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does it have a digital control panel? As this uses an electronic blower speed controller located at the engine compartment (rear engine block) fix on ac phlenum try to shake the connector or wire while the system is on.
The blower motor might be bad,turn it on,high blower,and bump the blower motor body with the palm of your hand,if it starts to run,or tries to run,then replace the blower motor.
those control units in the crown vics **** out all of the time. they're not cheap from the dealer, try auto parts stores for aftermarket or junk yards.
one trick we did with cabs was to pull the unit out and splice the black and blue vacuum lines together. that's great for summer, but you have only vent then.
replace the blower motor controller. ford part # 19e624.call your local ford parts store to get it. I am a ford technition and this is a common problem but the new part has been revised so it will last a lot longer. 9 times out of 10 this fixes the problem and a new EATC is not needed.
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