Is the vehicle having any cooling issues? I.E. overheating? you could have a air pocket and the system needs to be bleed or once vehicle warms up check upper and lower radiator hose to see if one is hot and one is cold they both should be hot if u have proper circulation. did you ever have heat? when did this start do you have any check engine lights
SOURCE: 2000 BUICK LESABRE BLOWER MOTOR
The blower motor should be two wires. Backprobe and find out which is power and which is ground and bench test it. You could have a bad blower but it sounds more like a defective speed resister.
SOURCE: 2001 buick lesabre. my heater and a/c blower is not working
I believed the a/c blower is a relay activated. So no fuse getting blown to make it to go bad. Try to locate such relay (the ID label is found inside the relay cover assembly). Swap it with an identical one before making a trip to auto part store.
SOURCE: abs & traction light on 1997 buick lesabre
This is a fairly common problem, Gm has actually issued a service bulletin regarding this repair. The problem probably originates from one of your wheel speed sensors that is mounted inside one of your front wheel bearings. To be sure, you need to have the car scanned to find out which one and then you have to replace the whole bearing assembly because the sensor is integral to the bearing. The bearing is not hard to do but you will need some professional tools if you want to do it yourself. At a shop it should cost between 3 and 400 dollars complete.
SOURCE: where is the blower motor relay located on a 1997
There are 2 relays for the blower. The low blower relay and the high blower relay. They are both located
under the hood in the center of the firewall.
The low will have 4 wires from it, one lt. blue and 3 brown. The high will have 5 wires 1 purple(to blower mtr.) 1 black 1 dk blue 1 red and 1 orange.
Also, the blower resistor is in the same area if needed. Hope this helps.
SOURCE: 1997 buick lesabre HEATER PROBLEMS The fan
This could be several things. First I would check that the thermostat is not stuck open. This will condition will make the car run cold when it is cold outside.
If this is not the case........and I'm assuming you've already checked that the antifreeze is full, make sure that the heater valve is working. If it is frozen in place then it won't move and won't allow the warm water to circulate through the heater core.
I'm basing my answers on a standard Lesabre. Yours may not have the standard climate control.
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