Engine - Low Engine Idle Speed/Rough Idle
Number: 83-T-56Section: Ia
Date: June, 1983
Subject: A/C COMPRESSOR LOADING IN DEFROST MODE ON FOUR CYLINDER ENGINES - 1982-83 CELEBRITYS, CITATIONS AND CAVALIERS
A/C CIRCUIT:
TO: ALL CHEVROLET DEALERS
Low engine idle speed and rough idle can be caused by high A/C compressor 8 Cloads due to high head pressures resulting from compressor operation without engine cooling fan operation while in defrost mode.
This condition can be corrected by installing an additional engine cooling fan relay (see diagram) to operate the engine cooling fan in defrost mode.
The relay should be installed on the cowl, adjacent to the pressure cycling switch. Any wiring run through the cowl should be routed through existing grommets and care be taken to maintain cowl sealing.
MATERIALS REQUIRED
Quantity P/N Description
1 14047112 Cooling Fan Relay
1 NPN Connector Body
4 NPN Connector Terminals
WARRANTY INFORMATION
Labor Operation Number: T1094
Labor Time : .4 hour