Try a web site called www.autozone.com for a diagram and check the fuse box
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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 Heat control will not switch
their is a little motor on your duct work that moves a door open and closed to switch from heat to cool,it is called actuator motor.watch it and have someone to switch it from cool to heat to Se if the motor is turning.
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: 99 buick lesabre, battery ok, turn key to start, nothing
The security system (VATS/PassKey) is faulty. You can find a great write-up here: http://newrockies.ca , it was the only thing that saved my Park Avenue.
SOURCE: how to install a new top and bottom hvac heater hose fitting
The hoses are moved by turning them a few degree's, then pulling them off. See diagram below.
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