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The vacuum tree is located at the back of the upper intake manifold on the MPFI engines. Edited answer: the vacuum tree is located (looking from the front of the motor) on the right rear side (driver's side) of the upper intake maniforld. You can locate the disconnected hose and reinsert it to one of the vaccum branches. Do this with a cold engine, a flashlight. Reach your hand through the wires, locate the hose and reconnect. For an older aerostar, there is probably oil on the vaccum tree, you may want to clean it with a non-flammable cleaner fluid/cloth.

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โˆ™ 2009-02-20 15:27:55
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Q: Where do you re-attach a vacuum hose on a 91 Ford Aerostar?
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