Heated seats are usually an option reserved for expensive luxury cars, but i decided to add the feature to my 1998 Crown Victoria Police Interceptor using an aftermarket kit.

Installation sounds simple in theory: remove the seat covers, place the heater pads in between the seats foam and the seat cover, and reassemble.

Airbag Warning:

2000 and earlier crown victorias use a single stage airbag system that deploys both passengers side and drivers side airbags regardless of whether the seats have someone sitting in them at the time of impact. But use caution if retrofiting this unit onto the passengers side seat of a 2001 or later crown victorias that has a seat occupancy sensor incorporated into the seat. If the passengers side seat occupacy sensor is damaged, the passengers side airbag may not properly deploy in a collision. The airbag control circuitry automatically assumes that the drivers seat is occupied, so a sensor to determine whether the seat has someone sitting in it or not is not needed on the drivers side of 2001 and later crown victorias.

Also, starting in the 2003 model year, crown victorias were avaliable with side airbags as an option. Use appropriate precautions if working around live airbags.

Acquiring the Parts:

The universal seat heater kit used for the installation documented in this article is from:

Rostra Precision Controls
http://www.rostra.com
(800)782-3379
Part #: 250-1550

The Parts:

Here's the parts that need to be installed for the project. In the upper left are the two heating pad elements. A little bit below the pads is the control switch. The box towards the bottom is the temperature regulator for the heating elements. Each heating element has a thermostat incorporated into it, and the control unit will cycle the elements on and off as needed to maintain a steady temperature of around 140 degrees fahrenheit.





Tools:

1/2" drive metric socket set and ratchet
metric wrenches
wire cutters
screwdrivers
pliers

Note: the front seats in 1998 crown vic police interceptors do not use "hog rings". they instead used a combination of velcro and "j-clips" to hold the upholstery to the seat.

Removing the seat:

Are 3 bolts and 1 nut that retain the driver's side front seat to the vehicle's floor floor pan. It is not uncommon to snap the heads off the front two bolts when attempting to remove them. If the heads do break off, you'll need an electric drill, a set of taps and some oversized bolts and washers to fix the problem.

After all the fasteners are removed that hold the seat in the vehicle, unplug the electrical connector that comes out of the floor covering and connects to the seat. Now carefully maneuver the seat out of the front drivers door taking precautions not to damage the vehicles paint or interior door panel.



Disassembling the seat:

First remove the recliner handle from the seat, it is retained in the same manner as window crank handles. Slide the c-clip off the handle, the handle will then slide off the recliner mechanism splines.



Flip the seat over so that the seat tracks and "j-clips" are accessible.



Unclip the "j-clip" that hold the upholstery to the seat frame on the side with the recliner lever. Remove the two bolts which hold the reclining mechanism to the bottom seat tracks. Now unbolt the seat tracks from the seat frame.



Remove the seat tracks from the seat.





Slide the remaining "j-clips" off the seat frame.

Bottom seat frame will easily seperate from the seat foam and upholstery.





Carefully slide the reclining mechanism out from the bottom portion of the seat.





The question is sometimes asked whether the front seat covers are interchangeable from the passengers side to the drivers side.

The driver & passenger seatback covers are symetrical on both sides and have identical dimensions. During the 1998 model year, the only difference between the two is that the drivers has a cloth side and the passengers a vinyl side. Starting mid-way into the 1999 model year, police interceptors got cloth sides on both the drivers and passengers seat too.

But the bottom seat cover is not symetrical on both sides, and is not interchangeable between the passengers and drivers side. Notice the hole in the upper right and the difference in shape between the two sides?



Installing the heating pads:

Bottom portion of the seat has plenty of physical space to fit the heating pad.



Top portion of the seat is a little bit more difficult to fit the heating pad in. At a quick glance from the outside, the heating pad will appear to fit without a problem.



