The service and repair manual with diagram will provide you step by step help to locate and fix the problem easily and you will get the manual from the given link Home Toolsnyou
SOURCE: front ac blows out defrost
the vacuum line in broken, check for same, start fromthe engine compartment, check to make sure the a/c doors are not jammed. check all fuse and relays
SOURCE: Hot air blows but cools down in 15-20 seconds.
You likely have a restriction in the heater coolant hose circuit - perhaps a coolant control valve not fully opening, or a kinked hose.
Insufficient coolant volume is flowing to keep the heater core hot.
Try back flushing the heater core system with a garden hose to check flow.
SOURCE: front ac is blowing cold
More than likely this is the rear orifice tube(or rear metering block) same concept.This invloves evacuating the ac and removing the orifice tube and repl;acing it.This is just normal maint that is accustomed to this vehicle.Please get back to me with any more questions...thanks!!!
SOURCE: 2000 lincoln LS AC blowing hot air i've replaced t...
You need a scanner to diagnose,not a code reader.
The DATC Module ( Dual Automatic Temperature Control Module) is a possible
Callout
Component Name
1
Push-pin Fasteners (Qty: 3)
2
Insulator/Closeout Panel - Left
Procedure
Disconnect the electrical connectors.
Caution: In order to avoid actuator damage, DO NOT apply power to the actuator when it is not installed in the HVAC module.
Preliminary Procedure
Remove the instrument panel insulator - left side. Refer to Instrument Panel Insulator Panel Replacement - Left Side.
1
Left Temperature Actuator Screw (Qty: 3)
Caution: Refer to Fastener Caution in the Preface section.
Tighten
2 N?·m (18 lb in)
2
Left Temperature Actuator
Procedure
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