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Monday, October 13, 2008

1999 Buick Century Heater-A/C Blower Inop

Tina asked: I have a 1999 Buick Century with auto a/c. The heater and air conditioner blower would leak water from the passenger side vent, but only leaked 3 or 4 times before the blower completely stopped working. Now the blower will not work at all. What could be the problem and how do I fix it? I can hear a clicking sound when turning on the heater and I can feel warm air coming from the vents. Could this be a resistor and which one if it is?

1 comment:

Sparky said...

Thanks for the info. In testing your problem a volt meter will be needed. With Auto a/c you have a blower motor control module instead of a blower resistor. It is located near the blower motor on the lower right side of the dash behind the glove box area. It has three wires that plug up to it in one connector and two wires that come out of it and plug up to the blower motor. Start testing by turning the key on and commanding high blower operation through the control head. Check the purple + and black - wires that plug into the blower motor. If you have about 12 volts the blower motor is faulty. If you do not have about 12 volts then you will need to check the orange+ and black- wires in the three wire connector for 12 volts. If about 12 volts are present, you will need to check the grey/black + and the black - wires for voltage ranging for near 0 volts on up to about 6 volts. If these voltages are present and there is no output to the blower motor then the blower motor control module is faulty. Three fuses that may need to be checked in the interior fuse box are the HVAC, Radio/HVAC and High Blower fuses. My gut feeling is that the blower motor is faulty due to age and your reference to water coming out of the vent. The water issue will need to be addressed or multiple failures will happen. Two thing that need to be checked are the a/c drain tube and the deflector on the cabin air filter.

I hope this info helps and please keep us informed about your repair.