Cooling System - Factory Use of Stop Leak

91chevy06

GMC NUMBER: 88-T-183


GROUP: 6B - Engine Cooling


DATE: February, 1989


CORPORATE
NUMBER: 866206R


SUBJECT: COOLING SYSTEM SEALANT


MODELS: 1988 C/K, R/V, S/T, G AND M MODELS


All 1988 light duty trucks built after June 1, 1988 are produced with a cooling system sealant to stop minor leaks in the
cooling system.

The addition of the sealant to the cooling system may cause the coolant to appear to have a tan or


white powdery residue in the radiator, and may cause a film to appear around the inside of the
coolant recovery reservoir. These conditions are normal and the cooling system should not be flushed to
remove the sealant.