For 1990-2009 cars

# INFO. ON DEX-COOL (TM) ENGINE COOLANT

#### SUBJECT: INFORMATION ON DEX-COOL(TM) ENGINE COOLANT - INFORMATION ON BACKSERVICE

#### MODELS: 1994-95 PASSENGER CARS AND TRUCKS

A NEW EXTENDED-LIFE ENGINE COOLANT CALLED DEX-COOL(TM) IS CURRENTLY BEING USED IN ALL GENERAL MOTORS' VEHICLES (EXCLUDING CHEVROLET GEO AND SATURN). REFER TO BULLETIN 53-62-01 FOR GENERAL SERVICE INFORMATION.

**BACKSERVICE**

DEX-COOL(TM) MAY BE USED IN GENERAL MOTORS VEHICLES ORIGINALLY BUILT WITH CONVENTIONAL (GREEN) COOLANT WITH THE FOLLOWING CONSIDERATIONS:

* VEHICLES ELIGIBLE FOR BACKSERVICE ARE 1994 AND 1995 MODELS (EXCLUDING 1994 J BODY WITH 4 CYLINDER ENGINES).

* THE SERVICE INTERVAL FOR DEX-COOL(TM) INTRODUCED INTO AN OLDER MODEL VEHICLE ORIGINALLY BUILT WITH "GREEN" COOLANT WILL BE 2 YEARS/30,000 MILES (50 KM) (NOT 5 YEARS/100,000 MILES (160,000 KM)).

* ALL THE "GREEN" COOLANT MUST BE REMOVED FROM THE COOLING SYSTEM BY MEANS OF A SYSTEM FLUSH. THIS MAY BE ACCOMPLISHED WITH A WATER FLUSHING DEVICE OR A GMDE WATERLESS COOLANT CHANGER (USE A UNIT DEDICATED TO "GREEN" COOLANT, NOT DEX-COOL(TM)).

#### IMPORTANT: WHEN USING A GMDE WATERLESS COOLANT CHANGER, CONDUCT THE PROCEDURE TWICE, ONCE WITH WATER, AND ONCE WITH DEX-COOL(TM).

BACKSERVICE WITH DEX-COOL(TM) IS ADVOCATED BECAUSE OF ENHANCED WATER PUMP SEAL DURABILITY EXPERIENCED WITH THIS COOLANT.

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GENERAL MOTORS BULLETINS ARE INTENDED FOR USE BY PROFESSIONAL TECHNICIANS, NOT A "DO-IT-YOURSELFER". THEY ARE WRITTEN TO INFORM THOSE TECHNICIANS OF CONDITIONS THAT MAY OCCUR ON SOME VEHICLES, OR TO PROVIDE INFORMATION THAT COULD ASSIST IN THE PROPER SERVICE OF A VEHICLE. PROPERLY TRAINED TECHNICIANS HAVE THE EQUIPMENT, TOOLS, SAFETY INSTRUCTIONS AND KNOW-HOW TO DO A JOB PROPERLY AND SAFELY. IF A CONDITION IS DESCRIBED, DO NOT ASSUME THAT THE BULLETIN APPLIES TO YOUR VEHICLE, OR THAT YOUR VEHICLE WILL HAVE THAT CONDITION. SEE A GENERAL MOTORS DEALER SERVICING YOUR BRAND OF GENERAL MOTORS VEHICLE FOR INFORMATION ON WHETHER YOUR VEHICLE MAY BENEFIT FROM THE INFORMATION.

COPYRIGHT 1995 GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.