Engine/Transmission - Whine at 2800-3200 RPM

File In Section: 01 - HVAC

Bulletin No.: 99-01-38-003

Date: September, 1999

TECHNICAL

Subject:
Engine/Transmission Whine at 2800-3200 RPM
(Replace Heater Inlet Hose)

Models:
1997-2000 Chevrolet Cavalier
1997-2000 Pontiac Sunfire with 2.2L Engine (VIN 4 - RPO LN2)

Condition
Some customers may comment on a whine from the engine/transmission at 2800-3200 RPM.

Cause
The production released heater inlet hose has an internal coolant flow restrictor. The flow of the coolant through the restrictor may induce a whine/whistle. In some cases the flow restrictor may migrate and come in contact with the heater core inlet tube. If the restrictor comes in contact with the heater core inlet pipe the whine may become audible within the passenger compartment of the vehicle.

Correction
Replace the heater inlet hose (P/N 22615693). Use the procedure found in the HVAC section of the Service Manual. The new part has a stainless steel clamp over the hose under the insulator where the flow restrictor is positioned. If the clamp is missing on the hose, do not use. All parts currently in GMSPO stock are of the new style.

Parts Information

Part Number Description

22615693 Hose, Heater Inlet

Parts are currently available from GMSPO.

Warranty Information
For vehicles repaired under warranty, use:

Labor Operation Description Labor Time

D2774 Hose, Heater Rear Inlet 0.9 hr
(With Air Conditioning)
- Replace