Voltage meter fluctuates up and down. New battery and rebuilt alt. lights dim when the meter dips. Its 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: do the back windows roll down on crown victoria

Most "Police" vehicles have the Rear Door Window electronics and/or mechanisms disconnected to prevent the escape of persons under arrest/in custody.
Take the Rear Door Panels off to check the connections.

Let me know if this helped..

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