1999 Buick Century Q&A
1999 Buick Century Question: Hot AC
There are little doors or flaps inside the dash that control the airflow to the different vents, and the temperature of the airflow. One of these doors may be sticking, or the system that controls the doors is malfunctioning. I checked and there is a technical service bulletin about a similar problem # 02-02-39-001 I suggest taking this to a dealer and have them check this bulletin and check for others, and diagnose the problem accordingly. Condition: Some customers may comment on a temperature variation between the left and right hand ducts. Typical concerns may include that the right side of the vehicle cools down but the left stays warm or the opposite. This condition is sometimes associated by the customer with a recent service visit for other non-related repairs. The codes, DTC B0361 or B0441, may be present but will not illuminate a telltale lamp. Cause: The HVAC controller unit and the TEMP door actuator motors rely on a feedback system that supplies the controller with count values in order to accurately adjust the air temperature. When battery power is interrupted to the HVAC controller, the current actuator position values are lost. When power is restored, the controller will perform a "sweep test" of the doors from full cold to full hot and record the end values for reference. Over time, the TEMP doors may develop some flexing when run to their extremes. This flexing allows the count values to run out of range (beyond 0-255) and results in DTC code B0361 or B0441 to set. Correction: A revised HVAC controller has been released with new programming that allows for a wider tolerance - Bret Bodas
I have constant hot air coming into cabin even when ac or heater is off.also hot air on driver side only, when ac is on,passenger side gets cold.any tips on problem
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