I have two 2001 crown victorias with the 4.6 cars are identical. the first one came in with the air conditioner not working the ac compressor was not getting fire to come on the pressure switch was not throwing fire to turn the compressor on so I jumped the switch with a hot wire and it come on an got cold until I unplugged it so I checked all fuses and relays replaced them an nothing was different so I tried a different headuit from the other car and it blew a fuse and still wouldn't work so I sent both headunits off to be rebuilt and tested 500$ later and neither one will turn the compressor on no codes present in the screen or with the scanner. it has the eatc unit not the manuel

SOURCE: a fuse diagram for a 1998 ford crown victoria

http://www.fixya.com/cars/t816725-fuse_diagram_1998_ford_crown_victoria try this site

SOURCE: a fuse diagram for a 1998 ford crown victoria

Contact your local Ford dealer. I'm sure they will help you out. 

SOURCE: 1996 crown victoria has no heat

i think it is the heater control valve i think it is mounted on the firewall by the top close to the hood it will have two black 5/8 hoses attached to it check and make sure it still has the cable attached to it before you replace

good luck here is the (how to) for your car



The heater control valve (sometimes called the water flow valve)controls the flow of coolant into the heater core from the engine.
Heater control valves are operated in three basic ways: by cable,thermostat, or vacuum. Cable-operated valves are controlled directlyfrom the heater control lever on the dashboard.
Cable-operated heater valve used to control the flow of water or coolant through the heater core.Thermostatically controlled valves feature a liquid-filled capillarytube located in the discharge air stream off the heater core thatsenses air temperature and modulates the flow of water to maintain aconstant temperature regardless of engine speed or temperature. Mostheater valves utilized on today's car are vacuum operated. These valvesare normally located in the heater hose line or mounted directly in theengine block.
To replace a heater control valve:

• Refer to your vehicle's service manual to locate the valve.
• Drain or lower the fluid level in the cooling system.
• Unclamp, unbolt and unplug the valve.
• Reverse procedures to complete installation.

SOURCE: The compressor and fan don't come on when the air conditioner is turned on and hot air comes through the vents. However, when the relays are removed and a test wire is inserted into the relay port, th

Sounds like a bad heater control unit, or bad control module. You are bypassing the switch when you jump the relays, so usaully the switching mechanism is suspect.

SOURCE: 1998 Crown Victoria air conditioner

Fuse 9, 50A under hood, Fuse 5 15A Instrument panel. If they're ok, make sure the compressor clutch can be turned by hand (engine off, obviously). If not replace the compressor. Most common problem is the cycle switch. That should be the electrical connector on top of the accumulator. Just jump that by backprobing the connector on both sides with a pinand connect them, with the car on and a/c on if the compressor clutch engages, replace the switch. If it doesn't, try wiggling wire harness and watch it, if it engages, find a broken wire and repair it.