For 1990-2009 cars

# DEX-COOL Coolant - New Leak Detection Dye J 46366Replaces J 29545-6

Subject: | DEX-COOL® Coolant -- New Leak Detection Dye J 46366 - Replaces J 29545-6

Models: | 1996-2008 GM Passenger Cars and Light/Medium Duty Trucks* (including Saturn)

| 1997-2008 Isuzu T-Series Medium Duty Tilt Cab Models Built in Janesville and Flint

| 1999-2008 Isuzu N-Series Medium Duty Commercial Models with 5.7L or 6.0L Gas Engine

| 2003-2008 HUMMER H2

| 2006-2008 HUMMER H3

| 2005-2008 Saab 9-7X

| *EXCLUDING 2006 and Prior Chevrolet Aveo, Epica, Optra, Vivant and Pontiac Matiz, Wave

This bulletin is being revised to include additional model years. Please discard Corporate Bulletin Number 05-06-02-002A (Section 06 - Engine/Propulsion System).

Leak detection dye, P/N 12378563 (J 29545-6) (in Canada, P/N 88900915), may cause DEX-COOL® coolant to appear green in a black vessel, making it appear to be conventional (green) coolant. This may cause a technician to add conventional coolant to a low DEX-COOL® system, thus contaminating it. The green DEX-COOL® appearance is caused by the color of the leak detection dye, which alters the color of the DEX-COOL® coolant.

A new leak detection dye, P/N 89022219 (J 46366) (in Canada, P/N 89022220), has been released that does not alter the appearance of the DEX-COOL® coolant. When adding the new leak detection dye, the color of the DEX-COOL® coolant will not change. For detecting leaks on any system that uses DEX-COOL®, leak detection dye, P/N 89022219 (in Canada, P/N 89022220), should be used. The new leak detection dye can be used with both conventional and DEX-COOL® coolant.