Question about 1998 Buick LeSabre

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98 Buick Lesabre. Heat and defrost stopped working, fans are not moving.

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Hi there,

Well first of all you can check for a blown fuse as the rear defroster doesn't work either. Another thing check to make sure all the vacuum lines are connected...... if further you have the same problem then you remove heater control panel to access wires. With koke, check for B+ on the Brown/Orange wire, feeding the blower enable switch. If no voltage present, locate and repair open circuit from heater control panel to fuse.
Verify a control function such as 'heat or defrost' is commanded. Check for B+ out of the blower enable switch on the Purple/White wire and replace heater control panel as needed.
Check for B+ into the blower motor resistor on the Purple/White.
Check for B+ out of the blower motor resistor on the Orange and replace resistor as needed.
Check for B+ on the Orange at the blower motor. If present, ground the Black to see if motor runs. If not, replace blower motor (if the blower motor isn't working you will not get any air flow). Please post comments for more help or information........

Good Luck!!

Thanks

Posted on Jan 30, 2010

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Posted on Jan 02, 2017

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