1998 BUICK LESABRE LIMITED WILL A MANUAL BLOWER

Doesn't have resistor , has blower motor control module .
Blower Control Module
Under the right side of the instrument panel, right of the blower motor
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Here's a link to a new resistor,it's mounted next to the blower motor,easy to replace,remove electrical connector,then 2 screws. http://www.autozone.com/cooling-heating-and-climate-control/blower-motor-resistor/duralast-blower-motor-resistor/buick/lesabre/1999/6-cylinders-k-3-8l-fi-ohv/200919_0_0_5396 Here's a link to your blower motor. Repair Guides Heating And Air Conditioning Blower Motor AutoZone com

Its faulty blower motor resistor. The low and medium speed on blower motor is controlled by resistor and its actual speed is high. So because resistor is not working, blower motors actual speed which is high is working.

It can be faulty blower motor or faulty blower motor resistor. Get the blower motor inspected. If it's faulty it has to be replaced.

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For blower motor testing and replacing, check the link below: ----

Blower motor Testing/replacing for all vehicles?

http://repairhelpcenter.blogspot.in/2012/02/blower-motor-replacing-for-all-vehicles.html

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These will help.

Thanks.

Check connections on switch for loose or burnt wires.Sounds like it might a bad switch or blower motor resistor.Hopefuly its the blower motor resistor its cheap the heater control switch on the other hand is very exspensive. Make sure you check the wire connector for melted connection on the blower motor resistor this could be the culprit.www.rockauto.com has a new wire connector and resistor for alot cheaper than you can get it from anybody else.Hope this helps!!

REMOVE HEATER BLOWER MOTOR HOT WIRE BLOWER MOTOR IT.IF IT WORKS.YOUR AC AND HEATER CONTROL SWITCH IS FAULTY.CHECK HVAC FUSES AND CHECK BLOWER MOTOR RELAY.IF BLOWER MOTOR DONT WORK WHEN HOT WIRE REPLACE IT.IF ALL CHECK OUT GOOD.HAVE DEALERSHIP DO A DIAGNOSTIC TEST ON YOUR CLIMATE CONTROL SYSTEM.

As you are looking into the engine compartment from the front it is to the left of the blower motor.
Here is a diagram to help you find it.

The blower resistor is part of the blower module which is located on top of the blowercase under the hood. Just by the blower motor , hope you find it.. It will also have 2 plugs on it..

the hvac selector switch in the dash may be the problem.You need to remove the switch and look at the connector on the back of switch,see if there are any burnt wires at the connector or switch.It's all electronic and the switches have been known to burn out on this and other model.

There are actually two possibilities for your issue. First is the blower motor resistor as you stated as a possibility. The blower motor resistor is usually located inside the blower motor housing unless the blower motor is mounted horizontally and is accessible from the engine bay (which I do not believe is the case in your Buick) in which case the blower motor resistor is going to be located in close proximity to the motor.

The other possibility is that the ignition switch is going bad. Now, this may seem strange at first, but GM ran much of the power for the accessories through the ignition switch and as a result, carbon builds up on the contacts and starts to affect the operation of the accessories. However, I dont think this is the case in your issue as that is normally accompanied by issues with other accessories like the radio and such.

I think it is more likely that the blower motor resistor is bad in your case. I believe your blower motor is located on the passenger side, against the firewall close to the center console. If you contort yourself in a way where you can look at the bottom of the blower motor housing you may see a connector on the bottom, or a small access panel. If so, that is likely the blower motor resistor.

The resistor is located on the blower housing on the firewall under the hood under the relay center boxes.