Cooling System - Use of Recycled Engine Coolant

Number: 91-235-6B

Section: 6B

Date: MARCH 1991

Corporate Bulletin No.: 116201


Subject:
USE OF RECYCLED ENGINE COOLANT


Model and Year:
ALL PASSENGER CARS AND TRUCKS


With the current emphasis on environmental issues and disposal of waste, significant attention is being given to the recycling of engine coolant. Many coolant recycling systems are being aggressively marketed today, ranging from very complex distillation (stationary) to straightforward filtration (mobile).

As stated in previous service bulletins, General Motors does not endorse the use of recycled engine coolants in our products at this point in time. Recycling engine coolant is a very complex procedure and consequently will require a significant amount of research to determine which of the many processes is acceptable by General Motors. While we understand the growing concern being placed on (spent) engine coolant disposal, it is imperative that the quality of engine coolants being used in General Motors vehicles is not affected in any way.

General Motors is addressing the issue of recycled engine coolants for the combined benefit of our dealers, vehicle owners, and the environment. Over the next several months General Motors will conduct an experiment designed to evaluate both distillation and "on-site" recycling processes. The results of this experiment will be provided to all dealers (spring, 1991) and will outline which process(es) is acceptable to General Motors. It is essential that recycled engine coolant not be used in any General Motors products as communicated in previous bulletins.