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Firing Order 1-3-7-2-6-5-4-8
Bank 1 on the right
Bank 2 on the left
Cylinder #1 on the right
Cylinder #8 on the left last one ,which is the driver side
Check for vacum at the heater control ports behind the dash and for vacum leaks. For safty reasons the
system is designed to go to defrost mode in case you lose vacum to the system. Hope this helps.
Check the operation of the temperature control actuator. It is located on the top of the heater case. If it doesn't move when adjusting the temp. the actuator is probably bad. It is no an easy task to replace. The case hase to be lowered to get to it.
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.
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