The high pressure power steering hose will commonly leak fluid; it should be replaced.
Problems for specific Buick LeSabre years:
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Most reported Buick LeSabre problems
The steering rack may fail causing a loss of power steering fluid as a result the steering may become hard to turn.
The cam sensor interrupter (magnet) may become demagnetized and/or fall off of the camshaft gear causing the Check Engine Light (Service Engine Soon) light to illuminate. On higher mileage vehicles it would be advisable to replace the timing chain and gears if this problem were to occur as the timing cover must be removed to replace the interrupter.
I'll turn up the temp on the dual control to get heat, and/or the defroster to blow warmer air. All I get is cool air that makes for an uncomfortable ride and slower defrost. I did replace the blower motor in the summer, could this have caused the problem by not hooking something up correctly?
RUSTED BRAKE TUBES AT THE ABS UNIT.
REPLACE THE STEEL (Lines) TUBES (4) AND BLEED SYSTEM.
Fan has a loud roar as if there might be a blockage of air flow.
I have 3 windows that will not go up or down although the drivers side works fine
The anti-lock brake (ABS) accumulator may fail causing loss of power brake assist. (The brake pedal will become very hard.)
Door would not automatically unlock from the remote or when the master lock switch was opened and the window would not work.
Left Rear Door Module (Part #: 25654368) was bad -- Symptom: door would not automatically unlock and the window would not work.
troubleshooting: pried off the plastic cover behind the door handle (start at the hinge side), removed single screw and then starting at the bottom pulled off the door covering (It is held in with plastic snaps), found 12v going into the door module and deduced the module was the problem; found one on ebay motors ...