AIR Check valve - Chirping Noise

Number: 84-152

Section: 6E (VIt)

Date: June, 1984
Subject: CHIRPING NOISE FROM ENGINE COMPARTMENT AT IDLE


Model and Year: 1982-84 CHEVETTE
TO: ALL CHEVROLET DEALERS


A "chirping" noise may be experienced coming from the engine compartment area at idle. This condition may be from the A.I.R. check valve in the air supply line to the catalytic converter.

To determine if this is the case, pinch off the rubber hose between the check valve and the A.I.R. pump while the vehicle is in a fully warmed condition. If the noise stops replace with check valve, P/N 22048209.