Noise During Steady Throttle Between 1500-2500 Rpm (98-T-20)

NOISE DURING STEADY THROTTLE BETWEEN 1500-2500 RPM

TECHNICAL SERVICE BULLETIN

"RATTLE" OR "BUZZ" NOISE DURING STEADY THROTTLE WITH ENGINE SPEED BETWEEN 1500-2500 RPM (INSTALL HEATER CORE CLAMP KIT)

APPLICATION

Model(s): 1996-98 Saturn SC1, SC2, SL, SL1, SL2, SW1, SW2

Group/Seq. No.: HVAC - 06

Corporation No.: 881103

Bulletin No.: 98-T-20

Date: May, 1998

VEHICLES AFFECTED

1996-98 Saturns built before and including VIN WZ252356.

CONDITION

A rattle or buzz noise may be heard coming from the front of the vehicle with engine speed between 1500-2500 RPM.

CAUSE

The noise may be caused by the heater core pipes coming in contact with inside of the heater and A/C module case, or in contact with the heater pipe opening on the engine side of the dash panel assembly.

CORRECTION

Verify condition and if required install heater core clamp kit.

PROCEDURE

1. Verify the rattle or buzz noise is coming from the heater core pipes, by duplicating the condition, according to the following steps.
   1. Remove front air inlet duct assembly and air cleaner assembly. See Fig 1 .
   2. Bring engine speed up to 1500-2500 RPM.
   3. Hold the heater core pipes stationary, on the engine side of the dash panel.
      • If the rattle or buzz noise does not go away, refer to the appropriate service manual for further diagnosis.
      • If the rattle or buzz noise goes away, install heater core clamp kit using the following steps.
2. Remove screw and heater core side cover located above the accelerator pedal. See Fig 2 .
   NOTE: Heater core clamp kit contains the heater pipe clamp, fastener and the heater core retainer. The heater core retainer WILL NOT be needed for this bulletin.
3. Install heater core pipe clamp (P/N 2103031), to heater core pipes using the fastener with the kit as shown in Fig 3 . Torque: 2 N.m (16 in-lb)
4. Fasten the clamp to the inside of the heater and A/C module case using screw (P/N 11515379). Torque: 2 N.m (16 in-lb)
5. Verify the condition has been repaired.
6. Install heater core side cover. See Fig 2 .
7. Install front air inlet duct assembly and air cleaner assembly. See Fig 1 .