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Disconnect the battery from car terminals, wait for 10 minutes, and reconnect back the battery, in order to reset the electronic control module. If this procedure will not help you need to access the electronic control module using suitable diagnostic equipment connected to the data link connector of the car, in order to pull out all DTC's memored. DTC = Diagnostic Trouble Code. Then you will bu full informed about the root cause of the problem, and you will be able to repair & replace bad pieces and reset the electronic control module.
Since there is NO sticker under the hood of this 2003 Buick LeSabre and it is not in the owner's manual, a Google search revealed that it is the same as at http://www.fixya.com/cars/t3438653-change_serpentine_belt_1998_buick
Moe, I think you hi blower relay is bad. With this I mean the contacts in the relay are welded shut and you should replace the relay if the blower is on high all the time. Do this by removing the black plastic cover right behind the engine and removing the relay all the way to the drivers side of the relay bank. you will have to insert a small screwdriver under the relay and bend the little tang that holds the relay in place. then slide the relay out towards you and remove the green lock tab and unplug the relay from the wiring harness. if the blower finally stops then just insert a new relay in its place and reassemble in the reverse order. Good luck.
Unscrew the ignition coil(s) from on top of the module...(leave plug wires attached)....and set aside noting coil position on module....unplug module and replace with a known working module.If there is grease under old module...transfer it to new module.Replace coil(s) and start her up. TIP. While you are there,why not also change the crank sensor (if it not new).....it is THE trouble maker on these engines.
you should be hable to get some free repair tips at autozone.com, or buy it, but i will recomend you to replace the crankshaft sensor, because the crank sensor and the ignition module is what trigers the coils, i hope and i been help full and i will apreciate the ranking to me.