Very straight-forward procedure.
if it is a dohc engine then you may have to remove the intake manifold
The Mercury Sable and the Ford Taurus will have DOC in printed on the engine if they are dual overhead cam engines. The symbol should be on the top of the engine.
in the front and back of the engine directly above the exaust manifold
The Villager has an upper and lower intake manifold. It is at the top of the engine with the throttle body attached to it.
remove engine....move...replace engine
You don't, you replace or rebuild the engine.
where is the speed control senor located on a 2002 ford taurus
no.
No, not for the hose but, I have seen the metal bypass tube that the hose connects to, rust out and cause a coolant leak out the back of the engine. The intake manifold would have to be removed to replace that metal tube.
Could be sucking air into intake.
The 1997 Mercury Cougar 4.6 liter engine intake manifold torque sequence should begin at each end of the manifold. Keep moving towards the center and alternating from and to end.
Nissan isn't going to stock any parts for this, try Rockauto.com or eBay.