Where are the spark plugs on a 2004 crown victoria police interceptor

SOURCE: 2004 and 2001, are parts interchangeable?

Yes they are as long as the Motors are Similar.

SOURCE: 2004 Police Interceptor, does it have SOHC or DOHC?

it is DOHC

SOURCE: 2004 Ford Crown Victoria, how many labor hours for?

Depends on whether or not you are going with Brand new or are Going to Machine the Old ones. Which way you goin????

SOURCE: 2004 Interceptor, will replacing the heads fix?

Make sure to Replace the Rings also and they will be Fine unless the Heads are Warped.

SOURCE: 2004 crown victoria police interceptor wild driven the car the a/c vents switch from front to the top

you have a leak in the vaccum line to the hvac system