But there is a complication, the seat upholstery is held to the seat back foam using velcro at the locations highlighted below in red



Placing the heating element in between the velcro and seat cover will prevent the seat upholstery from laying properly and also cause crinkling sounds whenever someone sits in the seat. The solution to stop the crinkling sound appears to be to remove three elements from the heating pad so that it will fit in between the bottom of the seat and first red line. The blue item with the tan stripes to the left in the picture below is the portion of the heating element that was removed prior to installation.

Note that the base model civilian crown vics use the same velcro pattern to attach the seat upholstery to the underlying foam as police interceptors do. But some civilian crown vic lx's use a different pattern of velcro for attaching the seat upholstery to the seat foam. Instead of the half circle and straight line pictured above, the upholstery is attached in a rectangular pattern. Seat heater installation in such seats would be considerably easier for the top portion of the seat because the entire heating element pad could be placed in between the upholstery and the cover without cutting or other modification.



Now that both heating pads are installed, it's time to reassemble the seat. If all goes well, your seat will be nearly identical to when you started.



Using the cable ties supplied in the kit, secure the wires in place that connect the heating elements to the control module. Make sure to provide some sort of strain relief for the top heating element to prevent excessive force on the wire from detaching the wire from the heating pad when the seatback is reclined backwards. Since my seat had manual adjustment tracks, the location where the power seat motors would go was unoccupied and made a good location to mount the seat heater control module.

If you'd like to install a new bottom cushion while you've got the seat apart, below are the ford service part numbers for police bucket seats:

XW7Z-5460001-AA	Front Drivers Seat Repair Kit (Includes cushion, support grid, and springs) 1998-2002	$47.65
XW7Z-54632A23-AA	Front Drivers Seat Cushion 1998-2002	$68.75
XW7Z-54632A22-AA	Front Passengers Seat Cushion 1998-2002	$67.08

Note that if your vehicle your vehicle was ever in active police use, it is very likely that the bottom seat cushion will be collapsed to some extent and installing a new seat cushion would provide a noticeable improvement in driver comfort. Installing a new bottom seat pad will also correct the "leaning" seat issue because new service parts have additional foam added to the inboard side of the bolster.

Wiring:

The control module has three wires to attach to the vehicle, a ground, hot with ignition on, hot in accessory position.

The ground can be attached to the thick guage black wire on the underside of the seat that normally provides a ground path for the power seat & lumbar support motors.

The black with small white stripe wire on the underside of the seat is always hot and has a 20amp fuse in it. The heating elements draw less than 7 amps, so this wire could be used as the accessory power wire. But it might be a better option to use a lead that was only hot when the key is in the accessory position.

The hot with ignition wire is a sense wire and draws only a few milliamps, so any wire that is hot with the key in the "run" position can be used. Take precautions not to choose a wire that is also hot with the key in the "accessory" position as the heated seats can draw close to 100 watts and will quickly drain the battery if the seat switch is turned on but the engine is not running.

If you want to test the seat before permanetly wiring it into the vehicle, attach the black lead directly to the vehicles battery. Then twist the ignition and accessory wires together and connect them to the positive terminal of the battery. Start the vehicle's engine and turn the heated seat switch to the high position, within a couple minutes both heating pads should be warm to the touch.

Other thoughts and issues:

The bucket seat covers in police interceptors are constructed physically thick upholstery to extend life under severe duty. The seat heater works acceptably with the top portion of the seat. But the bottom portion of the seat has a cover that is very thick compared to the back of the seat. Cover is so thick in fact that barely any heat is transmitted through it.

A few people have asked about air conditioned seats. The lincoln navigator starting in the 2000 model year had this feature avaliable as an option, in the winter the seats are heated, in the summer they are cooled. The setup consists of a control module, a couple thermoelectric devices that work on the "peltier effect", duct work, fans to move air around and special seat upholstery. For more details on this subject, visit the manufacturer's site at http://www.amerigon.com and follow the links to the section on the "climate controlled seat system" (CCS).




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