Eliminate the Chevy Rub

Certain 2015-2016 Chevy Express vehicles equipped with a rear HVAC system may have contact between the rear leaf spring shackle bolt and the rear HVAC coolant lines that may rub through. The rubbing creates a coolant leak that can cause the engine to overheat, as well as a loss of HVAC performance.

Information courtesy of Mitchell 1

Mike Mavrigian

Sept. 27, 2022

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Replace the shackle bolt with P/N 11588857. If required, replace the auxiliary air conditioning evaporator hoses 23172815 and 23172814, auxiliary heater inlet and outlet hose 20970677 and 20970676 (again, only if needed).

Remove and discard the original bolt. Install the new bolt and tighten first at 74 ft-lb, followed by an additional bolt rotation of 210 degrees.

Example of bolt rubbing lines.

About the Author

Information courtesy of Mitchell 1

Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.

Mike Mavrigian

Motor Age Editor

Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety of specialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.