Question about 1997 Buick LeSabre

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Heater fan not blowing..fan works with direct power..and ac fuses test o.k.....is this an electrical control problem?

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The fan on this Buick is operated throught the blower control module and a high blower relay . The module is in the heater case about six inches from the blower motor. The relay is one of the relays that is just under the motor.

Posted on Dec 13, 2009

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  • Buick Master
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Likely either a bad switch or relay. I'd also probe all fuses(regardless of what they are for) with a test light just to make sure they have power at both ends of each (takes ten minutes and eliminates the possibility that you missed something there.)

Posted on Dec 12, 2009

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1 Answer

I have a 2003 Saturn L200 2.2L Manual Drive and the heater or AC will not work no air blowing.


There is a relay that powers the blower motor circuit . Left I/P fuse box , do you know where that is ? The relay is IGN 3 relay .
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Could be the blower motor , The blower motor control switch or a blown fuse , You would need a wiring diagram to test the circuit ! Do you have a DVOM - digital volt ohm meter ! Electric Testing Techniques You Need to Know Do you know how to use A DVOM

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Test the electrical circuits ! Manual HVAC or automatic HVAC ?
Do you know the difference ? Heater / A/C blower motor electrical control diffrent . Manual has resistors an a relay for different speeds , automatic has a blower motor control module .Free wiring diagrams here http://www.bbbind.com/free-tsb Enter vehicle info year , make , model and engine size . Under system click on HVAC ,then under subsystem HVAC controls will pop up . Click the search button , then the blue links . First off you need to know what system yours has , manual or automatic.
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The air is not cool when idling, it blows warm. Also the setting 1 and 2 doesnt work, only 3 and for makes air blow.


Sounds like 2 different problems here. The ac gets warm when standing idle, is most likely the under hood fan not kicking on when ac is on. This may be a fuse issue or a relay. When ac is on, the fan should be on all the time. Relay maybe in an electrical box under the hood. Unplug the fan and test for power with a test light to see if the fan has power when ac is "on".

The inside fan not working on levels 1& 2 is likely the voltage ballast issue. this is an electrical block which controls voltage to change fan speeds. Usually found under the passenger side dash, right in the air flow comming from the fan and inside the air flow housing. Usually held in by 2 or 3 screws with a connector and 3-4 wires sticking out. this should be under $20 to buy and quite easy to change, if you can find it. Try behind glove box etc. Do not test the new one without it being in place, as it may burn out very quickly without the air flow to cool it.
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