2004 crown vic. only 63K miles on her. AC/heat fan was sporadically working, now its done. AC was nice and cold, working fine. Is the fan a hard replacement if I were to find one at a parts yard?

Hi Karen,I doubt it's your blower motor since it was sporadically working,they work or they don't,a blower motor resistor is what controls the motor,they are easy to replace,they are screwed in next to the blower motor,just remove electrical connector ,then use a phillip head screw driver,remove both screws and pull out,here's a link of a new one,it's best to take old one to part store and match up so you get the right one,get this part new,no junk yard ones,k. Blower Motor Resistor at AutoZone com Best Blower Motor Resistor Parts for...

• Blower motor resistors divert power or ground through resistors to control blower motor speed
• When not replaced, blower will either not function or will not run at all speeds.

Try to check the power and ground on the blower fan. If you missing the ground on the blower fan connector than most likely it is the blower fan resistor (controller), it is located under the hood close to back firewall behind left cylinder head.