Question about 2002 Buick LeSabre

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2002 buick lesabre blower fan is intermittent

I disconnected plug from blower motor and checked voltage. center plug is hot & left side is ground which gives me battery voltage with car not running but no change in voltage when moving fan switch. There is a 3rd plug. How do I connect my voltmeter to see if I'm getting variable voltage thru the blower resistor?

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Hello there.

I would suggest you replace the blower motor speed control resistor 1st then the blower motor if the resistor doesn't fix the problem. Below are instructions to replace the resistor.

The blower motor resistor is located on the back of the blower motor housing under the dash on the passenger side. It can be difficult to get at, but it is doable. Be ready with the ibuprofen the next day for your sore back. Remove the cover panel from beneath the dash on the passenger side. Unplug the power 'ribbon' wires leading to the resitor. Unplug the wires that lead from the resitor to the blower motor housing. There are usually two, one black and one purple that share the same plug. Remove the short hose that leads from the blower motor housing to the ventilation system ducts. Remove the blower motor by removing the three hex screws that hold it in place. Remove the resistor by removing the three hex screws that hold it in place. The resistor is right against the firewall so two of the screws are very difficult to reach. A slender flexible socket extension will make the job easier. Attach the new resistor in place using the same hex screws. Only 1 or 2 of the original three are needed (the part is very light) if you do not feel like fighting with the ones next to the firewall. Reatach the blower motor and reconnect the hose. Plug the power cable wires back into the resitor and the wire from the resistor back into the blower motor.

Hope this helps.

PCGuy30

Posted on Mar 11, 2009

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It depends on where you trying to find the voltage from. You can measure it across the resistor if you need the voltage for the resistor, and you would have to just put the positive end on one side of the resistor and then put the negative end on the other side of the resistor.

Posted on Mar 11, 2009

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The relays for the blower are under the hood, near the top of the firewall on the passengers side. You will need to remove the plastic "fuse cover" to access them below the fuses. Replace them one at a time to see if this fixes the problem. If the blower is running intermetantly, then you may find you have to replace the blower motor (I needed to do this on my car $45). In order to do this you'll have to remove a bracket and several other lines in front of the blower motor to get enough clearance. If it works only at certain fan speeds then also check the blower resister located under the relays.

Posted on Mar 11, 2009

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Your problem is within the fan speed switch itself. you will have to replace the speed switch assembly.

Posted on Mar 11, 2009

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3rd plug would be hot and use the left side for ground.  But to my knowledge the resistor cuts down the power on the main wire.  Sounds like you have a bad blower motor resistor.

Posted on Mar 11, 2009

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1 Answer

The ventilation fan for heat/ac is not working. The fuses all seem the be ok. Any thing else to look for


Did you check the proper fuses for voltage? Some fuses are hot all the time, some go hot with the key on. Even if fuses are good, if no voltage the circuit is still dead. I guess your talking about the blower motor? Can you hear it running? I don't know if you auto hvac or manual hvac? I don't know if your talking about front or rear blower motor?
Get at the blower motor, if two wire connector, that should be voltage and ground. Turn on the hvac controls, check for voltage and ground at the blower motor connector. If good voltage and ground with no blower action, suspect the blower motor.

It is possible to use jumper wires from the battery for voltage and ground to blower motor connector, just for testing to see if blower motor will run, use an inline fuse, just in case.
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