD Eastern Shore, Kent Island

    Re: Vacuum diagram

    Your EVAP solenoid is attached to the right (rear) side of the TB and the vacuum line, with green test port cap, snakes back under the car to the other parts shown. You crawl under there and trace it all out.

    Your PCV clean air line comes from the atmospheric side of the TB to the left (front) cam cover. The PCV dirty air line leaves the right (rear) cam cover and snakes around into the tunnel in the front (passenger end) of the intake manifold.

    The AIR vacuum comes from the TB to a solenoid at the right cam cover, where it then branches to AIR valves 1 and 2 - on top of the right cam cover and over next to the water pump cover/lower radiator hose.

    Pictures of all that in my albums - the Community tab ^^^, Albums, the red Seville.

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