Chevrolet Workshop Service and Repair Manuals

Air Cleaner Fresh Air Duct/Hose: All Technical Service Bulletins
Engine - Reduced Performance In Warmer Climates

Number: 91-139-6C

Section: 6C

Date: December 1990

Corporate Bulletin No.: 066001

Subject:

REDUCED ENGINE PERFORMANCE

Model and Year:

ALL 1988-91 C/K TRUCKS

TO: ALL CHEVROLET DEALERS

Figure 1