Attachment III - Technical Information: Overview

OVERVIEW

In some of the affected vehicles, cooling system corrosion may lead to contamination of the heater core. This contamination may, over time, lead to reduced heater performance.

This service procedure is very extensive and detailed. Listed below are the sections of the service procedure along with highlights of important information.

VERIFICATION

^ Measure temperature difference in the center vents

^ If greater than 15° F (8° C), proceed to the service procedure

^ If less than 15° F (8° C), follow normal WSM diagnosis

EQUIPMENT LIST

^ Rotunda Tool Kit # 303-1525

^ Additional equipment needed

WATER PUMP INLET TUBE

^ Replace the water pump inlet tube if the engine build date is on or before 4/1/2008

^ Do NOT replace the water pump inlet tube, if the engine build date is on or after 4/2/2008

PRE-RINSE

^ Removes old coolant from the cooling system

^ Coolant MUST NOT mix with the VC-11 flush chemical

VC-11 FLUSH

^ Removes contamination from the cooling system

^ VC-11 flush chemical temperature has to be between 135° F (57° C) and 150° F (65° C) for optimum cleaning performance

POST-RINSE AND FILL

^ Removes VC-11 from the cooling system

^ VC-11 flush chemical MUST NOT mix with the new coolant

Necessary to use 5 gallons of distilled water for the final system fill