This can be done us small mirror. Open and pull down glove box. There is a circuit on just above controller. Remove with 10 mm socket use small tools it's tight in there. Once this is out of the way take mirror and locate rear bolt at back of box, bolts on mine were 7/16 x take you time go to junk and practice I do it all the time
SOURCE: Re: Location of the radiator drain plug on a 1998 Lesabre
its in the lower right or left hand corner of radiator.
refer to this links diagram for more help.
http://www.autozone.com/addVehicleId,2380201/initialAction,repairGuide/shopping/repairGuide.htm?pageId=0900c152800b1cd7
SOURCE: 1994 buick lesabre heater core removal
The heater core is located under the dash, in the center. The container holding the core looks like a black plastic box. Remove the ash tray for easier access. You may have to also remove some other covers under the dash. You must first drain the radiator then you have to disconnect the hoses. There are two hoses connected to nipples of the heater core that go thru the center of the firewall. Remove the screws that hold on the cover to the heater core. Then you should be able to get the old one out. There might be a couple of other minor steps but I'm sure you can figure them out. For re-installation just go in reverse order to put it all back together.
SOURCE: 2000 Buick LeSabre heater only blows cold
the climate control thermostat is not opening the valve to let the warm coolant in
SOURCE: '91 Buick LeSabre heater blower motor
Are you sure the blower motor is defective? If the blower motor resistor pack is bad the blower will not work. Have you applied 12 volts directly to the blower motor to verify it is bad? I have not replaced a blower motor on your particular car but it is usually a labor intensive repair. Depending on where you have it repaired the cost could be as little as $150 and up. Hard to say without actually doing it. Replacing the Resistor Pack is a fairly easy repair, so hopefully that is your problem.
SOURCE: where is pcv valve 1998 buick lesabre
Remove the sight shield from the fuel rail. (it's the large plastic shield that dresses up the engine) As you stand in front of the car the alternator is located on rear left side. In front of it is an electrical connector to the MAP sensor. Remove it. Press the PCV valve cover down and rotate it 1/4 turn counterclockwise. It is actully on the intake manifold. Lift the cover, the upper O-ring and the spring from the housing. Remove the pcv valve and the lower O-ring from the intake manifold.
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