A/T - Procedure If ATF is Antifreeze Contaminated

Bulletin Number: 93-7-19
Reference Number: 377123
Publish Date: 6/93

Subject:
INFORMATION ON SERVICING VEHICLE WITH CONTAMINATED TRANSMISSION FLUID

Models Affected:
1993 AND PRIOR YEARS ALL MODELS WITH AUTOMATIC TRANSMISSION OR TRANSAXLE

Antifreeze contaminated trans fluid will cause friction material breakdown and seal degradation. The binder in friction material may dissolve causing material to flake off.

NOTE:
ATF contaminated with 1.2 percent glycol antifreeze or more may have a milky translucent appearance.

Just changing trans fluid is not acceptable. Friction material and seals that have been exposed to antifreeze, even for a short time, will eventually show damage. The torque converter cannot be completely drained so contamination would still be present when the remaining fluid circulates through the transmission.

If fluid is contaminated with antifreeze:

1. Locate source of leak and repair/replace radiator as needed.

2. Replace transaxle with SRTA -OR- completely overhaul (including ALL internal/external seals and friction material).

3. Replace torque converter. The torque converter may contain friction material that must be replaced.

4. Flush trans cooler as directed in Service Manual.

Trans fluid additives of any kind are not recommended by General Motors. They are not necessary and in many cases may cause damage to the transmission. Additives will void the transmission warranty.

Under no circumstance does General Motors Corporation recommend the regular and continued use of ANY supplementary additives in General Motors Automatic Transmissions.

The only way to "rejuvenate" a transmission fluid that has broken do is to replace it with new transmission fluid!

General Motors Corporation assumes responsibility for the additives selected by it to remedy specific operating problems.

General Motors Corporation cannot, and will not, accept responsibility for the many other additives which are constantly being marketed.