Campaign - Engine Oil Cooler/Filter Adapter: Overview
89chevy03Number: 89C04
Section: 6A
Date: FEBRUARY, 1989
Subject: PRODUCT CAMPAIGN 89C04 ENGINE OIL COOLER/FILTER ADAPTER
Model and Year: 1988-89 K30 TRUCKS WITH 7.4L 454 CID V8 ENGINE (RPO L19, VIN CODE N) AND ENGINE OIL COOLER OPTION (RPO KC4)
TO: ALL CHEVROLET DEALERS
General Motors has determined that certain 1988-89 K30 series trucks with 7.4L V8 engine and engine oil cooler option may have oil cooler line/filter adapters that were machined incorrectly. These adapters allow oil to by-pass the engine oil cooler and/or the engine oil filter.
To correct this condition, it will be necessary to replace the engine oil cooler line/filter adapter. In addition, new oil and oil filter will be installed.