For 1990-2009 cars

# SERVICE GUILD: COOLANT RECYCLING UPDATE

#### SUBJECT: COOLANT RECYCLING UPDATE (SERVICE INFORMATION)

#### VEHICLES AFFECTED: ALL MODELS, ALL YEARS

As announced in a previous bulletin, Product Service Bulletin #90-0-101, General Motors is conducting an evaluation to determine the efficiency of various engine coolant recycling processes. The objective of the evaluation is to provide recommendation(s) to our Dealers on which process(es) meets General Motors coolant specifications. Included will be both on-site equipment and off-site facility evaluations.

Due to the complexity and number of tests which are being conducted to properly evaluate each recycling process, the evaluation completion date has been delayed from spring 1991 to (mid-late) fall 1991. While General Motors realizes that these results would be helpful prior to the busy cooling service season, the integrity of the evaluation would be compromised if altered to provide the results sooner.

Presently, it is essential that recycled engine coolant not be used in any General Motors products as communicated in previous bulletins.

Dealers should delay any equipment purchase decision until evaluations are complete.

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.