Which system ?
HVAC Systems - Manual HVAC Systems - Automatic
If automatic it's probably the blower motor control processor .
Blower Motor Control Processor
The blower motor control processor is an interface between the HVAC control module and the blower motor. The blower motor speed control, Blower motor speed signal, battery positive voltage and ground circuits enable the control processor to operate. The HVAC control module sends the commanded blower motor speed to the control processor through a 0 to 12-volt linear ramped blower motor speed control circuit. As the blower motor speed control voltage increases, the blower motor speed increases. The control processor sends the actual blower speed to the control module through a 0 to 12-volt blower motor speed signal circuit. The processor supplies 12volts to the blower motor through the blower motor voltage supply circuit. The control processor uses the blower motor ground as a low side control to adjust the blower motor speed.
SOURCE: Fuel gage stuck on a 2004 Buick Rendezvous
TRY REPLACING FUEL PUMP IF IN TANK THE FUEL GAUGE GET ITS SINGAL FROM THERE
SOURCE: program a garage door opener in 2004 buick rendezvous
I cannot find the 2004, but you can buy it from the dealer. You can download the 2003 and 2005 from this link. http://www.extendedgmwarranty.com/owners-manual/buick_owner_manuals.html
SOURCE: i have 2004 buick rendezvous and the blower motor
{: ) If all other HVAC functions seem to be working normally except for the blower air, the most likely cause is a faulty blower resistor assembly ( for manual a/c) or a faulty blower motor control processor( for automatic control a/c). The blower motor can be easily checked if stucked-up or open-circuited. Inspect and repair (or replace) connectors and terminals for these components if you found them heated up or burned.
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SOURCE: blower motor not working all fuses good.2003 buick
I just replaced the blower motor resistor on my 2003 Rendezvous. I bought the resistor at the GM dealership for $48 (AC Delco). The part number was 25928168. The fan now works in all five speeds.
For electrical parts, I only trust the dealership for the latest revised components.
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