A/C - Inaccurate Control Assembly Display/Tick Noise

File In Section: 01 - HVAC

Bulletin No.: 99-01-39-005

Date: April, 1999

TECHNICAL

Subject:
HVAC Control Assembly Displays Inaccurate Temperature Setting and/or Emits Tick Noise (Replace HVAC Programmer Assembly)

Models:
1991-99 Buick Park Avenue, Ultra

This bulletin contains information on two conditions:

Condition # 1

Some customers may comment that the automatic temperature control system during vehicle warm-up may "over shoot" the requested "Set Temperature" or, under certain conditions, may allow the temperature to fall below the requested "Set Temperature".

Cause

This condition may be caused by the programmer's inability to properly regulate the temperature of the passenger compartment.

Correction # 1

1. Perform the diagnostic procedures in the HVAC-Automatic Climate Control subsection of the Service Manual.

2. Make the necessary repairs. (Use the applicable Labor Time Guide times.)

3. If the condition still exists, replace the HVAC Programmer Assembly. Refer to the HVAC Programmer replacement procedure in the HVAC-Air Conditioning sub-section of the Service Manual.

Condition # 2

Some customers may comment that the HVAC Module Assembly emits a repeating "tick-tock" or "clock" like sound.

Cause

This condition may be caused by the programmer and the actuator motor not being synchronized with each other.

Correction # 2

Replace the HVAC Programmer Assembly, P/N 9353514. Refer to the HVAC Programmer replacement procedure in the HVAC-Air Conditioning sub-section of the Service Manual.

Parts Information

Part Number Description

9353514 Heater & A/C (HVAC)
Programmer Assembly

Parts are expected to be available from GMSPO, 3/30/99.

Warranty information

For vehicles repaired under warranty, use:

Labor
Operation Description Labor Time

D0780 Programmer, A/C - Replace 0.4 hr